TWI848712B

Movatterモバイル変換

Info

Publication number: TWI848712B
Application number: TW112118579A
Authority: TW
Inventors: 鄭仲瑞
Original assignee: 鄭仲瑞
Priority date: 2023-05-18
Filing date: 2023-05-18
Publication date: 2024-07-11
Also published as: TW202446666A

Abstract

本發明係一種具順暢換檔的自行車自動變速方法，係設置於具有變速系統的一自行車上，用以控制該變速系統之變速器的換檔動作，該自動變速系統包含有：一電源模組；一微電腦；一換檔驅動模組；一變速器；一踏頻感測模組，以有線或無線電性連接於該微電腦；其中該微電腦具有一換檔邏輯執行該自動變速方法，該自動變速方法以該踏頻感測模組採集到的踏頻計算踩踏速度的增減變化作為判斷鏈條張力的依據，當踩踏速度減低時適合變速；藉此本發明可具較佳順暢換檔功效。The present invention is a bicycle automatic transmission method with smooth gear shifting, which is arranged on a bicycle with a gear shifting system to control the gear shifting action of the gear shifter of the gear shifting system. The automatic transmission system includes: a power module; a microcomputer; a gear shifting drive module; a gear shifter; a pedaling frequency sensing module, which is electrically connected to the microcomputer by wire or wireless; wherein the microcomputer has a gear shifting logic to execute the automatic transmission method, and the automatic transmission method uses the pedaling frequency collected by the pedaling frequency sensing module to calculate the increase and decrease of the pedaling speed as the basis for judging the chain tension, and when the pedaling speed decreases, it is suitable to change gears; thereby, the present invention can have a better and smoother gear shifting effect.

Description

Translated fromChinese

具順暢換檔的自行車自動變速方法Bicycle automatic speed shifting method with smooth gear shifting

本發明關於一種具順暢換檔的自行車自動變速方法，主要指一種具有最佳換檔時機的方法。The present invention relates to a bicycle automatic transmission method with smooth gear shifting, mainly referring to a method with optimal gear shifting timing.

現有自行車上配置的變速器以內變速或外變速器為主，而外變速器以其重量輕、變速範圍大，而成自行車變速器的主流。外變速器變速的方式是移動變速器導向輪的位置，配合踩踏前齒輪驅動鏈條，鏈條順著導向輪的帶動，移動到與導向輪垂直的後齒輪齒片上，完成變速動作，由於變速過程為鏈條在齒盤間移動，當加速或上坡變速時，鏈條因重踩而張緊，常會產生變速困難及噪音，造成齒盤損壞及鏈條斷裂，現今手動或電驅動後撥鍊器，都是由人下達變速指令後，配合腳踩踏板，驅動鏈條變速，但往往無法在鏈條張力變小時，下達變速指令，因此無法有效掌握最佳變速時機。The transmissions currently installed on bicycles are mainly internal transmissions or external transmissions, and the external transmission has become the mainstream of bicycle transmissions due to its light weight and wide speed range. The way to change speed with an external derailleur is to move the guide wheel of the derailleur, and then step on the front gear to drive the chain. The chain moves along the guide wheel to the rear gear sprocket perpendicular to the guide wheel to complete the speed change. Since the speed change process is the chain moving between the gears, when accelerating or changing speed uphill, the chain is tightened due to heavy stepping, which often causes speed change difficulties and noise, causing gear damage and chain breakage. Nowadays, manual or electric rear derailleurs are all driven by people to change speed after issuing a speed change command, and then step on the pedal to drive the chain to change speed, but it is often impossible to issue a speed change command when the chain tension becomes smaller, so it is impossible to effectively grasp the best time to change speed.

I480204專利中以曲柄軸安裝感測器及磁鐵，這存在安裝及維護上的困難，如圖十一所示，使用上以偵測踩踏的上下死點(如虛線所示)，作為變速區間，因此造成該上、下死點位置之可變速區域較小，變速靈敏度低，尤其在上下坡因踩踏姿態改變，踩踏的上下死點也會改變，雖然可作角度補償，但路面上、下起伏變動大時仍存在參考點的不正確性，再者其以踩踏轉速值小於一預設轉速值即為變速時機，這也無法因應於上坡或起步時，踩踏轉速值偏低的騎行狀況。Patent I480204 uses a crankshaft to install sensors and magnets, which is difficult to install and maintain. As shown in Figure 11, the upper and lower dead points of pedaling are detected (as shown by the dotted line) as the speed change range, which results in a smaller speed change range at the upper and lower dead points, and low speed change sensitivity. Especially when riding uphill or downhill, the upper and lower dead points of pedaling will change due to changes in pedaling posture. Although angle compensation can be made, there is still inaccuracy in the reference point when the road surface fluctuates greatly. In addition, the speed change timing is when the pedaling speed value is less than a preset speed value, which cannot respond to riding conditions with low pedaling speed values when riding uphill or starting.

本發明之目的在提供一種可因應鏈條張力判斷換檔時機之方法。The purpose of this invention is to provide a method for determining the timing of gear shifting according to the chain tension.

本發明具順暢換檔的自行車自動變速方法係設置於具有變速系統的一自行車上，用以控制該變速系統之變速器的換檔動作，該自動變速系統包含有：一電源模組；一微電腦，電性連接於該電源模組；一換檔驅動模組，電性連接於該微電腦，受該微電腦的控制以驅動該變速器進行變速；一變速器，連接該換檔驅動模組；一踏頻感測模組或一扭力感測器，該踏頻感測模組或該扭力感測器以有線或無線電性連接於該微電腦；其中該微電腦具有一換檔邏輯執行該自動變速方法，該自動變速方法係以該踏頻感測模組採集到的踏頻計算踩踏速度的增減或該扭力感測器感測之扭力變化作為判斷鏈條張力的依據，當踩踏速度減低或扭力減低時適合變速。The present invention discloses a bicycle automatic transmission method with smooth gear shifting, which is arranged on a bicycle with a gear shifting system to control the gear shifting action of the gear shifter of the gear shifting system. The automatic gear shifting system comprises: a power module; a microcomputer electrically connected to the power module; a gear shifting driving module electrically connected to the microcomputer and controlled by the microcomputer to drive the gear shifter to shift gears; a gear shifter connected to the gear shifting driving module; a pedal A frequency sensing module or a torque sensor, the frequency sensing module or the torque sensor is electrically connected to the microcomputer by wire or wireless; wherein the microcomputer has a shifting logic to execute the automatic speed change method, the automatic speed change method uses the frequency collected by the frequency sensing module to calculate the increase or decrease of the pedaling speed or the torque change sensed by the torque sensor as the basis for judging the chain tension, and when the pedaling speed decreases or the torque decreases, it is suitable to change speed.

本發明之一實施例中由該踏頻感測模組偵測踩踏速度後次比前次高時，不適合變速，當踩踏速度後次比前次低時，適合變速。In one embodiment of the present invention, when the pedaling speed is higher than the previous one detected by the cadence sensing module, it is not suitable to change the speed, and when the pedaling speed is lower than the previous one, it is suitable to change the speed.

本發明之一實施例中具有靈敏度的調整，其靈敏度為一個可設定的踏頻變化量數值，當踏頻感測模組採集踩踏速度，傳送至微電腦，換算成踏頻的加速度，當踏頻的加速度低於靈敏度的數值時，即為適合變速區間，調整靈敏度的數值大小，即可調整變速靈敏度，該靈敏度可為零或小於零的數值。One embodiment of the present invention has sensitivity adjustment, and the sensitivity is a configurable cadence change value. When the cadence sensing module collects the pedaling speed, it is transmitted to the microcomputer and converted into cadence acceleration. When the cadence acceleration is lower than the sensitivity value, it is suitable for speed change. By adjusting the sensitivity value, the speed change sensitivity can be adjusted. The sensitivity can be zero or a value less than zero.

本發明之一實施例中該踏頻感測模組偵測前次多次踏頻的平均值大於後次踏頻適合變速，反之不適合變速。In one embodiment of the present invention, the cadence sensing module detects that if the average value of the previous multiple cadences is greater than the next cadence, it is suitable for speed change, otherwise it is not suitable for speed change.

本發明之一實施例中由該踏頻感測模組偵測前次多次踏頻的平均值大於後次多次踏頻的平均值適合變速，反之不適合變速。In one embodiment of the present invention, the cadence sensing module detects that if the average value of the previous multiple cadences is greater than the average value of the subsequent multiple cadences, it is suitable for speed change, otherwise it is not suitable for speed change.

本發明之一實施例中該扭力感測器偵測在一個時間區段的前後變化值，如果前次時間區段的扭力值大於後次時間區段的扭力值，適合變速，反之不適合變速。In one embodiment of the present invention, the torque sensor detects the change value before and after a time segment. If the torque value of the previous time segment is greater than the torque value of the next time segment, it is suitable for speed change, otherwise it is not suitable for speed change.

本發明之一實施例中該扭力感測器偵測之前次多次時間區段的扭力平均值大於後次時間區段的扭力值，適合變速，反之不適合變速。In one embodiment of the present invention, the torque sensor detects that the average torque value of the previous multiple time segments is greater than the torque value of the next time segment, which is suitable for speed change, otherwise it is not suitable for speed change.

本發明之一實施例中係該扭力感測器前次多次時間區段的扭力平均值大於後次多次時間區段的扭力平均值，適合變速，反之不適合變速。In one embodiment of the present invention, if the average torque value of the torque sensor in the previous multiple time segments is greater than the average torque value in the subsequent multiple time segments, it is suitable for speed change, otherwise it is not suitable for speed change.

本發明之換檔邏輯主要判斷鏈條張力，不受限於上、下死點才變速，可增加可變速區間並可機動調整靈敏度變速。又本發明可避免重踩加速時後齒輪組齒盤由大變小鏈條瞬間放鬆時產生踩空危險，本發明可大幅提升騎車變速順暢及安全性。The shifting logic of the present invention mainly determines the tension of the chain, and is not limited to the upper and lower dead points to change speed, which can increase the speed range and can adjust the sensitivity of the speed change. In addition, the present invention can avoid the danger of stepping on the air when the chain of the rear gear group is instantly relaxed when the gear plate changes from large to small when stepping hard on the acceleration. The present invention can greatly improve the smoothness and safety of cycling speed change.

1:自動變速系統1: Automatic transmission system

11:電源模組11: Power module

12:微電腦12: Microcomputer

13:換檔驅動模組13: Gear shift drive module

14:變速器14: Transmission

15:踏頻感測模組15: Cadence sensor module

151:感測體151:Sensor

152:感測器152:Sensor

153:外蓋153: Outer cover

16:扭力感測器16: Torque sensor

161:電連接線161: Electrical connection wire

2:後齒輪組2: Rear gear set

3:導向輪3: Guide wheel

4:鏈條4:Chain

5:張力輪5: Tension wheel

51:凸齒51: protruding teeth

6:前齒輪6:Front gear

61:凸齒61: protruding teeth

圖一係本發明之第一實施例之自行車配置示意圖。Figure 1 is a schematic diagram of the bicycle configuration of the first embodiment of the present invention.

圖二係本發明之第一實施例之自動變速系統示意圖。Figure 2 is a schematic diagram of the automatic transmission system of the first embodiment of the present invention.

圖三係本發明之第一實施例之自行車之踏頻感測模組及各齒輪配置示意圖。Figure 3 is a schematic diagram of the pedaling frequency sensing module and the configuration of each gear of the bicycle in the first embodiment of the present invention.

圖四係本發明之第一實施例之前齒輪踏頻偵測位置及對應張力輪示意圖。Figure 4 is a schematic diagram of the front gear cadence detection position and the corresponding tension wheel of the first embodiment of the present invention.

圖五係本發明之第一實施例之踏頻偵測示意圖。Figure 5 is a schematic diagram of the pedaling frequency detection of the first embodiment of the present invention.

圖六係本發明於重檔檔位時變速位置示意圖。Figure 6 is a schematic diagram of the shift position of the present invention when in a heavy gear position.

圖七係本發明於輕檔檔位時變速位置示意圖。Figure 7 is a schematic diagram of the speed change position of the present invention in a light gear position.

圖八係本發明之第一實施例之另一踏頻偵測示意圖。Figure 8 is another schematic diagram of the pedaling frequency detection of the first embodiment of the present invention.

圖九係本發明之第二實施例之自行車設置扭力感測器示意圖。Figure 9 is a schematic diagram of a bicycle equipped with a torque sensor according to the second embodiment of the present invention.

圖十係本發明之第二實施例之自動變速系統示意圖。Figure 10 is a schematic diagram of the automatic transmission system of the second embodiment of the present invention.

圖十一係習知自行車感測變速位置示意圖。Figure 11 is a schematic diagram of the speed sensing position of a familiar bicycle.

請參閱圖一~三，本發明第一實施例之自行車自動變速系統1包括一電源模組11、一微電腦12、一換檔驅動模組13、一變速器14、一踏頻感測模組15，該微電腦12電性連接該電源模組11，該換檔驅動模組13電性連接該微電腦12，並受該微電腦12的控制以驅動該變速器14進行變速；該變速器14連接該換檔驅動模組13，本實施例之變速器14設於自行車後齒輪組2下方位置，並可控制該導向輪3位置帶動鏈條4與後齒輪組2之適當齒盤接合。Please refer to Figures 1 to 3. The bicycleautomatic transmission system 1 of the first embodiment of the present invention includes apower module 11, amicrocomputer 12, a gearshift drive module 13, agear shifter 14, and a pedalingfrequency sensing module 15. Themicrocomputer 12 is electrically connected to thepower module 11, and the gearshift drive module 13 is electrically connected to themicrocomputer 12 and is controlled by themicrocomputer 12 to drive thegear shifter 14 to change speed; thegear shifter 14 is connected to the gearshift drive module 13. Thegear shifter 14 of this embodiment is located below therear gear set 2 of the bicycle, and can control the position of theguide wheel 3 to drive thechain 4 to engage with the appropriate gear of therear gear set 2.

踏頻感測模組15以有線或無線電性連接該微電腦12，本實施例之踏頻感測模組15設於該導向輪3下方之張力輪5位置，並具四個感測體151、一感測器152、一外蓋153，該感測體151具磁性並平均分佈於該張力輪5上。本實施例之張力輪5具十二個凸齒51，每間隔三個凸齒51設一感測體151，並該張力輪5旋轉一圈可由該感測器152感測取得四個信號。又本實施例之自行車前齒輪6具三十六個凸齒61，並由鏈條4與後齒輪組2、導向輪3、張力輪5連動，並該前齒輪6旋轉一圈該張力輪5可對應旋轉三圈並產生十二個信號，因此該前齒輪6旋轉移動三個凸齒61即可取得一信號。而在其他實施例中本發明亦可於張力輪5設置其他數量感測體151，例如設置十二個感測體151即可使該前齒輪6旋轉一圈取得三十六個信號，每旋轉一凸齒61即可取得一信號以取得更精確感測效果。Thecadence sensing module 15 is electrically connected to themicrocomputer 12 by wire or wireless. Thecadence sensing module 15 of this embodiment is disposed at thetension wheel 5 below theguide wheel 3 and has foursensing bodies 151, asensor 152, and anouter cover 153. The sensingbodies 151 are magnetic and evenly distributed on thetension wheel 5. Thetension wheel 5 of this embodiment has twelve protrudingteeth 51, and asensing body 151 is disposed every three protrudingteeth 51. When thetension wheel 5 rotates one circle, four signals can be sensed by thesensor 152. In the present embodiment, thefront gear 6 of the bicycle has thirty-sixcams 61, and is linked by thechain 4 with the rear gear set 2, theguide wheel 3, and thetension wheel 5. When thefront gear 6 rotates one circle, thetension wheel 5 can rotate three circles and generate twelve signals. Therefore, when thefront gear 6 rotates and moves threecams 61, a signal can be obtained. In other embodiments, the present invention can also set other number ofsensors 151 on thetension wheel 5. For example, setting twelvesensors 151 can make thefront gear 6 rotate one circle and obtain thirty-six signals. Each time acam 61 rotates, a signal can be obtained to obtain a more accurate sensing effect.

本發明之微電腦12內建一換檔邏輯，主要針對踩踏速度的增減作為判斷鏈條4張力的依據，當踩踏速度後次比前次高時表示踩踏者正在加速或在施力區施力，此時鏈條4張力較大，不適合變速，當踩踏速度比前一次低時表示踩踏者正在減速或在上、下死點，此時鏈條4張力較小，適合變速。Themicrocomputer 12 of the present invention has a built-in shift logic, which mainly uses the increase or decrease of the pedaling speed as the basis for judging the tension of thechain 4. When the pedaling speed is higher than the previous one, it means that the pedaler is accelerating or applying force in the force application area. At this time, the tension of thechain 4 is large and it is not suitable for speed change. When the pedaling speed is lower than the previous one, it means that the pedaler is decelerating or at the upper or lower dead point. At this time, the tension of thechain 4 is small and it is suitable for speed change.

請參閱圖三、四，本實施例之前齒輪6之凸齒61可對應每三齒具一感測間隔，每相鄰感測間隔分別具t0~t11轉速時間，又該前齒輪6旋轉一圈時該張力輪5上之感測體151可分別產生對應信號，並如圖式中該上、下t0、t6位置為踩踏者不易施力踩踏之上、下死點，該自行車踏板位移至相鄰t0、t6上、下死點位置時一般為轉速及鏈條4張力小位置，適合變速。Please refer to Figures 3 and 4. In this embodiment, theconvex teeth 61 of thefront gear 6 can correspond to a sensing interval for every three teeth, and each adjacent sensing interval has a rotation speed time of t0~t11. When thefront gear 6 rotates one circle, thesensor 151 on thetension wheel 5 can generate corresponding signals respectively. As shown in the figure, the upper and lower t0 and t6 positions are the upper and lower dead points where the pedaler is not easy to exert force. When the bicycle pedal moves to the upper and lower dead point positions adjacent to t0 and t6, the rotation speed and the tension of thechain 4 are generally small, which is suitable for speed change.

請參閱圖三、五，本發明亦可於其他位置變速，當踏頻感測模組15感測t4位置時其踩踏轉速(踏頻)較前次t3之踩踏轉速低，此時鏈條4張力小，適合變速，又該t2踩踏轉速較前次t1踩踏轉速高，表示正在加速該鏈條4張力較大，不適合變速。又本實施例中t5位置及該上、下死點t0、t6位置轉速低亦可適合變速。Please refer to Figures 3 and 5. The present invention can also change speed at other positions. When the pedaling speed (pedaling frequency) of the t4 position is sensed by thecadence sensing module 15, it is lower than the pedaling speed of the previous t3. At this time, the tension of thechain 4 is small, which is suitable for speed change. The pedaling speed of t2 is higher than the pedaling speed of the previous t1, which means that the tension of thechain 4 is large during acceleration and is not suitable for speed change. In this embodiment, the t5 position and the upper and lower dead points t0 and t6 positions have low speeds and are also suitable for speed change.

因此如圖四、六所示，當循環踩踏過程因先加速後通過前齒輪6上、下死點不易施力位置又將減速，因此產生連續類似正弦波波形，而本發明於自行車行經上坡重檔檔位時雖然位於踏頻高位區域，但仍可於圓框顯示踩踏減速位置進行順暢變速換檔，並非只能於波谷位置換檔。又如圖七所示，本發明於自行車行經平路或下坡輕檔檔位時雖然位於踏頻低位區域，但仍可於圓框顯示踩踏減速位置順暢換檔，並非只能於波谷位置換檔。Therefore, as shown in Figures 4 and 6, when the cyclic pedaling process first accelerates and then passes through the upper and lower dead points of thefront gear 6 where it is difficult to apply force, it will decelerate again, thus generating a continuous waveform similar to a sine wave. Although the present invention is in a high-cadence area when the bicycle is traveling through an uphill heavy gear, it can still smoothly shift gears at the pedaling deceleration position displayed in the circular frame, and it is not only possible to shift gears at the trough position. As shown in Figure 7, although the present invention is in a low-cadence area when the bicycle is traveling through a flat road or a downhill light gear, it can still smoothly shift gears at the pedaling deceleration position displayed in the circular frame, and it is not only possible to shift gears at the trough position.

本發明變速區間不侷限於前齒輪6上、下死點位置，本發明亦可於前齒輪6其他位置機動靈敏變速，可提升變速靈活性，又本發明可避免重踩加速時鏈條4於後齒輪組2由大變小瞬間放鬆時產生踩空危險，本發明可大幅提升騎車變速順暢體驗及安全功效。The speed change range of the present invention is not limited to the upper and lower dead points of thefront gear 6. The present invention can also be used to flexibly change speeds at other positions of thefront gear 6, which can improve the flexibility of speed change. The present invention can also avoid the danger of stepping on the air when thechain 4 is released at the moment when the rear gear set 2 changes from large to small when stepping hard on the acceleration. The present invention can greatly improve the smooth speed change experience and safety effect of riding a bicycle.

本發明之換檔邏輯可具靈敏度調整，其中本發明可於踩踏加速度負值低於設定值時表示鏈條4放鬆程度愈大可適合變速，若踩踏加速度負值高於設定值時鏈條4因未明顯放鬆，此時不變速以維持變速更佳穩定性。The shifting logic of the present invention can be adjusted with sensitivity. When the negative value of the pedaling acceleration is lower than the set value, the present invention can indicate that thechain 4 is more relaxed and suitable for shifting. If the negative value of the pedaling acceleration is higher than the set value, thechain 4 is not significantly relaxed, so the gear will not be changed to maintain better stability of the shifting.

如圖三、八所示，如本實施例之換檔邏輯設置為須低於前一次踏頻5%的踏頻速度減小變化量才能變速，其中踏頻感測模組15感測t10位置踏頻若為58RPM較前一次t9踏頻60RPM低時雖然鏈條4張力為減小狀態，但其踏頻變化為-2RPM未低於設定變化的負值範圍，此時換檔邏輯判斷仍不變速。如本實施例之換檔邏輯，須其踏頻變化量(-3RPM)才能變速，因此因該t10位置之鏈條4張力變化不明顯，此時不變速可提升變速動作穩定性。As shown in Figures 3 and 8, if the shifting logic of this embodiment is set to a treadmill speed change of 5% lower than the previous treadmill speed, thetreadmill sensing module 15 senses that the treadmill speed at position t10 is 58RPM, which is lower than the previous t9 treadmill speed of 60RPM. Although the tension of thechain 4 is in a reduced state, the treadmill speed change is -2RPM, which is not lower than the negative value range of the set change. At this time, the shifting logic determines that the speed will not be changed. For example, the shifting logic of this embodiment requires a treadmill speed change (-3RPM) to change the speed. Therefore, since thechain 4 tension change at the t10 position is not obvious, not changing the speed at this time can improve the stability of the shifting action.

本發明之換檔邏輯可判斷前、後踏頻可以是前次多次的平均值與後次踏頻比對，若前次多次踏頻的平均值大於後次踏頻表示踏頻「趨勢」正在降低，此時鏈條4張力較小，適合變速，反之鏈條4張力變大不適合變速。如圖八所示(t3踏頻+t4踏頻)/2之平均踏頻大於t5踏頻，該t5時間適合變速；又(t7踏頻+t8踏頻)/2之平均踏頻小於t9踏頻，顯示踏頻趨勢上升，該t9時間不適合變速。The shifting logic of the present invention can judge the previous and subsequent cadences by comparing the average of the previous multiple cadences with the subsequent cadence. If the average of the previous multiple cadences is greater than the subsequent cadence, it means that the cadence "trend" is decreasing. At this time, the tension of thechain 4 is smaller, which is suitable for speed change. On the contrary, the tension of thechain 4 becomes larger and is not suitable for speed change. As shown in Figure 8, the average cadence of (t3 cadence + t4 cadence)/2 is greater than the t5 cadence, and the t5 time is suitable for speed change; and the average cadence of (t7 cadence + t8 cadence)/2 is less than the t9 cadence, indicating that the cadence trend is increasing, and the t9 time is not suitable for speed change.

本發明之換檔邏輯可以是前次多次踏頻的平均值與後次多次踏頻之平均值比對判斷，如果前次多次踏頻之平均值大於後次多次踏頻之平均值表示平均踏頻正在降低，此時鏈條4張力較小適合變速，反之鏈條4張力較大，不適合變速。並且前次平均值的取樣數量亦可大於後次平均值取樣數量以易於顯示前次至後次之趨勢，如圖八所示(t2踏頻+t3踏頻+t4踏頻)/3之前次平均踏頻大於(t5踏頻+t6踏頻)/2之後次平均踏頻，此時鏈條4張力趨勢變小，於t6時間適合變速，又(t6踏頻+t7踏頻+t8踏頻)/3之前次平均踏頻小於(t9踏頻+t10踏頻)/2之後次平均踏頻，此時表示鏈條4張力趨勢變大，不適合變速。The shifting logic of the present invention can be a comparison and judgment of the average value of the previous multiple pedaling frequencies and the average value of the subsequent multiple pedaling frequencies. If the average value of the previous multiple pedaling frequencies is greater than the average value of the subsequent multiple pedaling frequencies, it means that the average pedaling frequency is decreasing. At this time, the tension of thechain 4 is relatively small and it is suitable for shifting. Otherwise, the tension of thechain 4 is relatively large and it is not suitable for shifting. In addition, the number of samples of the previous average value can be greater than the number of samples of the next average value to easily display the trend from the previous to the next. As shown in Figure 8, the average cadence of the previous time (t2 cadence + t3 cadence + t4 cadence)/3 is greater than the average cadence of the next time (t5 cadence + t6 cadence)/2. At this time, the tension of thechain 4 tends to decrease, and it is suitable to change speed at time t6. In addition, the average cadence of the previous time (t6 cadence + t7 cadence + t8 cadence)/3 is less than the average cadence of the next time (t9 cadence + t10 cadence)/2. At this time, it means that the tension of thechain 4 tends to increase, and it is not suitable to change speed.

請參閱圖九、十係本發明之第二實施例，該第二實施例與第一實施例皆感測鏈條4張力，並其主要差異在第二實施例之自動變速系統1於自行車五通管位置設置扭力感測器16，該扭力感測器16以有線或無線電性連接微電腦12，本實施例設置一電連接線161連接微電腦12並感測前齒輪6踩踏扭力輸入微電腦12，而該扭力感測器16為習知結構不再予多述。Please refer to Figures 9 and 10 for the second embodiment of the present invention. Both the second embodiment and the first embodiment sense the tension of thechain 4, and the main difference is that theautomatic transmission system 1 of the second embodiment is provided with atorque sensor 16 at the position of the bicycle bottom bracket, and thetorque sensor 16 is electrically connected to themicrocomputer 12 by wire or wireless. The present embodiment is provided with anelectrical connection line 161 connected to themicrocomputer 12 and senses the pedaling torque of thefront gear 6 and inputs it into themicrocomputer 12, and thetorque sensor 16 is a known structure and will not be described in detail.

本發明之換檔邏輯可判斷該扭力感測器16在一個時間區段的前後變化值，如果前次時間區段的扭力值大於後次時間區段的扭力值，表示鏈條4張力正在變小，適合變速，反之鏈條4張力在變大，不適合變速。The shifting logic of the present invention can determine the change value of thetorque sensor 16 before and after a time segment. If the torque value of the previous time segment is greater than the torque value of the next time segment, it means that the tension of thechain 4 is decreasing and it is suitable for speed change. Otherwise, the tension of thechain 4 is increasing and it is not suitable for speed change.

本發明之換檔邏輯可以是判斷扭力感測器16在多個時間區段的前、後變化值，如果前次多次時間區段的扭力平均值大於後次一段區段的扭力值，表示此時鏈條4張力趨勢正在變小，適合變速，反之鏈條4張力在變大，不適合變速。The shifting logic of the present invention can be to judge the change value of thetorque sensor 16 before and after multiple time segments. If the average value of the torque in the previous multiple time segments is greater than the torque value in the next segment, it means that the tension trend of thechain 4 is decreasing at this time, which is suitable for speed change. Otherwise, the tension of thechain 4 is increasing, which is not suitable for speed change.

本發明之換檔邏輯可以是判斷扭力感測器16在多個時間區段的前、後變化值，如果前次多次時間區段的扭力平均值大於後次多次時間區段的平均扭力值，表示此時鏈條4張力趨勢正在變小，適合變速，反之鏈條4張力在變大不適合變速。而本實施例前次平均值的取樣數量可大於後次平均值的取樣數量以易於顯示前次至後次之趨勢。The shifting logic of the present invention can be to judge the change value of thetorque sensor 16 before and after multiple time segments. If the average value of the torque in the previous multiple time segments is greater than the average value of the torque in the next multiple time segments, it means that the tension of thechain 4 is decreasing and it is suitable for speed change. On the contrary, the tension of thechain 4 is increasing and it is not suitable for speed change. In this embodiment, the sampling number of the previous average value can be greater than the sampling number of the next average value to easily display the trend from the previous time to the next time.

綜結前述，本發明之換檔邏輯配合第一或第二實施例可智慧判斷鏈條張力減小時即可變速，可大幅提升變速區間，並可判定鏈條張力增減趨勢，可提升變速過程更為順暢及防止踏空提升安全性，並前述實施例為本發明例示，並非本發明限制，凡依據本發明精神所為之等效改變亦應屬於本發明範疇內。In summary, the shifting logic of the present invention in combination with the first or second embodiment can intelligently determine that the gear can be shifted when the chain tension decreases, which can greatly increase the gear shifting range and determine the increase and decrease trend of the chain tension, which can make the gear shifting process smoother and prevent stepping into the air to improve safety. The aforementioned embodiments are illustrative of the present invention and are not limited to the present invention. Any equivalent changes made according to the spirit of the present invention should also fall within the scope of the present invention.