(formula description: T)_qoutIs the current actual output torque; t is_qn-1Is the last actual output torque; t is_qnIs the calculated torque; t is the filter time)

The VCU sends a driving mode state signal to the IC through the CAN bus to be ECO; and when the SOC of the power battery is less than or equal to a certain value, the current driving mode automatically enters an ECO mode. The ECO mode drive torque Map is as shown in table 1ECO mode drive coefficient table (electric light card) and table 2ECO mode drive coefficient table (electric heavy card).

TABLE 1

TABLE 2

In the present embodiment, in NORMAL mode: adopting a single accelerator pedal MAP;

and (3) filtering algorithm:

The VCU sends a driving mode state signal NORMAL to the IC through the CAN bus.

The drive torque coefficient Map in NORMAL mode is shown in the table 3NORMAL mode drive coefficient table (electric light card) and the table 4NORMAL mode drive coefficient table (electric heavy card)

TABLE 3

TABLE 4

In the present embodiment, in the SPORT mode, an individual accelerator pedal MAP is employed;

and (3) filtering algorithm:

The chord mode torque coefficient Map is as shown in table 5 the chord mode drive coefficient table (electric light card) and table 6 the chord mode drive coefficient table (electric heavy card).

TABLE 5

TABLE 6

In the present embodiment, the section not shown in the drive coefficient table in the different driving modes is calculated by the linear difference method.

The control method of the embodiment has different requirements on the current driving torque under different operating conditions, and improves the driving experience of a user; the maximum output driving torque is adjusted in combination with the adaptability of the residual electric quantity of the power battery, so that energy conservation and environmental protection are realized; by increasing a driving torque coefficient MAP and a linear difference value method, data query in a software processing process is reduced, the operation rate is improved, and the smoothness of torque output is ensured; through setting up detailed torque filtering time and filtering algorithm in the strategy of different driving modes, the sudden change of data output is prevented, the problem of the sudden change of torque in the switching process of different modes is solved, and the stability of torque output is ensured.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A control method suitable for switching driving modes of a new energy commercial vehicle is characterized by comprising the following steps: defining an ECO mode, a NORMAL mode and a SPORT mode; the SCU outputs a driving torque coefficient of a corresponding mode to the torque module; the torque module outputs a torque request signal to an IC;

the VCU controls the switching process of three driving modes as follows:

the conditions for the transition from NORMAL mode to ECO mode are:

transition from ECO mode to NORMAL mode:

c. when the NORMAL key is pressed down, the NORMAL key is converted into a NORMAL mode;

transition from NORMAL mode to SPORT mode: the SPORT button is pressed;

conversion of the SPORT mode to the NORMAL mode: the NORMAL button is pressed;

conversion of SPORT mode to ECO mode: the ECO key is pressed down or the SOC is less than or equal to a certain value;

conversion of ECO mode to SPORT mode:

b. when the SPORT button is pressed, the mode changes into the SPORT mode.

2. The control method suitable for switching the driving modes of the new energy commercial vehicle according to claim 1, characterized in that: the certain value is 18-20%, and the threshold value range is 21-25%.

3. The control method suitable for switching the driving modes of the new energy commercial vehicle according to claim 1, characterized in that: the method for calculating the driving torque coefficient Map in the ECO mode, the NORMAL mode and the SPORT mode comprises the following steps:

setting an accelerator opening percentage as x and a driving torque coefficient percentage as y, wherein the relation between the x and the y is expressed by the following functions:

the driving torque coefficient formula in the ECO mode is: y is ax²；

The drive torque coefficient in NORMAL mode is expressed as: y is ax;

the driving torque coefficient formula in the SPORT mode is as follows: y log₁₀(ax)；

In the formula, the reference value of the coefficient a is 1.

4. The control method suitable for switching the driving modes of the new energy commercial vehicle according to claim 1, characterized in that: in the ECO mode, NORMAL mode, or SPORT mode, the torque module calculates an output torque by a filtering method, represented by:

in the formula, T_qoutFor the current actual output torque, T_qn-1For the last actual output torque, T_qnTo calculate the output torque, T is the filter time.

5. The control method suitable for switching the driving modes of the new energy commercial vehicle according to claim 1, characterized in that: in the state of charge, the VCU monitors the change in SOC value in real time.