A kind of device improving CarPlay onboard system communication performanceTechnical field
The present invention relates to onboard system technical field, be specifically related to a kind of CarPlay onboard system communication performance of improvingDevice.
Background technology
Existing vehicle entertainment system main frame manufacturer major part is all integrated with CarPlay function, and CarPlay onboard system willThe iOS device of user, iOS experience equipment and vehicle entertainment system have carried out perfect adaptation, but exploitation CarPlay appliesTime need by technical certification, as it is shown in figure 1, need at USB port B, carry out USB eye pattern test, existing CarPlay carThe limitation that loading system is shaped due to on-vehicle host scheme, such as: the driving force of USB driving chip, the way to get there of PCB circuit and lengthDegree, the quality of vehicle-carrying wire harness material and the limitation of length so that USB onboard system poor performance, carry out easily losing during USB communicationBag phenomenon, causes existing CarPlay onboard system cannot pass through CarPlay authentication test.
Summary of the invention
The present invention provides a kind of device improving CarPlay onboard system communication performance, makes CarPlay onboard system more preferableBy CarPlay authentication test.In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
The present invention provides a kind of device improving CarPlay onboard system communication performance, including uplink port, descendingLink port, low pressure difference linear voltage regulator, controllable switch, flash firmware, High-speed Control usb hub and described high speed controlThe usb host of usb hub processed connection, USB device；Described usb host, USB device respectively with uplink port, descending chainRoad port connects, and described uplink port is connected with on-vehicle host；Described High-speed Control usb hub also with can control outClose, flash firmware connects.
Further, described uplink port provides supply voltage for low pressure difference linear voltage regulator and controllable switch.
Further, described low pressure difference linear voltage regulator is for being adjusted to the supply voltage that uplink port inputs oftenSupply voltage.
Further, described low pressure difference linear voltage regulator provides often power supply for flash firmware and High-speed Control usb hubVoltage.
Further, described controllable switch controls uplink port provides supply voltage for downlink port.
Further, the magnitude of voltage of described supply voltage is 4.95～5.2V.
Further, the magnitude of voltage of described normal supply voltage is 3.2～3.4V.
Further, described High-speed Control usb hub is connected by SPI serial mode with flash firmware.
A kind of device improving CarPlay onboard system communication performance that the present invention provides, by High-speed Control USB set lineDevice improves the driving force of USB, in the CarPlay onboard system needing exploitation CarPlay application, improves CarPlayThe communication performance of onboard system, and make CarPlay onboard system can pass through CarPlay authentication requesting, carry out ATS surveyMistake is occurred without, for needing the on-vehicle host increasing CarPlay application to save development cost during examination.
Accompanying drawing explanation
Fig. 1 is existing CarPlay onboard system structural representation when carrying out CarPlay authentication test；
Fig. 2 is to add structural representation when CarPlay onboard system after apparatus of the present invention carries out CarPlay authentication test；
Fig. 3 is a kind of apparatus structure schematic diagram improving CarPlay onboard system communication performance of the present invention；
Fig. 4 is existing CarPlay onboard system USB eye pattern structural representation when testing；
USB eye pattern structural representation when Fig. 5 is to add that CarPlay onboard system is tested after apparatus of the present invention.
Detailed description of the invention
The most specifically illustrating embodiments of the present invention, accompanying drawing is only for reference and explanation uses, and it is right not constituteThe restriction of scope of patent protection of the present invention.
The present invention provides a kind of device improving CarPlay onboard system communication performance, as it is shown on figure 3, include uplinkRoad port PORT UP-STREAM (i.e. Fig. 1, USB port A) in 2, downlink port PORT DOWN-STREAM (i.e. Fig. 1,USB port B in 2), low pressure difference linear voltage regulator 3V3LOD, controllable switch SWITCH, flash firmware FLASHThe usb host USB that Firmware, High-speed Control usb hub USB84602 are connected with described High-speed Control usb hubHOST, USB device USB DEVICE；Described usb host, USB device are respectively with uplink port, downlink port evenConnecing, described uplink port is connected with on-vehicle host, transmits usb communication signal for High-speed Control usb hub；Described high speedControl usb hub to be also connected with controllable switch, flash firmware.It is descending that described controllable switch controls uplink portLink port provides 4.95～5.2V supply voltages.
Preferably, described uplink port provides 4.95～5.2V electricity for low pressure difference linear voltage regulator and controllable switchSource voltage.
Preferably, described low pressure difference linear voltage regulator is for the 4.95～5.2V supply voltages inputted by uplink portIt is adjusted to 3.2～3.4V normal supply voltages.
Preferably, described low pressure difference linear voltage regulator provides 3.2～3.4V for flash firmware and High-speed Control usb hubOften supply voltage.
Preferably, the magnitude of voltage of described supply voltage is 4.95～5.2V.
Preferably, the magnitude of voltage of described normal supply voltage is 3.2～3.4V.
Preferably, described High-speed Control usb hub is connected by SPI serial mode with flash firmware.
As in figure 2 it is shown, for needing to develop in the CarPlay onboard system that CarPlay applies, improve CarPlay vehicle-mountedThe communication performance of system, is illustrated in figure 4 USB eye pattern when existing CarPlay onboard system is tested, as shown in Figure 5For USB eye pattern when CarPlay onboard system is tested after adding apparatus of the present invention, it can be seen that after adding apparatus of the present inventionUSB eye pattern effect more effective than being not added with the USB eye pattern that apparatus of the present invention obtain so that CarPlay onboard system is more preferableBy CarPlay authentication test.
Above disclosed only presently preferred embodiments of the present invention, it is impossible to limit the rights protection model of the present invention with thisEnclose, the equivalent variations therefore made according to scope of the present invention patent, still belong to the scope that the present invention is contained.