An electric commercial vehicle power control system and method

Abstract

The application provides an electric commercial vehicle power control system and method, relates to the technical field of electric commercial vehicle power control, and comprises a whole vehicle DCDC converter, a low-voltage power control circuit and a high-voltage power supply circuit. The whole vehicle DCDC converter is connected with the low-voltage power control circuit. The whole vehicle DCDC converter is activated under negative control after the control signal ground of the whole vehicle DCDC converter. The low-voltage power control circuit is driven to control the on-off state and charging function of the whole vehicle through gear switching. The high-voltage power supply circuit is connected with the whole vehicle DCDC converter in parallel, and the high-voltage power supply circuit supplies high voltage for the whole vehicle DCDC converter. The application cancels the low-voltage storage battery for starting, reduces the whole vehicle cost and the failure rate of the low-voltage storage battery, and improves the whole vehicle power control efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of electric power control for electric commercial vehicles, and particularly to an electric power control system and method for electric commercial vehicles. Background Technology

[0002] Electric commercial vehicles refer to vehicles that use electric drive systems and are specifically designed for commercial operation and delivery services. Due to their energy-saving and environmentally friendly advantages, electric commercial vehicles are widely used in urban logistics and engineering operations. With the widespread adoption of electric commercial vehicles, people's understanding of the working principles and technical details of electric vehicles is becoming increasingly in-depth, and electric commercial vehicles have become an important means of transportation in people's lives.

[0003] Currently, the power control system of most electric commercial vehicles typically includes a power battery and a low-voltage battery for starting. These two types of batteries each play an important role in the overall vehicle power control. The power battery provides power to the electric commercial vehicle, while the low-voltage battery is a key component of the electric commercial vehicle. Its main task is to provide enough power to start the vehicle's electronic systems and motors. Once the electric commercial vehicle starts successfully, the power demand of the entire vehicle is met by the DC-DC converter (DCDC), and the low-voltage battery will also begin to charge. Existing technology discloses an on-board control device, including a power failure detection circuit and a first diode. The power failure detection circuit is connected to the negative terminal of the first diode, and the positive terminal of the first diode is connected to an on-board power consumption module. The power failure detection circuit is used to detect the power failure of the main power of the on-board battery, send power failure information to the hardware platform system module, and send the power failure information to the on-board power consumption module through the first diode. However, the power failure detection circuit of this control device is also connected to the on-board battery, which increases the overall vehicle cost. Moreover, the on-board battery is a low-voltage storage battery used for starting, which is prone to discharge failure, resulting in low overall vehicle power control efficiency. Summary of the Invention

[0004] To address the issues of high cost and frequent low-voltage battery failures in current vehicle control systems, which lead to low overall vehicle power control efficiency, this invention proposes an electric commercial vehicle power control system and method that eliminates the need for a low-voltage battery for starting. By reducing overall vehicle cost and the low-voltage battery failure rate, this invention improves overall vehicle power control efficiency.

[0005] To achieve the above-mentioned technical effects, the technical solution of the present invention is as follows:

[0006] An electric commercial vehicle power control system includes: a vehicle DC-DC converter, a low-voltage power control circuit, and a high-voltage power supply circuit. The vehicle DC-DC converter is connected to the low-voltage power control circuit. The vehicle DC-DC converter is activated by negative control after its control signal is grounded. It controls the vehicle's power-on / off state and charging function by driving the low-voltage power control circuit to switch gears. The high-voltage power supply circuit is connected in parallel with the vehicle DC-DC converter and supplies high voltage to the vehicle DC-DC converter.

[0007] Preferably, the low-voltage power control circuit includes a gear shifting circuit, a vehicle controller, a battery management system module, and a high-voltage adapter system module. The output terminal of the vehicle DC-DC converter is connected to the input terminal of the low-voltage power control circuit, and the output terminal of the low-voltage power control circuit is connected to the input terminal of the vehicle DC-DC converter. The vehicle controller, the battery management system module, and the high-voltage adapter system module are connected in parallel with the gear shifting circuit.

[0008] Preferably, the gear positions include an OFF position, an ACC position, an ON position, and a start position.

[0009] Preferably, the gear shifting circuit includes a first fuse, a main power switch relay, a charging and ACC conversion relay, a charging socket, an ignition lock, and an ON position relay. The vehicle DC-DC converter is connected to one end of the first fuse. The other end of the first fuse is connected to the common point of the main power switch relay and one end of the control coil of the main power switch relay. The other end of the control coil of the main power switch relay is connected to the input terminal of the vehicle controller and the common point of the charging and ACC conversion relay. The normally closed contact of the charging and ACC conversion relay is connected to the ACC pin of the ignition lock. The IG pin and B pin of the ignition lock are grounded together. The B pin of the ignition lock is also connected to the neutral terminal of the charging socket, the normally open contact of the charging and ACC conversion relay, and one end of the control coil of the charging and ACC conversion relay. The charging and ACC conversion relay... The other end of the control coil is connected to the live wire of the charging socket. The normally open contact of the main power switch relay is connected to the B pin of the ignition lock and the common point of the ON position relay. One end of the control coil of the ON position relay is grounded, and the other end of the control coil of the ON position relay is connected to the IG pin of the ignition lock. The normally open contact of the ON position relay is connected to one end of the vehicle controller, the battery management system module, and the high-voltage adapter system module. The other ends of the vehicle controller, the battery management system module, and the high-voltage adapter system module are connected to the normally open contact of the main power switch relay. The vehicle controller, the battery management system module, and the high-voltage adapter system module are all connected to the ground wire. The vehicle controller is also connected to the ST pin of the ignition lock. The vehicle DC-DC converter is also connected to the vehicle controller, the battery management system module, and the high-voltage adapter system module through the vehicle CAN line.

[0010] Preferably, the high-voltage power supply circuit includes a power battery, a second fuse, a main circuit breaker, an insulation detection module, a charging switch circuit, an auxiliary drive power distribution module for managing and distributing auxiliary power to the electric commercial vehicle, and a main drive power distribution module for managing and distributing high-voltage power to the electric commercial vehicle. The positive terminal of the power battery is connected to one end of the second fuse and one end of the main circuit breaker, respectively. The other end of the second fuse is connected to one end of the vehicle's DC-DC converter. The other end of the vehicle's DC-DC converter is connected to the negative terminal of the power battery and one end of the insulation detection module, respectively. The other end of the insulation detection module is connected to the second fuse. The charging switch circuit, the auxiliary drive power distribution module, and the main drive power distribution module are connected in parallel with the insulation detection module.

[0011] Preferably, the charging switch circuit includes a charging contactor and a third fuse connected in series, the auxiliary drive power distribution module includes a PTC thermistor power distribution circuit, an air conditioning power distribution circuit, and an auxiliary power distribution circuit connected in parallel, the PTC thermistor power distribution circuit includes a first push-button switch, a fourth fuse, and a PTC thermistor connected in series, and the air conditioning power distribution circuit includes a second push-button switch, a fifth fuse, and an air conditioner connected in series.

[0012] Preferably, the auxiliary power distribution circuit includes a third push-button switch, a sixth fuse, a seventh fuse, a powertrain configuration unit, and an electric power steering system unit. The sixth fuse and the powertrain configuration unit are connected in series to form a first branch, and the seventh fuse and the electric power steering system unit are connected in series to form a second branch. The first branch and the second branch are connected in parallel and then connected in series with the third push-button switch.

[0013] Preferably, the main drive power distribution module includes a fourth push-button switch, a fifth push-button switch, an eighth fuse, a ninth fuse, and a main control unit. One end of the fourth push-button switch is connected to one end of the main circuit breaker and one end of the fifth push-button switch. The other end of the fifth push-button switch is connected to one end of the eighth fuse. The other end of the eighth fuse is connected to the other end of the fourth push-button switch and one end of the ninth fuse. The other end of the ninth fuse is connected to one end of the main control unit. The other end of the main control unit is connected to the negative terminal of the power battery.

[0014] Preferably, the process of controlling the vehicle's power-on / off state and charging function by switching the gears of the low-voltage power control circuit includes switching from OFF to ACC, from ACC to ON, and from ON to start. The specific process is as follows:

[0015] When the OFF position is switched to the ACC position, the ACC signal of the ignition lock is connected to the ground wire through the B pin, and transmitted to the vehicle DC-DC converter through the charging and ACC conversion relay. The vehicle DC-DC converter receives the ACC signal and starts working, and the ACC position is successfully powered on.

[0016] When the ACC position is switched to the ON position, the IG signal of the ignition lock is connected to the ACC power phase through the B pin to obtain a high-level signal. The ON position relay receives the high-level signal and is energized, and the ON position is successfully powered on.

[0017] When the ON position is switched to the start position, the ST signal of the ignition lock is connected to the ACC power phase through the B pin to obtain a high-level signal. The high-level signal is transmitted to the main control unit, which controls the drive power distribution module to distribute power, and the vehicle starts successfully.

[0018] The process of switching gears when the vehicle is powered off includes switching from ON to ACC and switching from ACC to OFF. The specific process is as follows:

[0019] When the ON position is switched to the ACC position, the IG pin and B pin of the ignition lock are disconnected, the ON position relay is disconnected, the ON position signal is lost, the vehicle DC-DC converter is connected to the vehicle controller, battery management system module and high voltage adapter system module through the vehicle CAN line to exchange information, the vehicle is powered down normally, and the ON position is powered down successfully.

[0020] When the ACC gear is switched to the OFF gear, the ACC signal of the ignition lock is disconnected from the ground wire through the B pin. The vehicle DC-DC converter receives the delayed power-down signal in the vehicle CAN line network. The vehicle DC-DC converter is powered off after a delay to store and record normal vehicle data. The ACC gear is successfully powered off.

[0021] The charging process is as follows:

[0022] When the charging socket is connected to an external power source, the charging and ACC conversion relays receive the external power signal and engage. The vehicle's DC-DC converter receives the grounded negative control signal and begins to work, supplying ACC power to the vehicle controller, battery management system module, and high-voltage adapter system module. The charging CAN signal in the vehicle's CAN bus network activates the vehicle controller, battery management system module, and high-voltage adapter system module. The vehicle is also charged through the charging switch circuit in the high-voltage power supply circuit.

[0023] This invention also proposes a power control method for electric commercial vehicles, comprising the following steps:

[0024] S1. Connect the vehicle's DC-DC converter to the low-voltage power control circuit;

[0025] S2. Ground the control signal of the vehicle DC-DC converter, activate the vehicle DC-DC converter under negative control, and drive the low-voltage power control circuit to switch gears to control the vehicle's power-on / off status and charging function;

[0026] S3. Connect the high-voltage power supply circuit in parallel with the vehicle DC-DC converter, and use the high-voltage power supply circuit to supply high voltage to the vehicle DC-DC converter.

[0027] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0028] This invention proposes a power control system and method for electric commercial vehicles. First, the vehicle's DC-DC converter is connected to a low-voltage power control circuit. Then, after the control signal of the vehicle's DC-DC converter is grounded, the negative control of the converter is activated. This solves the problem that the vehicle lacks a low-voltage battery, making it impossible to control components through positive control. The vehicle's DC-DC converter controls the vehicle's power-on / off status and charging function by driving the low-voltage power control circuit to meet the vehicle's normal power-on / off requirements. A high-voltage power supply circuit is connected in parallel with the vehicle's DC-DC converter, providing high voltage for its operation. This invention eliminates the need for a low-voltage starting battery, reducing vehicle costs and the low-voltage battery failure rate, thus improving the overall vehicle power control efficiency. Attached Figure Description

[0029] Figure 1 This diagram illustrates the structure of an electric commercial vehicle power control system proposed in an embodiment of the present invention.

[0030] Figure 2 This diagram illustrates the structure of the low-voltage power control circuit proposed in this embodiment of the invention.

[0031] Figure 3 This diagram illustrates the structure of the high-voltage power supply circuit proposed in this embodiment of the invention.

[0032] Figure 4 A flowchart illustrating an electric commercial vehicle power control method proposed in an embodiment of the present invention;

[0033] 1. Vehicle DC-DC converter; 2. Low-voltage power control circuit; 2.1 Gear shifting circuit; 2.1.1 First fuse; 2.1.2 Main power switch relay; 2.1.3 Charging and ACC conversion relay; 2.1.4 Charging socket; 2.1.5 Ignition lock; 2.1.6 ON position relay; 2.2 Vehicle controller; 2.3 Battery management system module; 2.4 High-voltage adapter system module; 3.3 High-voltage power supply circuit; 3.1 Power battery; 3.2 Second fuse; 3.3 Main circuit breaker; 3.4 Insulation detection module; 3.5 Charging switch circuit; 3.5.1 Charging contactor; 3.5.2 Third fuse; 3.6 Auxiliary drive power distribution module; 3.6.1 PTC thermistor power distribution. Circuit; 3611 First push-button switch, 3612 Fourth fuse; 3613 PTC thermistor; 362 Air conditioning power distribution circuit; 3621 Second push-button switch; 3622 Fifth fuse; 3623 Air conditioning; 363 Auxiliary power distribution circuit; 3631 Third push-button switch, 3632 Sixth fuse, 3633 Seventh fuse; 3634 Powertrain configuration unit; 3635 Electric power steering system unit; 37 Main drive power distribution module; 371 Fourth push-button switch; 372 Fifth push-button switch; 373 Eighth fuse; 374 Ninth fuse; 375 Main control unit; 4 Vehicle CAN bus. Detailed Implementation

[0034] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention.

[0035] To better illustrate this embodiment, some parts of the accompanying drawings may be omitted, enlarged, or reduced, and do not represent actual dimensions. The descriptions of directions such as "up" and "down" are not intended to limit the invention.

[0036] It is understandable to those skilled in the art that some well-known details may be omitted from the accompanying drawings;

[0037] The positional relationships depicted in the accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention.

[0038] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] Example 1

[0040] like Figure 1 As shown in the figure, this embodiment proposes an electric commercial vehicle power control system. The system includes: a vehicle DC-DC converter 1, a low-voltage power control circuit 2, and a high-voltage power supply circuit 3. The vehicle DC-DC converter 1 is connected to the low-voltage power control circuit 2. The vehicle DC-DC converter 1 is activated by negative control after the control signal of the vehicle DC-DC converter 1 is grounded. It controls the power-on / off state and charging function of the vehicle by driving the gear switching of the low-voltage power control circuit 2. The high-voltage power supply circuit 3 is connected in parallel with the vehicle DC-DC converter 2 and supplies high voltage to the vehicle DC-DC converter 2.

[0041] See Figure 2The low-voltage power control circuit 2 includes a gear shifting circuit 21, a vehicle controller 22, a battery management system module 23, and a high-voltage adapter system module 24. The output terminal of the vehicle DC-DC converter 1 is connected to the input terminal of the low-voltage power control circuit 2, and the output terminal of the low-voltage power control circuit 2 is connected to the input terminal of the vehicle DC-DC converter 1. The vehicle controller 22, battery management system module 23, and high-voltage adapter system module 24 are connected in parallel with the gear shifting circuit 21. The gears include OFF, ACC, ON, and start. The gear shifting circuit 21 includes a first fuse 211 and a main power switch relay. Electrical component 212, charging and ACC conversion relay 213, charging socket 214, ignition lock 215, and ON position relay 216. The vehicle DC-DC converter 1 is connected to one end of the first fuse 211. The other end of the first fuse 211 is connected to the common point of the main power switch relay 212 and one end of the control coil of the main power switch relay 212. The other end of the control coil of the main power switch relay 212 is connected to the input terminal of the vehicle controller 22 and the common point of the charging and ACC conversion relay 213. The normally closed contact of the charging and ACC conversion relay 213 is connected to the ACC pin of the ignition lock 215. The IG1 and B1 pins of the ignition lock 215 are grounded together. The B1 pin of the ignition lock 215 is also connected to the neutral terminal of the charging socket, the normally open contact of the charging and ACC conversion relay 213, and one end of the control coil of the charging and ACC conversion relay 213. The other end of the control coil of the charging and ACC conversion relay 213 is connected to the live wire terminal of the charging socket. The normally open contact of the main power switch relay 212 is connected to the common point of the B2 pin of the ignition lock 215 and the ON position relay 216. One end of the control coil of the ON position relay 216 is grounded, and the other end of the control coil of the ON position relay 216 is connected to the IG2 pin of the ignition lock 215. The normally open contacts of the switch relay 216 are connected to one end of the vehicle controller 22, the battery management system module 23, and the high-voltage adapter system module 24, respectively. The other ends of the vehicle controller 22, the battery management system module 23, and the high-voltage adapter system module 24 are connected to the normally open contacts of the main power switch relay 212. The vehicle controller 22, the battery management system module 23, and the high-voltage adapter system module 24 are connected to the ground wire. The vehicle controller 22 is also connected to the ST pin of the ignition lock 215. The vehicle DC-DC converter 2 is also connected to the vehicle controller 22, the battery management system module 23, and the high-voltage adapter system module 24 through the vehicle CAN line 4.

[0042] In this embodiment, the vehicle DC-DC converter is first connected to the low-voltage power control circuit. Then, after the control signal of the vehicle DC-DC converter is grounded, the negative control of the vehicle DC-DC converter is activated. This solves the problem that the vehicle cannot control the components through positive control because there is no low-voltage battery in the vehicle. The vehicle DC-DC converter controls the vehicle's power-on / off status and charging function by driving the gear switching of the low-voltage power control circuit, thus meeting the normal power-on / off requirements of the vehicle. The high-voltage power supply circuit is connected in parallel with the vehicle DC-DC converter. The high-voltage power supply circuit can operate by supplying high voltage to the vehicle DC-DC converter. This invention eliminates the need for a low-voltage battery for starting, thereby reducing the overall vehicle cost and the failure rate of the low-voltage battery, and improving the efficiency of the vehicle's power control.

[0043] Example 2

[0044] See Figure 3 The high-voltage power supply circuit 3 includes a power battery 31, a second fuse 32, a main circuit breaker 33, an insulation detection module 34, a charging switch circuit 35, an auxiliary drive power distribution module 36 for managing and distributing auxiliary power to the electric commercial vehicle, and a main drive power distribution module 37 for managing and distributing high-voltage power to the electric commercial vehicle. The positive terminal of the power battery 31 is connected to one end of the second fuse 32 and the main circuit breaker 33, respectively. The other end of the second fuse 32 is connected to one end of the vehicle's DC-DC converter. The other end of the vehicle's DC-DC converter is connected to the negative terminal of the power battery and one end of the insulation detection module 34, respectively. The other end of the insulation detection module 34 is connected to the second fuse 32. The charging switch circuit 35, the auxiliary drive power distribution module 36, and the main drive power distribution module 37 are connected in parallel with the insulation detection module 34.

[0045] The charging switch circuit 35 includes a charging contactor 351 and a third fuse 352 connected in series. The auxiliary drive power distribution module 36 includes a PTC thermistor power distribution circuit 361, an air conditioning power distribution circuit 362, and an auxiliary power distribution circuit 363 connected in parallel. The PTC thermistor power distribution circuit 361 includes a first push-button switch 3611, a fourth fuse 3612, and a PTC thermistor 3613 connected in series. The air conditioning power distribution circuit 362 includes a second push-button switch 3621, a fifth fuse 3622, and an air conditioner 3623 connected in series.

[0046] The auxiliary power distribution circuit 363 includes a third push-button switch 3631, a sixth fuse 3632, a seventh fuse 3633, a powertrain configuration unit 3634, and an electric power steering system unit 3635. The sixth fuse 3632 and the powertrain configuration unit 3634 are connected in series to form a first branch. The seventh fuse 3633 and the electric power steering system unit 3635 are connected in series to form a second branch. The first branch and the second branch are connected in parallel and then connected in series with the third push-button switch 3631.

[0047] The main drive power distribution module 37 includes a fourth push-button switch 371, a fifth push-button switch 372, an eighth fuse 373, a ninth fuse 374, and a main control unit 375. One end of the fourth push-button switch 371 is connected to one end of the main circuit breaker 33 and one end of the fifth push-button switch 372. The other end of the fifth push-button switch 372 is connected to one end of the eighth fuse 373. The other end of the eighth fuse 373 is connected to the other end of the fourth push-button switch 371 and one end of the ninth fuse 374. The other end of the ninth fuse 374 is connected to one end of the main control unit 375. The other end of the main control unit 375 is connected to the negative terminal of the power battery 31.

[0048] Example 3

[0049] This embodiment further explains the control of the vehicle's power-on / off state and charging function by driving the low-voltage power control circuit 2 through gear switching. See [link to documentation]. Figure 1 and Figure 2 The power-on process for the vehicle includes switching from OFF to ACC, from ACC to ON, and from ON to start. The specific steps are as follows:

[0050] When the OFF position is switched to the ACC position, the ACC signal of the ignition lock 215 is connected to the ground wire through the B1 pin and transmitted to the vehicle DC-DC converter 1 through the charging and ACC conversion relay 213. The vehicle DC-DC converter 1 receives the ACC signal and starts working, and the ACC position is successfully powered on.

[0051] When the ACC position is switched to the ON position, the IG2 signal of the ignition lock 215 is connected to the ACC power phase through the B2 pin to obtain a high-level signal. The ON position relay 226 receives the high-level signal and is energized, and the ON position is successfully powered on.

[0052] After successful power-on in the ON position, the vehicle's DC-DC converter 1 drives the insulation detection module 34 to perform insulation detection, and drives the auxiliary drive power distribution module to manage and distribute the auxiliary power of the electric commercial vehicle, completing the power distribution work of the auxiliary drive power distribution module.

[0053] When the ON position is switched to the start position, the ST signal of the ignition lock 215 is connected to the ACC power phase through the B2 pin to obtain a high-level signal. The high-level signal is transmitted to the main control unit 375, and the main control unit 375 controls the drive power distribution module 37 to distribute power, and the vehicle starts successfully.

[0054] Specifically, when switching from the ON position to the start position, the B1 pin of the ignition lock 215 is disconnected from the ACC pin, but the IG1 pin of the ignition lock 215 is connected to the ACC pin, ensuring that the ACC negative control signal is always present and that the vehicle's DC-DC power supply is uninterrupted.

[0055] The process of switching gears when the vehicle is powered off includes switching from ON to ACC and switching from ACC to OFF. The specific process is as follows:

[0056] When the ON position is switched to the ACC position, the IG2 pin and B2 pin of the ignition lock 215 disconnect the signal connection, the ON position relay 216 is disconnected, the ON position signal is lost, the vehicle DC-DC converter 1 is connected to the vehicle controller 22, the battery management system module 23 and the high voltage adapter system module 24 through the vehicle CAN line 4 to exchange information, the vehicle is powered off normally, and the ON position is powered off successfully.

[0057] When the ACC gear is switched to the OFF gear, the ACC signal of the ignition lock 215 is disconnected from the ground wire through the B1 pin. The vehicle DC-DC converter 1 receives the delayed power-off signal from the network of the vehicle CAN line 4. The vehicle DC-DC converter 1 is powered off after a delay to store and record normal vehicle data. The ACC gear is successfully powered off.

[0058] The charging process is as follows:

[0059] When the charging socket 214 is connected to an external power source, the charging and ACC conversion relay 213 receives the external power signal and is activated. The vehicle DC-DC converter 1 receives the grounded negative control signal and starts working, supplying ACC power to the vehicle controller 22, battery management system module 23 and high-voltage adapter system module 24. The charging CAN signal in the network of the vehicle CAN line 4 activates the vehicle controller 22, battery management system module 23 and high-voltage adapter system module 24, and also charges the vehicle through the charging switch circuit 35 in the high-voltage power supply circuit 3.

[0060] In this embodiment, the vehicle DC-DC converter 1 is modified to be negative-controlled activated, that is, the negative terminal of the vehicle DC-DC converter 1, which is supplied with high voltage, is led out. When the control signal of the vehicle DC-DC converter 1 is grounded, the vehicle DC-DC converter 1 starts to work. When the charging socket 214 is connected to an external power source, the charging and ACC conversion relay 213 receives the external power signal and is activated. The vehicle DC-DC converter 1 receives the grounded negative control signal and starts to work, supplying power to the vehicle controller 22, the battery management system module 23, and the high-voltage adapter system module 24. The system supplies ACC power to ensure the normal operation of the vehicle DC-DC converter 1 and the power supply of the entire vehicle during charging. Through CAN communication between the vehicle DC-DC converter 1, the vehicle controller 22, the battery management system module 23, and the high-voltage adapter system module 24, when power is off, the vehicle DC-DC converter 1 receives a delayed power-off signal from the network of the vehicle CAN line 4, and the vehicle DC-DC converter 1 is powered off after a delay to store and record normal vehicle data. The high-voltage power supply circuit 3 is changed from relay control to direct connection to the power battery 31, so that the high-voltage power supply of the vehicle DC-DC converter 1 is always available.

[0061] Example 4

[0062] This embodiment also proposes a power control method for electric commercial vehicles, including the following steps:

[0063] S1. Connect the vehicle DC-DC converter 1 to the low-voltage power control circuit 2;

[0064] S2. Ground the control signal of the vehicle DC-DC converter 1, activate the vehicle DC-DC converter 1 under negative control, and drive the low-voltage power control circuit 2 to switch gears to control the vehicle's power-on / off status and charging function.

[0065] S3. Connect the high-voltage power supply circuit 3 in parallel with the vehicle DC-DC converter 2, and use the high-voltage power supply circuit 3 to supply high voltage to the vehicle DC-DC converter 2.

[0066] In this embodiment, the vehicle DC-DC converter is first connected to the low-voltage power control circuit. Then, after the control signal of the vehicle DC-DC converter is grounded, the negative control of the vehicle DC-DC converter is activated. This solves the problem that the vehicle cannot control components through positive control because there is no low-voltage battery in the vehicle. The vehicle DC-DC converter controls the vehicle's power-on / off status and charging function by driving the gear switching of the low-voltage power control circuit, thus meeting the normal power-on / off requirements of the vehicle. The high-voltage power supply circuit is connected in parallel with the vehicle DC-DC converter. The high-voltage power supply circuit can operate by supplying high voltage to the vehicle DC-DC converter. This invention eliminates the need for a low-voltage battery for starting, thereby reducing the overall vehicle cost and the failure rate of low-voltage battery discharge, and improving the efficiency of vehicle power control.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A power control system for an electric commercial vehicle, characterized in that, The system includes: a vehicle DC-DC converter (1), a low-voltage power control circuit (2), and a high-voltage power supply circuit (3). The vehicle DC-DC converter (1) is connected to the low-voltage power control circuit (2). The vehicle DC-DC converter (1) is activated by negative control after the control signal of the vehicle DC-DC converter (1) is grounded. It controls the power-on and power-off status and charging function of the vehicle by driving the gear switching of the low-voltage power control circuit (2). The high-voltage power supply circuit (3) is connected in parallel with the vehicle DC-DC converter (1). The high-voltage power supply circuit (3) supplies high voltage to the vehicle DC-DC converter (1). The low-voltage power control circuit (2) includes a gear shifting circuit (21), a vehicle controller (22), a battery management system module (23), and a high-voltage adapter system module (24). The output terminal of the vehicle DC-DC converter (1) is connected to the input terminal of the low-voltage power control circuit (2), and the output terminal of the low-voltage power control circuit (2) is connected to the input terminal of the vehicle DC-DC converter (1). The vehicle controller (22), the battery management system module (23), and the high-voltage adapter system module (24) are connected in parallel with the gear shifting circuit (21). The gear positions include OFF, ACC, ON, and start. The gear shifting circuit (21) includes a first fuse (211), a main power switch relay (212), a charging and ACC conversion relay (213), a charging socket (214), an ignition lock (215), and an ON position relay (216). The vehicle DC-DC converter (1) is connected to one end of the first fuse (211), and the other end of the first fuse (211) is connected to the common point of the main power switch relay (212) and one end of the control coil of the main power switch relay (212). The control coil of the main power switch relay (212)... The other end is connected to the input terminal of the vehicle controller (22) and the common point of the charging and ACC conversion relay (213). The normally closed contact of the charging and ACC conversion relay (213) is connected to the ACC pin of the ignition lock (215). The IG1 pin and B1 pin of the ignition lock (215) are grounded together. The B1 pin of the ignition lock (215) is also connected to the neutral terminal of the charging socket, the normally open contact of the charging and ACC conversion relay (213), and one end of the control coil of the charging and ACC conversion relay (213). The charging and ACC conversion relay (213) The other end of the control coil is connected to the live wire of the charging socket. The normally open contact of the main power switch relay (212) is connected to the B2 pin of the ignition lock (215) and the common point of the ON position relay (216). One end of the control coil of the ON position relay (216) is grounded, and the other end of the control coil of the ON position relay (216) is connected to the IG2 pin of the ignition lock (215). The normally open contact of the ON position relay (216) is connected to one end of the vehicle controller (22), the battery management system module (23), and the high voltage adapter system module (24). The other ends of the device (22), the battery management system module (23) and the high voltage adapter system module (24) are connected to the normally open contact of the power main switch relay (212). The vehicle controller (22), the battery management system module (23) and the high voltage adapter system module (24) are respectively connected to the ground wire. The vehicle controller (22) is also connected to the ST pin of the ignition lock (215). The vehicle DC-DC converter (1) is also connected to the vehicle controller (22), the battery management system module (23) and the high voltage adapter system module (24) through the vehicle CAN line (4). The power-on / off status and charging function of the vehicle are controlled by switching the gear position of the low-voltage power control circuit (2). The gear position switching process for powering on the vehicle includes switching from OFF to ACC, switching from ACC to ON, and switching from ON to start. The specific process is as follows: When the OFF position is switched to the ACC position, the ACC signal of the ignition lock (215) is connected to the ground wire through the B1 pin and transmitted to the vehicle DC-DC converter (1) through the charging and ACC conversion relay (213). The vehicle DC-DC converter (1) receives the ACC signal and starts working. The ACC position is successfully powered on. When the ACC position is switched to the ON position, the IG2 signal of the ignition lock (215) is connected to the ACC power phase through the B2 pin to obtain a high-level signal. The ON position relay (216) receives the high-level signal and is energized, and the ON position is successfully powered on. When the ON position is switched to the start position, the ST signal of the ignition lock (215) is connected to the ACC power phase through the B2 pin to obtain a high-level signal. The high-level signal is transmitted to the main control unit (375), and the main control unit (375) controls the drive power distribution module (37) to distribute power, and the vehicle starts successfully. The process of switching gears when the vehicle is powered off includes switching from ON to ACC and switching from ACC to OFF. The specific process is as follows: When the ON position is switched to the ACC position, the IG2 pin of the ignition lock (215) is disconnected from the B2 pin, the ON position relay (216) is disconnected, the ON position signal is lost, the vehicle DC-DC converter (1) is connected to the vehicle controller (22), the battery management system module (23) and the high voltage adapter system module (24) through the vehicle CAN line (4) to exchange information, the vehicle is powered off normally, and the ON position is powered off successfully; When the ACC gear is switched to the OFF gear, the ACC signal of the ignition lock (215) is disconnected from the ground wire through the B1 pin. The vehicle DC-DC converter (1) receives the delayed power-off signal in the network of the vehicle CAN line (4). The vehicle DC-DC converter (1) is powered off after a delay to store and record normal vehicle data. The ACC gear is successfully powered off. The charging process is as follows: When the charging socket (214) is connected to an external power source, the charging and ACC conversion relay (213) receives the external power source signal and is activated. The vehicle DC-DC converter (1) receives the grounded negative control signal and starts working, supplying ACC power to the vehicle controller (22), battery management system module (23) and high voltage adapter system module (24). The charging CAN signal in the network of the vehicle CAN line (4) activates the vehicle controller (22), battery management system module (23) and high voltage adapter system module (24), and also charges the vehicle through the charging switch circuit (35) in the high voltage power supply circuit (3).

2. The electric commercial vehicle power control system according to claim 1, characterized in that, The high-voltage power supply circuit (3) includes a power battery (31), a second fuse (32), a main circuit breaker (33), an insulation detection module (34), a charging switch circuit (35), an auxiliary drive power distribution module (36) for managing and distributing auxiliary power to electric commercial vehicles, and a main drive power distribution module (37) for managing and distributing high-voltage power to electric commercial vehicles. The positive terminal of the power battery (31) is connected to one end of the second fuse (32) and the main circuit breaker (33), respectively. The other end of the second fuse (32) is connected to one end of the vehicle DC-DC converter. The other end of the vehicle DC-DC converter is connected to the negative terminal of the power battery and one end of the insulation detection module (34), respectively. The other end of the insulation detection module (34) is connected to the second fuse (32). The charging switch circuit (35), the auxiliary drive power distribution module (36), and the main drive power distribution module (37) are connected in parallel with the insulation detection module (34), respectively.

3. The electric commercial vehicle power control system according to claim 2, characterized in that, The charging switch circuit (35) includes a charging contactor (351) and a third fuse (352) connected in series. The auxiliary drive power distribution module (36) includes a PTC thermistor power distribution circuit (361), an air conditioning power distribution circuit (362), and an auxiliary power distribution circuit (363) connected in parallel. The PTC thermistor power distribution circuit (361) includes a first push button switch (3611), a fourth fuse (3612), and a PTC thermistor (3613) connected in series. The air conditioning power distribution circuit (362) includes a second push button switch (3621), a fifth fuse (3622), and an air conditioner (3623) connected in series.

4. The electric commercial vehicle power control system according to claim 3, characterized in that, The auxiliary power distribution circuit (363) includes a third push-button switch (3631), a sixth fuse (3632), a seventh fuse (3633), a powertrain configuration unit (3634), and an electric power steering system unit (3635). The sixth fuse (3632) and the powertrain configuration unit (3634) are connected in series to form a first branch. The seventh fuse (3633) and the electric power steering system unit (3635) are connected in series to form a second branch. The first branch and the second branch are connected in parallel and then connected in series with the third push-button switch (3631).

5. The electric commercial vehicle power control system according to claim 4, characterized in that, The main drive power distribution module (37) includes a fourth push button switch (371), a fifth push button switch (372), an eighth fuse (373), a ninth fuse (374), and a main control unit (375). One end of the fourth push button switch (371) is connected to one end of the main circuit breaker (33) and one end of the fifth push button switch (372). The other end of the fifth push button switch (372) is connected to one end of the eighth fuse (373). The other end of the eighth fuse (373) is connected to the other end of the fourth push button switch (371) and one end of the ninth fuse (374). The other end of the ninth fuse (374) is connected to one end of the main control unit (375). The other end of the main control unit (375) is connected to the negative terminal of the power battery (31).

6. A power control method for an electric commercial vehicle, using the system described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Connect the vehicle DC-DC converter (1) to the low-voltage power control circuit (2); S2. Ground the control signal of the vehicle DC-DC converter (1), activate the vehicle DC-DC converter (1) under negative control, and drive the low-voltage power control circuit (2) to switch gears to control the vehicle's power-on and power-off status and charging function; S3. Connect the high-voltage power supply circuit (3) in parallel with the vehicle DC-DC converter (1) and use the high-voltage power supply circuit (3) to supply high voltage to the vehicle DC-DC converter (1).

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