A heating and air conditioning power distribution control system for parking and charging scenarios

Abstract

The technical solution adopted by the present invention is: a heating and air conditioning power distribution control system in parking and charging scenarios, including a vehicle key ignition switch, a PTC start switch, an electric air conditioning start switch, a power battery system, a vehicle power distribution unit, an electric air compressor control module, a cab control panel, an electric air conditioning controller, and a PTC controller; wherein the vehicle key ignition switch is electrically connected to the CAN bus; the PTC start switch and the electric air conditioning start switch are electrically connected to the CAN bus via the cab control panel; the electric air conditioning controller and the PTC controller are electrically connected to the CAN bus; the vehicle power distribution unit is electrically connected to the CAN bus; the power battery system supplies power to the electric air compressor control module, the electric air conditioning controller, and the PTC controller via the vehicle power distribution unit. The present invention realizes heating and air conditioning functions in different application scenarios while strengthening system safety.

Description

Technical Field

[0001] The present invention belongs to the field of new energy vehicle driving technology and high-voltage safety technology, and specifically relates to a heating and air conditioning power distribution control system in parking and charging scenarios. Background Art

[0002] With the rapid development of new energy vehicles, the electrical components of traditional fuel vehicles are also developing in the direction of high voltage and electrification, such as high voltage electric air conditioners and PTC heating systems. High voltage electric air conditioners and PTC heating systems obtain electrical energy from the power battery through the vehicle power distribution unit PDU in the all-in-one controller to drive the air conditioning system and heating system. Among them, the load of the PTC heating system is a pure resistive load, and its distribution circuit does not need to be pre-charged; the front end of the compressor controller of the high voltage electric air conditioner has a voltage-stabilizing bus capacitor. Due to cost and space constraints, there is no pre-charging circuit inside the compressor controller. When distributing high voltage, the bus capacitor needs to be charged first, otherwise it will cause the distribution circuit contactor to close under load and cause adhesion.

[0003] There are currently three main technical solutions for power distribution of high-voltage electric air conditioners and PTC heating systems:

[0004] Solution 1: The PTC heating system uses an independent power distribution circuit without pre-charging function, and the high-voltage electric air conditioner uses an independent power distribution circuit with pre-charging.

[0005] Solution 2: The PTC heating system uses an independent power distribution circuit without pre-charging function, and the high-voltage electric air conditioner and the main drive motor power distribution circuit share the pre-charging and main contactor.

[0006] Solution 3: The PTC heating system uses an independent power distribution circuit without pre-charging function. The high-voltage electric air conditioner and auxiliary drive load (electric steering, electric air compressor, DCDC converter) power distribution circuit share pre-charging and main contactor.

[0007] However, the prior art solutions have the following disadvantages:

[0008] Solution 1: Since the high-voltage electric air conditioner uses an independent distribution circuit with pre-charging, it is necessary to separately add a pre-charging contactor, pre-charging resistor and distribution main contactor, which increases the cost of the PDU and makes the PDU layout difficult and the size increases.

[0009] Solution 2: Since the high-voltage electric air conditioner and the main drive motor power distribution circuit share the pre-charge and main contactor, according to regulatory requirements, in charging and parking application scenarios, the contactor of the main drive circuit must be disconnected, which results in the hardware not supporting the provision of high-voltage power distribution to the electric air conditioner in charging or parking application scenarios. It cannot meet the needs of customers in specific markets.

[0010] Solution 3: The closing of the auxiliary drive contactor is mostly associated with the closing command of the main drive contactor, which can only realize the air conditioning and heating power distribution in the driving application scenario, but cannot realize the heating and air conditioning high-voltage power distribution in the parking and charging application scenarios, and thus cannot realize the heating and air conditioning functions in these two scenarios. It cannot meet the needs of customers in specific markets. Summary of the invention

[0011] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a heating and air conditioning power distribution control system for parking and charging scenarios, which can enhance the system safety while realizing the heating and air conditioning functions in different application scenarios.

[0012] The technical solution adopted by the present invention is: a heating and air conditioning power distribution control system in parking and charging scenarios, including a vehicle key ignition switch, a PTC start switch, an electric air conditioning start switch, a power battery system, a vehicle power distribution unit, an electric air compressor control module, a cab control panel, an electric air conditioning controller, and a PTC controller; wherein the vehicle key ignition switch is electrically connected to the CAN bus; the PTC start switch and the electric air conditioning start switch are electrically connected to the CAN bus via the cab control panel; the electric air conditioning controller and the PTC controller are electrically connected to the CAN bus; the vehicle power distribution unit is electrically connected to the CAN bus; the power battery system supplies power to the electric air compressor control module, the electric air conditioning controller and the PTC controller via the vehicle power distribution unit.

[0013] In the above technical solution, the vehicle power distribution unit includes an auxiliary drive contactor; the power battery system supplies power to the electric air conditioner controller via the auxiliary drive contactor.

[0014] In the above technical solution, the vehicle power distribution unit includes a PTC contactor; the power battery system supplies power to the PTC controller via the PTC contactor.

[0015] The above technical solution also includes an all-in-one controller; the vehicle power distribution unit and the electric air compressor control module are both integrated in the all-in-one controller.

[0016] In the above technical solution, the cab control panel receives the electric air conditioner start switch status signal, the PTC start switch status signal, the target temperature signal and the cab actual temperature signal;

[0017] If the cab control panel determines that the electric air conditioner start switch is in the closed state, a valid electric air conditioner controller enable signal, a target temperature signal and a cab actual temperature signal are sent to the electric air conditioner controller, and a valid electric air conditioner controller enable signal is sent to the vehicle power distribution unit; if the cab control panel determines that the electric air conditioner start switch is in the open state, an invalid electric air conditioner controller enable signal is sent to the electric air conditioner controller;

[0018] If the cab control panel determines that the PTC start switch is in the closed state, a valid PTC controller enable signal, a target temperature signal and an actual cab temperature signal are sent to the PTC controller, and a valid PTC controller enable signal is sent to the vehicle power distribution unit; if the cab control panel determines that the PTC start switch is in the open state, an invalid PTC controller enable signal is sent to the PTC controller.

[0019] In the above technical solution, the vehicle power distribution unit receives the vehicle key ignition switch status signal, the electric air-conditioning controller enable signal and the electric air-conditioning controller status signal through the CAN bus; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state, and the electric air-conditioning controller enable signal is valid, and the electric air-conditioning controller is in a non-working state, the vehicle power distribution unit sends a closing command to the auxiliary drive contactor; after the auxiliary drive contactor is closed, the power battery system supplies power to the electric air-conditioning controller via the auxiliary drive contactor; the vehicle power distribution unit sends the auxiliary drive contactor status signal to the electric air-conditioning controller; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state, and the electric air-conditioning controller enable signal is invalid, and the electric air-conditioning controller is in a non-working state, the vehicle power distribution unit sends a disconnection command to the auxiliary drive contactor; after the auxiliary drive contactor is closed, the power battery system stops supplying power to the electric air-conditioning controller.

[0020] In the above technical solution, after the electric air-conditioning controller is powered on, it receives the electric air-conditioning controller enable signal, the target temperature signal, the actual cab temperature signal and the auxiliary drive contactor status signal; if the electric air-conditioning controller determines that the electric air-conditioning controller enable signal is valid, and the actual cab temperature signal is higher than the target temperature, and the auxiliary drive contactor is in a closed state, the electric air-conditioning controller starts working; if the electric air-conditioning controller determines that the electric air-conditioning controller enable signal is invalid, the electric air-conditioning controller stops working.

[0021] In the above technical solution, the vehicle power distribution unit receives the vehicle key ignition switch status signal and the PTC controller enable signal through the CAN bus; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state and the PTC controller enable signal is valid, the vehicle power distribution unit sends a closing command to the PTC contactor; after the PTC contactor is closed, the power battery system supplies power to the PTC controller via the PTC contactor; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state and the PTC controller enable signal is invalid, the vehicle power distribution unit sends a disconnection command to the PTC contactor; after the PTC contactor is disconnected, the power battery system stops supplying power to the PTC controller.

[0022] In the above technical solution, after the PTC controller is powered on, it receives the PTC enable signal, the target temperature signal and the actual temperature signal of the cab; if the PTC controller determines that the PTC controller enable signal is valid and the actual temperature signal of the cab is lower than the target temperature, the PTC controller starts working; if the PTC controller determines that the PTC controller enable signal is invalid, the PTC controller stops working.

[0023] In the above technical solution, the electric air compressor control module receives the current state signal of the main contactor of the main drive power distribution circuit through the vehicle power distribution unit, and receives the vehicle speed signal through the CAN bus; when the electric air compressor control module determines that the main contactor of the main drive power distribution circuit is in the disconnected state and the vehicle speed is less than the set value, it is determined that the vehicle is in a non-driving state, and the electric air compressor control module is prohibited from outputting instructions.

[0024] The beneficial effects of the present invention are as follows: the present invention proposes a heating and air conditioning power distribution control system for parking and charging scenarios. Regardless of the parking or charging application scenario, when the driver needs the air conditioning or heating function, he must first turn the key to the ON position, and then operate the air conditioning panel, which effectively improves the overall safety of the system. The high-voltage power distribution device PDU in the all-in-one controller of the present invention closes the relevant contactors according to the heating or cooling request signal issued by the cab air conditioning panel. Before the contactor is closed or disconnected, the PDU detects the working status of the rear-end load to avoid the load-bearing closing or disconnection of the internal contactor of the PDU. The air compressor control module ACU in the all-in-one controller of the present invention determines when the vehicle is in the parking or charging scenario based on the vehicle speed signal and the charging wake-up signal. In these two scenarios, the air compressor inflation function is automatically disabled to reduce the power consumption of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of module connection of the present invention

[0026] Figure 2-a This is a working diagram of the cab control panel when the present invention is powered on

[0027] Figure 2-b This is the working flow diagram of the vehicle power distribution unit when the present invention is powered on

[0028] Figure 2-c The working flow diagram of the PTC controller when the present invention is powered on

[0029] Figure 2-d This is a working diagram of the electric air conditioner controller when the present invention is powered on.

[0030] Figure 3-a This is a working diagram of the cab control panel when the present invention is powered off

[0031] Figure 3-b This is the working flow diagram of the vehicle power distribution unit when the power is turned off in the present invention

[0032] Figure 3-c This is the working flow diagram of the PTC controller when the power is turned off in the present invention

[0033] Figure 3-d This is a working diagram of the electric air conditioner controller when the power is turned off.

[0034] Figure 4 It is the air compressor control flow chart of the present invention.

[0035] Among them, 101-vehicle key ignition switch, 102-PTC start switch, 103-electric air conditioning start switch, 104-power battery system, 105-all-in-one controller, 106-vehicle power distribution unit, 107-auxiliary drive contactor, 108-PTC contactor, 109-electric air compressor control module, 110-cab control panel, 111-electric air conditioning controller, 112-PTC controller. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0037] like Figure 1 As shown, the present invention provides a heating and air conditioning power distribution control system in parking and charging scenarios, including a vehicle key ignition switch 101, a PTC start switch 102, an electric air conditioning start switch 103, a power battery system 104, a vehicle power distribution unit 106, an electric air compressor control module 109, a cab control panel 110, an electric air conditioning controller 111, and a PTC controller 112; wherein the vehicle key ignition switch 101 is electrically connected to the CAN bus; the PTC start switch 102 and the electric air conditioning start switch 103 are electrically connected to the CAN bus via the cab control panel 110; the electric air conditioning controller 111 and the PTC controller 112 are electrically connected to the CAN bus; the vehicle power distribution unit 106 is electrically connected to the CAN bus; the power battery system 104 supplies power to the electric air compressor control module 109, the electric air conditioning controller 111 and the PTC controller 112 via the vehicle power distribution unit 106.

[0038] Specifically, the vehicle power distribution unit 106 includes an auxiliary drive contactor 107 ; the power battery system 104 supplies power to the electric air conditioner controller 111 via the auxiliary drive contactor 107 .

[0039] Specifically, the vehicle power distribution unit 106 includes a PTC contactor 108 ; the power battery system 104 supplies power to the PTC controller 112 via the PTC contactor 108 .

[0040] Specifically, it also includes an all-in-one controller 105 ; the vehicle power distribution unit 106 and the electric air compressor control module 109 are both integrated in the all-in-one controller 105 .

[0041] Specifically, the cab control panel 110 receives the state signal of the electric air conditioner start switch 103, the state signal of the PTC start switch 102, the target temperature signal and the actual temperature signal of the cab;

[0042] If the cab control panel 110 determines that the electric air conditioner start switch 103 is in a closed state, a valid electric air conditioner controller 111 enable signal, a target temperature signal and a cab actual temperature signal are sent to the electric air conditioner controller 111, and a valid electric air conditioner controller 111 enable signal is sent to the vehicle power distribution unit 106; if the cab control panel 110 determines that the electric air conditioner start switch 103 is in an open state, an invalid electric air conditioner controller 111 enable signal is sent to the electric air conditioner controller 111;

[0043] If the cab control panel 110 determines that the PTC start switch 102 is in a closed state, a valid PTC controller 112 enable signal, a target temperature signal and an actual cab temperature signal are sent to the PTC controller 112, and a valid PTC controller 112 enable signal is sent to the vehicle power distribution unit 106; if the cab control panel 110 determines that the PTC start switch 102 is in an open state, an invalid PTC controller 112 enable signal is sent to the PTC controller 112.

[0044] Specifically, the vehicle power distribution unit 106 receives the vehicle key ignition switch 101 state signal, the electric air conditioning controller 111 enable signal and the electric air conditioning controller 111 state signal through the CAN bus; if the vehicle power distribution unit 106 determines that the vehicle key ignition switch 101 is in the ON state, and the electric air conditioning controller 111 enable signal is valid, and the electric air conditioning controller 111 is in the non-working state, the vehicle power distribution unit 106 sends a closing instruction to the auxiliary drive contactor 107; after the auxiliary drive contactor 107 is closed, the power battery system 104 is connected to the auxiliary drive contactor 107 via the auxiliary drive contactor 107. The auxiliary drive contactor 107 supplies power to the electric air-conditioning controller 111; the vehicle power distribution unit 106 sends a status signal of the auxiliary drive contactor 107 to the electric air-conditioning controller 111; if the vehicle power distribution unit 106 determines that the vehicle key ignition switch 101 is in the ON state, and the enable signal of the electric air-conditioning controller 111 is invalid, and the electric air-conditioning controller 111 is in a non-working state, the vehicle power distribution unit 106 sends a disconnection command to the auxiliary drive contactor 107; after the auxiliary drive contactor 107 is closed, the power battery system 104 stops supplying power to the electric air-conditioning controller 111.

[0045] Specifically, after the electric air-conditioning controller 111 is powered on, it receives the electric air-conditioning controller 111 enable signal, the target temperature signal, the actual cab temperature signal and the auxiliary drive contactor 107 status signal; if the electric air-conditioning controller 111 determines that the electric air-conditioning controller 111 enable signal is valid, and the actual cab temperature signal is higher than the target temperature, and the auxiliary drive contactor 107 is in a closed state, the electric air-conditioning controller 111 starts working; if the electric air-conditioning controller 111 determines that the electric air-conditioning controller 111 enable signal is invalid, the electric air-conditioning controller 111 stops working.

[0046] Specifically, the vehicle power distribution unit 106 receives the status signal of the vehicle key ignition switch 101 and the enable signal of the PTC controller 112 through the CAN bus; if the vehicle power distribution unit 106 determines that the vehicle key ignition switch 101 is in the ON state and the enable signal of the PTC controller 112 is valid, the vehicle power distribution unit 106 sends a closing instruction to the PTC contactor 108; after the PTC contactor 108 is closed, the power battery system 104 supplies power to the PTC controller 112 via the PTC contactor 108; if the vehicle power distribution unit 106 determines that the vehicle key ignition switch 101 is in the ON state and the enable signal of the PTC controller 112 is invalid, the vehicle power distribution unit 106 sends a disconnection instruction to the PTC contactor 108; after the PTC contactor 108 is disconnected, the power battery system 104 stops supplying power to the PTC controller 112.

[0047] Specifically, after the PTC controller 112 is powered on, it receives a PTC enable signal, a target temperature signal and an actual cab temperature signal; if the PTC controller 112 determines that the PTC controller 112 enable signal is valid and the actual cab temperature signal is lower than the target temperature, the PTC controller 112 starts working; if the PTC controller 112 determines that the PTC controller 112 enable signal is invalid, the PTC controller 112 stops working.

[0048] Specifically, the electric air compressor control module 109 receives the current state signal of the main contactor of the main drive power distribution circuit through the vehicle power distribution unit 106, and receives the vehicle speed signal through the CAN bus; when the electric air compressor control module 109 determines that the main contactor of the main drive power distribution circuit is in the disconnected state and the vehicle speed is less than the set value, it is determined that the vehicle is in a non-driving state, and the electric air compressor control module 109 is prohibited from outputting instructions.

[0049] The technical solution and working principle of the present invention are further explained below in conjunction with specific embodiments.

[0050] The present invention is mainly used for safe power distribution control of heating and air conditioning in parking and charging scenarios. The safe power distribution control circuit of heating and air conditioning in parking and charging scenarios proposed by the present invention is composed of a vehicle key ignition switch 101, a PTC start switch 102, an electric air conditioning start switch 103, a power battery system 104, an all-in-one controller 105, a vehicle power distribution unit (PDU) 106, an auxiliary drive contactor 107, a PTC contactor 108, an electric air compressor control module (ACU) 109, a cab control panel 110, an electric air conditioning controller 111, and a PTC controller 112 (such as Figure 1 shown).

[0051] When parking or charging, to realize the air conditioning cooling or PTC heating function, the driver needs to first turn the key ignition switch 101 to the ON position, and then press the PTC start switch 102 or the electric air conditioning start switch 103 according to the heating or cooling requirements, so that the cab control panel 110 sends an enable signal to the PTC controller 112 or the electric air conditioning controller 111 through the CAN bus. At the same time, the vehicle power distribution unit 106 in the all-in-one controller 105 also receives the heating PTC or electric air conditioning enable signal on the bus, and closes the auxiliary drive contactor 107 or PTC contactor 108 according to the enable signal, realizing the heating and air conditioning power distribution in the parking and charging scenarios.

[0052] based on Figure 1 The architecture of the system requires that the heating and air conditioning functions during parking and charging must be in the ON position. On the one hand, this is used to wake up the relevant high-voltage system. On the other hand, it prevents the driver from leaving the vehicle without turning off the heating and air conditioning during parking or charging, which would increase the vehicle's energy consumption.

[0053] At the same time, the power-on instruction from the vehicle power distribution unit 106 to the auxiliary drive contactor 107 is not only associated with the enable signal of the air-conditioning controller, but also needs to be associated with the operating status of the electric air-conditioning controller 111 to prevent the electric air-conditioning controller 111 from running in advance during the closing process of the auxiliary drive contactor 107; and the operation of the electric air-conditioning controller 111 must be associated with the status signal of the auxiliary drive contactor 107 issued by the vehicle power distribution unit 106. Only when the auxiliary drive contactor 107 is closed can the electric air-conditioning controller 111 start to run. In this way, a closed-loop control can be formed to avoid adhesion failures caused by the auxiliary drive contactor 107 being powered on with load, and to avoid locking failures caused by multiple unsuccessful power-ons due to undervoltage of the bus input voltage.

[0054] In addition, the brake air pump control module (ACU) 109 inside the all-in-one controller 105 determines that the vehicle is in a non-driving state based on the current vehicle speed signal and the main drive circuit contactor status signal. Even if the hard line or CAN line inflation enable signal is valid due to the drop in air pressure in the vehicle's brake system air tank, the brake air pump control module (ACU) 109 is prohibited from working to save vehicle energy consumption.

[0055] Figure 2-a The control flow chart of the cab control panel when the heating and air conditioning power distribution is powered on in the parking and charging application scenarios is shown. First, enter 201 and 202, the cab control panel detects the level of the heating PTC enable hard-wire signal input pin DI_Enable_PTC and the air conditioning enable hard-wire signal input pin DI_Enable_AC; ​​then enter 203 to determine whether DI_Enable_PTC is at a high level. If it is, it indicates that there is a demand for heating, enter 204 and 205, set the enable signal CAN_Enable_PTC in the message sent to the PTC controller, and send the actual cab temperature T_actual and the target temperature T_target to the PTC controller; otherwise, it indicates that the cab temperature is too high. It indicates that there is no demand for heating, and then enters 206 to continue to determine whether DI_Enable_AC is at a high level. If it is, it indicates that there is a demand for air conditioning and cooling, and enters 207 and 208, sets the enable signal CAN_Enable_AC in the message sent to the electric air conditioning controller (i.e., the air conditioning compressor controller), and sends the actual cab temperature T_actual and the target temperature T_actual to the electric air conditioning controller; otherwise, it indicates that there is no demand for heating and air conditioning, and directly executes 209 to receive and display the heating PTC operation status message and 210 to receive and display the air conditioning operation status message.

[0056] Figure 2-bThe figure shows the control flow chart of the vehicle power distribution unit when the heating and air conditioning power distribution is powered on in the parking and charging application scenarios. First, execute 211, 212, and 213 in sequence, receive and analyze the enable signal CAN_Enable_PTC sent by the cab control panel to the PTC controller, receive and analyze the enable signal CAN_Enable_AC sent by the cab control panel to the electric air-conditioning controller, and receive and analyze the working state signal CAN_State_AC of the electric air-conditioning controller; then enter 214 to determine whether CAN_Enable_AC==1&&CAN_State_AC==0 is satisfied. If so, it indicates that there is currently an air-conditioning demand and the electric air-conditioning controller is not currently running, and the auxiliary drive distribution circuit main contactor closing process 215 can be executed; otherwise, it indicates that the auxiliary drive distribution circuit in the vehicle distribution unit does not have the closing condition, and enter 216 to determine whether CAN_Enable_PTC==1 is satisfied. If so, it indicates that there is currently a warm air PTC demand, and the PTC distribution circuit contactor can be closed in 217; otherwise, jump directly to 218, and sequentially execute 218 auxiliary drive distribution circuit main contactor state feedback process and 219 feedback PTC distribution circuit contactor state Relay_PTC_sat.

[0057] Figure 2-c The control flow chart of the PTC controller when the heating and air conditioning power distribution is powered on in the parking and charging application scenarios is shown. First, execute 220 and 221 in sequence, receive and analyze the enable signal CAN_Enable_PTC sent by the cab control panel to the PTC controller, receive and analyze the actual temperature signal T_actual and the target temperature signal T_target of the cab; then enter 222 to determine whether CAN_Enable_PTC==1&&T_actual<T_target is satisfied, if yes, execute 223, start the PTC controller to start working, and then execute 224 to set and feedback the working state CAN_State_PTC of the PTC controller, otherwise jump to 220 to continue receiving and judging the enable signal of the PTC controller.

[0058] Figure 2-dThe control flow chart of the electric air conditioner controller when the heating and air conditioning power distribution is powered on in the parking and charging application scenarios is shown. First, execute 225, 226, and 227 in sequence, receive and analyze the enable signal CAN_Enable_AC sent by the cab control panel to the electric air conditioner controller, receive and analyze the current state signal Relay_subloop_sat of the auxiliary drive power distribution circuit main contactor, receive and analyze the actual temperature signal T_actual and the target temperature signal T_target of the cab; then enter 228 to determine whether CAN_Enable_AC==1&&Relay_subloop_sat==1&&T_actual<T_target is satisfied, if yes, execute 229 to start the electric air conditioner controller to start working, then execute 230 to set and feedback the working state CAN_State_AC of the electric air conditioner controller, otherwise jump to 225 to continue receiving and judging the enable signal of the electric air conditioner controller.

[0059] Figure 3-a The control flow chart of the cab control panel when the heating and air conditioning power distribution is turned off in the parking and charging application scenarios is shown. First, enter 301 and 202, the cab control panel detects the level of the heating PTC enable hard-wire signal input pin DI_Enable_PTC and the air conditioning enable hard-wire signal input pin DI_Enable_AC; ​​then enter 303 to determine whether DI_Enable_PTC is at a low level, if it is, it indicates that there is no heating demand, enter 304, reset the enable signal CAN_Enable_PTC in the message sent to the PTC controller; otherwise, enter 305 to continue to determine whether DI_Enable_AC is at a low level, if it is, it indicates that there is no air conditioning cooling demand, enter 306, reset the enable signal CAN_Enable_AC in the message sent to the electric air conditioning controller; otherwise, directly execute 307 to receive and display the heating PTC operation status message and 308 to receive and display the air conditioning operation status message.

[0060] Figure 3-bThe figure shows the control flow chart of the vehicle power distribution unit when the heating and air conditioning power distribution is turned off in the parking and charging application scenarios. First, execute 309, 310, and 311 in sequence, receive and analyze the enable signal CAN_Enable_PTC sent by the cab control panel to the PTC controller, receive and analyze the enable signal CAN_Enable_AC sent by the cab control panel to the electric air-conditioning controller, and receive and analyze the working state signal CAN_State_AC of the electric air-conditioning controller; then enter 312 to determine whether CAN_Enable_AC==0&&CAN_State_AC==0 is satisfied. If so, it indicates that there is no air-conditioning cooling demand and the current electric air-conditioning controller stops running, and 313 can be executed to disconnect the auxiliary drive power distribution circuit main contactor; otherwise, it indicates that the auxiliary drive power distribution circuit in the vehicle power distribution unit does not have the disconnection condition, and enter 314 to determine whether CAN_Enable_PTC==0 is satisfied. If so, it indicates that there is no warm air PTC demand at present, and 315 can be executed to disconnect the PTC power distribution circuit contactor; otherwise, jump directly to 316, and execute 316 auxiliary drive power distribution circuit main contactor state feedback process and 317 feedback PTC power distribution circuit contactor state Relay_PTC_sat in sequence.

[0061] Figure 3-c The control flow chart of the PTC controller when the heating and air conditioning power distribution is turned off in the parking and charging application scenarios is shown. First, execute 318 to receive and analyze the enable signal CAN_Enable_PTC sent by the cab control panel to the PTC controller; then enter 319 to determine whether CAN_Enable_PTC==0 is satisfied. If yes, execute 320 to stop the PTC controller, and then execute 321 to reset and feedback the PTC controller working state CAN_State_PTC. Otherwise, jump to 318 to continue receiving and judging the PTC controller enable signal.

[0062] Figure 3-d The control flow chart of the electric air conditioner controller when the heating and air conditioning power distribution is turned off in the parking and charging application scenarios is shown. First, execute 322 and 323 in sequence, receive and analyze the enable signal CAN_Enable_AC sent by the cab control panel to the electric air conditioner controller, receive and analyze the current state signal Relay_subloop_sat of the main contactor of the auxiliary drive power distribution circuit; then enter 324 to determine whether CAN_Enable_AC==0 is satisfied. If yes, it indicates that there is no air conditioning cooling demand, execute 325 to stop the electric air conditioner controller, and then execute 326 to reset and feedback the working state CAN_State_AC of the electric air conditioner controller, otherwise jump to 322 to continue receiving and judging the enable signal of the electric air conditioner controller.

[0063] Figure 4This is the control flow chart of the air compressor in the parking and charging application scenarios. First, execute 401 and 402 in sequence, receive and analyze the current state signal Relay_mainloop_sat of the main contactor of the main drive power distribution circuit, receive and analyze the speed signal SPEED_Vehicle sent by the instrument; then enter 403 to determine whether Relay_mainloop_sat==0&&SPEED_Vehicle<1km / h is satisfied. If so, it indicates that the vehicle is in a non-driving state, and 404 can be executed to prohibit the output of the air pump ACU module. Even if the ACU detects that the current air pressure is low, or the ACU hard-line enable signal is valid, the air pump instruction is not executed; otherwise, jump to 405 to feedback the working status of the ACU module.

[0064] Among them, Kenyon - key ON signal

[0065] DI_Enable_PTC——Heat PTC enable hard line signal

[0066] DI_Enable_AC——Air conditioning enable hard wire signal

[0067] CAN_Enable_PTC——heater PTC enable CAN signal

[0068] CAN_Enable_AC——Air conditioning enables CAN signal

[0069] T_actual——actual temperature of the cab

[0070] T_target——cab target temperature

[0071] CAN_State_PTC——Heater PTC controller working status signal

[0072] CAN_State_AC——Air conditioning compressor controller working status signal

[0073] Relay_mainloop_sat——main contactor status of main drive power distribution circuit

[0074] Relay_subloop_sat——Auxiliary drive power distribution circuit main contactor status

[0075] Relay_PTC_sat——PTC distribution circuit contactor status

[0076] Uo_Relay_subloop——Auxiliary drive power distribution circuit main contactor rear end voltage

[0077] SPEED_Vehicle——Vehicle speed signal

[0078] The heating and air conditioning power distribution control method for parking and charging application scenarios proposed in the present invention can be implemented on charging and battery replacement tractors. After implementation, it meets the heating needs of drivers in the northern market when charging in winter and parking for loading and unloading, and meets the air conditioning and cooling needs of drivers in the southern market when charging in summer and parking for loading and unloading.

[0079] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A heating and air conditioning power distribution control system for parking and charging scenarios, characterized in that: It includes a vehicle key ignition switch, a PTC start switch, an electric air conditioner start switch, a power battery system, a vehicle power distribution unit, an electric air compressor control module, a cab control panel, an electric air conditioner controller, and a PTC controller; wherein the vehicle key ignition switch is electrically connected to the CAN bus; the PTC start switch and the electric air conditioner start switch are electrically connected to the CAN bus via the cab control panel; the electric air conditioner controller and the PTC controller are electrically connected to the CAN bus; the vehicle power distribution unit is electrically connected to the CAN bus; the power battery system supplies power to the electric air compressor control module, the electric air conditioner controller, and the PTC controller via the vehicle power distribution unit; The vehicle power distribution unit includes an auxiliary drive contactor; the power battery system supplies power to the electric air conditioner controller and the electric air compressor control module via the auxiliary drive contactor; The vehicle power distribution unit receives the vehicle key ignition switch status signal, the electric air conditioning controller enable signal and the electric air conditioning controller status signal through the CAN bus; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state, the electric air conditioning controller enable signal is valid, and the electric air conditioning controller is in a non-working state, the vehicle power distribution unit sends a closing command to the auxiliary drive contactor; after the auxiliary drive contactor is closed, the power battery system supplies power to the electric air conditioning controller via the auxiliary drive contactor; the vehicle power distribution unit sends the auxiliary drive contactor status signal to the electric air conditioning controller; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state, the electric air conditioning controller enable signal is invalid, and the electric air conditioning controller is in a non-working state, the vehicle power distribution unit sends a disconnection command to the auxiliary drive contactor; after the auxiliary drive contactor is disconnected, the power battery system stops supplying power to the electric air conditioning controller; The electric air compressor control module receives the current state signal of the main contactor of the main drive power distribution circuit through the vehicle power distribution unit, and receives the vehicle speed signal through the CAN bus; when the electric air compressor control module determines that the main contactor of the main drive power distribution circuit is in the disconnected state and the vehicle speed is less than the set value, it determines that the vehicle is in a non-driving state and prohibits the electric air compressor control module from outputting instructions.

2. A heating and air conditioning power distribution control system in parking and charging scenarios according to claim 1, characterized in that: The vehicle power distribution unit includes a PTC contactor; the power battery system supplies power to the PTC controller via the PTC contactor.

3. The heating and air conditioning power distribution control system in parking and charging scenarios according to claim 1, characterized in that: It also includes an all-in-one controller; the vehicle power distribution unit and the electric air compressor control module are both integrated in the all-in-one controller.

4. The heating and air conditioning power distribution control system in parking and charging scenarios according to claim 1, characterized in that: The cab control panel receives the electric air conditioner start switch status signal, the PTC start switch status signal, the target temperature signal and the cab actual temperature signal; If the cab control panel determines that the electric air conditioner start switch is in the closed state, a valid electric air conditioner controller enable signal, a target temperature signal and a cab actual temperature signal are sent to the electric air conditioner controller, and a valid electric air conditioner controller enable signal is sent to the vehicle power distribution unit; if the cab control panel determines that the electric air conditioner start switch is in the open state, an invalid electric air conditioner controller enable signal is sent to the electric air conditioner controller; If the cab control panel determines that the PTC start switch is in the closed state, a valid PTC controller enable signal, a target temperature signal and an actual cab temperature signal are sent to the PTC controller, and a valid PTC controller enable signal is sent to the vehicle power distribution unit; if the cab control panel determines that the PTC start switch is in the open state, an invalid PTC controller enable signal is sent to the PTC controller.

5. A heating and air conditioning power distribution control system in parking and charging scenarios according to claim 4, characterized in that: After the electric air conditioning controller is powered on, it receives the electric air conditioning controller enable signal, the target temperature signal, the actual cab temperature signal and the auxiliary drive contactor status signal; if the electric air conditioning controller determines that the electric air conditioning controller enable signal is valid, and the actual cab temperature signal is higher than the target temperature, and the auxiliary drive contactor is in a closed state, the electric air conditioning controller starts working; if the electric air conditioning controller determines that the electric air conditioning controller enable signal is invalid, the electric air conditioning controller stops working.

6. A heating and air conditioning power distribution control system in parking and charging scenarios according to claim 5, characterized in that: The vehicle power distribution unit receives the vehicle key ignition switch status signal and the PTC controller enable signal through the CAN bus; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state and the PTC controller enable signal is valid, the vehicle power distribution unit sends a closing command to the PTC contactor; after the PTC contactor is closed, the power battery system supplies power to the PTC controller via the PTC contactor; if the vehicle power distribution unit determines that the vehicle key ignition switch is in the ON state and the PTC controller enable signal is invalid, the vehicle power distribution unit sends a disconnection command to the PTC contactor; after the PTC contactor is disconnected, the power battery system stops supplying power to the PTC controller.

7. A heating and air conditioning power distribution control system in parking and charging scenarios according to claim 6, characterized in that: After the PTC controller is powered on, it receives the PTC enable signal, the target temperature signal and the actual cab temperature signal; if the PTC controller determines that the PTC controller enable signal is valid and the actual cab temperature signal is lower than the target temperature, the PTC controller starts working; if the PTC controller determines that the PTC controller enable signal is invalid, the PTC controller stops working.

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