A heating system and control method for pure electric vehicle

Abstract

The invention discloses a pure electric vehicle heating system, comprising a water pump, a cooling pipeline of a motor controller, a cooling pipeline of a drive motor, and a water tank connected in sequence through pipelines, wherein the water outlet pipeline of the water tank is connected to the water inlet of the water pump to form a cooling circulation loop of the whole vehicle, a heating branch pipeline is connected in parallel on the pipeline between the water outlet of the water tank and the water inlet of the water pump, the water inlet end of the heating branch pipeline is connected to the pipeline near the water inlet of the water pump, the water outlet end of the heating branch pipeline is connected to the pipeline near the water outlet of the water tank, a monitoring system and an execution system are arranged on the heating branch pipeline, the monitoring system is used to collect signals and send the collected signals to the control system, the control system processes the signals and issues instructions to the execution system, and the supply of high and low warm air in the cab is realized by different connection modes of the execution pipeline of the execution system. The invention can reduce the power consumption of pure electric vehicles, improve the cruising range, save the layout space of the whole vehicle, and facilitate the maintenance of the whole vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of pure electric vehicles, and in particular to a warm air system and a control method for a pure electric vehicle. Background Art

[0002] With the continuous intensification of the energy crisis and the improvement of environmental protection requirements, the electrification of vehicles has become a trend. Due to the absence of the engine, the NVH performance of the vehicle has been significantly improved, which has improved the comfort of the driver and passengers. Among the comfort indicators, the performance of cold and warm air is equally important. But precisely because there is no engine, the motor and other components cannot provide sufficient heat like the engine when working to meet the demand for warm air, so auxiliary heating devices are needed, such as PTC liquid heaters. The existing electric vehicle heating system generally transports the cooling water in the cooling water circuit of the vehicle to the PTC liquid heater through a separate PTC water pump, and then transports it to the warm air tank in the vehicle body after heating, and exchanges heat between the air sent by the blower and the heated coolant. After the air is heated, it is sent into the vehicle through various air outlets by the blower, and the cooling water returns to the cooling water circuit of the vehicle after passing through the warm air tank.

[0003] In the process of implementing the present invention, the inventors found that the prior art has the following problems:

[0004] (1) In the current heating system, the cooling water heated by the PTC liquid heater comes from the vehicle's cooling water circuit. When the driver and passengers select a higher heating temperature, the cooling water passing through the PTC liquid heater is a mixed water after the cooling water enters the cooling water circuit after being heated and heat exchanged. The temperature of the mixed water is lower than the temperature of the water after being heated and heat exchanged by the PTC liquid heater. As a result, the PTC liquid heater is kept in a heating state for a long time to ensure the preset temperature, wasting the vehicle's electrical energy and causing a reduction in cruising range.

[0005] (2) When the heating system uses a separate cooling water circuit, an additional heating auxiliary water tank will be added, but it is not convenient for refilling the coolant and is not conducive to the overall layout when the cabin space is compact. Summary of the invention

[0006] In order to solve the problems of electric energy waste and cabin space occupation caused by the existing heating system, the present invention proposes a heating system and a control method for a pure electric vehicle.

[0007] To this end, the technical solution of the present invention is: a pure electric vehicle heating system, including a vehicle cooling circulation water circuit, the vehicle cooling circulation water circuit includes a water pump, a motor controller cooling pipeline, a drive motor cooling pipeline, and a water tank connected in sequence through pipelines, the water outlet of the water tank and the water inlet of the water pump are connected through a pipeline to form a vehicle cooling circulation loop, the pipeline between the water outlet of the water tank and the water inlet of the water pump is connected to the auxiliary water tank water outlet of the vehicle through a pipeline, and the upper water chamber of the water tank is connected to the degassing joint of the auxiliary water tank through a pipeline, characterized in that:

[0008] A heating branch pipeline is connected in parallel on the pipeline between the water outlet of the water tank and the water inlet of the water pump, wherein: the water inlet end of the heating branch pipeline is connected to the pipeline close to the water inlet of the water pump, and the water outlet end of the heating branch pipeline is connected to the pipeline close to the water outlet of the water tank; a monitoring system and an execution system are arranged on the heating branch pipeline, the monitoring system is used to collect signals and send the collected signals to the control system, the control system processes the signals and issues instructions to the execution system, and the supply of high and low warm air in the cab is realized through different connection methods of the execution pipeline of the execution system;

[0009] The heating branch pipeline includes a first three-way solenoid valve, a PTC water pump, a PTC liquid heater with over-temperature and over-current protection, a warm air water tank, and a second three-way solenoid valve, which are connected in sequence through pipelines between the water inlet and the water outlet, wherein the first three-way solenoid valve and the second three-way solenoid valve are directly connected through pipelines, and the PTC water pump is adapted to the head of the water pump; the first three-way solenoid valve, the PTC water pump, the PTC liquid heater, and the second three-way solenoid valve together constitute an execution system;

[0010] The monitoring system includes a large circulation flow sensor, a small circulation flow sensor, and a vehicle instrument. The large circulation flow sensor is connected in series on the pipeline between the second three-way solenoid valve and the water outlet of the heating branch pipeline, and is used to monitor the flow data flowing through the pipeline and send it to the vehicle controller; the small circulation flow sensor is connected in series on the pipeline between the first three-way solenoid valve and the second three-way solenoid valve, and is used to monitor the flow data flowing through the pipeline and send it to the vehicle controller; the vehicle instrument is installed in the cab, and is used to reflect the working status of each system;

[0011] The control part includes a heater control switch and a vehicle controller. The heater control switch is provided with a high temperature switch and a low temperature switch for controlling the temperature of the heater. The heater control switch and the vehicle controller are installed in the cab. The heater control switch is connected to the vehicle controller through a circuit. The vehicle controller is connected to the vehicle instrument through a circuit. The vehicle instrument is installed in the cab.

[0012] The first three-way solenoid valve, the PTC water pump, the PTC liquid heater, and the second three-way solenoid valve are electrically connected to the vehicle controller and controlled by the vehicle controller;

[0013] The large circulation flow sensor and the small circulation flow sensor are connected to the vehicle controller via a data line.

[0014] The control method of the heating system of the pure electric vehicle:

[0015] The PTC liquid heater is provided with a preset value range of the cooling water heating temperature in the vehicle controller, the large circulation flow sensor and the small circulation flow sensor are provided with preset flow values ​​in the vehicle controller, and the first three-way solenoid valve and the second three-way solenoid valve are switched to corresponding different connection modes through the electrical signal sent by the vehicle controller, wherein:

[0016] The large circulation flow sensor and the small circulation flow sensor need to meet the preset values ​​at the same time in the self-check state of the heating system. In the normal operation state, only the flow information received by one of the sensors meets the preset value. Otherwise, the vehicle controller determines that the heating system is abnormal, and the vehicle instrument displays an error message that the heating system is abnormal.

[0017] When in use, when the high temperature switch or low temperature switch of the heater control switch is turned on, a command is issued through the vehicle controller: the entire heater system first performs a 5-second self-test. During the self-test, the pipe connections of all components on the heater branch pipe are in an open and interconnected state, and cooling water flows through all components and removes the air in the pipe. At this time, the PTC liquid heater does not work, and the large and small circulation flow sensors are in a working state. At the 5th second, the flow information received by the large and small circulation flow sensors should meet the preset value, otherwise the self-test will be extended by 5 seconds; after the second self-test, if the flow information received by at least one of the two sensors does not meet the preset value, it is determined that the heater system is working abnormally, and the vehicle instrument displays an error message that the heater system is working abnormally; the heater system only self-checks once in a usage cycle;

[0018] When the set heating temperature is low, turn on the low temperature switch of the heating control switch. After the heating system self-check is completed, the vehicle controller issues a command: the PTC liquid heater is in a non-working state, and the pipeline between the first three-way solenoid valve and the second three-way solenoid valve is in a cut-off state; the circulation path of the cooling water is: passing through the pipeline between the water tank outlet and the water pump inlet, the first three-way solenoid valve, the PTC water pump, the PTC liquid heater, the heating water tank, the second three-way solenoid valve, the large circulation flow sensor, and returning to the pipeline between the water tank outlet and the water pump inlet;

[0019] When the set warm air temperature is high, turn on the high temperature switch of the warm air control switch. After the warm air system self-check is completed, the vehicle controller sends a command: the PTC liquid heater is in working state, the connection between the first three-way solenoid valve and the cooling circulation water circuit is cut off, the connection between the second three-way solenoid valve and the large circulation flow sensor is cut off, and the pipeline between the first three-way solenoid valve and the second three-way solenoid valve is in an open and interconnected state; the circulation path of the cooling water is: passing through the first three-way solenoid valve, PTC water pump, PTC liquid heater, warm air water tank, second three-way solenoid valve, small circulation flow sensor, and then returning to the first three-way solenoid valve. The cooling water circulates internally in the heating branch pipeline. In this process, when the cooling water temperature is lower than the preset minimum temperature of the PTC liquid heater, the PTC liquid heater starts to work, and when the cooling water exceeds the preset maximum temperature of the PTC liquid heater, the PTC liquid heater stops working; when leakage occurs and the flow cannot meet the preset value of the small circulation flow sensor, the vehicle instrument displays an error message that the warm air system is working abnormally.

[0020] Beneficial effects: The heating system of the present invention can effectively reduce the power consumption of the heating system of a pure electric vehicle, improve the cruising range, and at the same time save the layout space of the whole vehicle and facilitate the maintenance of the whole vehicle.

[0021] When the warm air temperature is set to a low level, the heat from the motor and other components is used for heating;

[0022] When the warm air temperature is set higher, an independent warm air circulation water circuit is used for heating. When the cooling water temperature is lower than the preset minimum temperature of the PTC liquid heater, the PTC liquid heater starts working. When the cooling water exceeds the preset maximum temperature of the PTC liquid heater, the PTC liquid heater stops working, thereby achieving energy saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the layout diagram of the existing vehicle cooling circulation water circuit.

[0024] Figure 2 It is a schematic structural diagram of the warm air system of the present invention.

[0025] Figure 3 It is a schematic diagram of the warm air cooling water circuit during the self-check of the warm air system of the present invention.

[0026] Figure 4 It is a schematic diagram of the warm air cooling water circuit of the warm air system of the present invention when the warm air temperature is set to be low.

[0027] Figure 5 It is a schematic diagram of the warm air cooling water circuit of the warm air system of the present invention when the warm air temperature is set to be relatively high.

[0028] Figure 6 A schematic diagram of the monitoring and control flow of the warm air system of the present invention.

[0029] As shown in the figure: 1. Auxiliary water tank; 2. Water pump; 3. Motor controller; 4. Drive motor; 5. Water tank; 6. Large circulation flow sensor; 7. Warm air water tank; 8. Second three-way solenoid valve; 9. PTC liquid heater; 10. Small circulation flow sensor; 11. PTC water pump; 12. First three-way solenoid valve. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings, but this embodiment should not be understood as limiting the present invention.

[0031] The present invention Figures 1 to 6 As shown:

[0032] A pure electric vehicle heating system includes a vehicle cooling circulation water circuit, the vehicle cooling circulation water circuit includes a water pump 2, a cooling pipeline of a motor controller 3, a cooling pipeline of a drive motor 4, and a water tank 5 which are sequentially connected through pipelines. The water outlet of the water tank 5 is connected to the water inlet of the water pump 2 through a pipeline to form a vehicle cooling circulation loop. The pipeline between the water outlet of the water tank 5 and the water inlet of the water pump 2 is connected to the water outlet of the auxiliary water tank 1 of the vehicle through a pipeline. The upper water chamber of the water tank is connected to the degassing joint of the auxiliary water tank through a pipeline. The main purpose is to realize the water supply and degassing functions of the cooling circulation water circuit through the auxiliary water tank;

[0033] A heating branch pipeline is connected in parallel on the pipeline between the water outlet of the water tank 5 and the water inlet of the water pump 2, wherein: the water inlet end of the heating branch pipeline is connected to the pipeline close to the water inlet of the water pump, and the water outlet end of the heating branch pipeline is connected to the pipeline close to the water outlet of the water tank. A monitoring system and an execution system are arranged on the heating branch pipeline. The monitoring system is used to collect signals and send the collected signals to the control system, and the control system processes the signals and issues instructions to the execution system, and the supply of high and low warm air in the cab is realized through different connection modes of the execution pipeline of the execution system;

[0034] The heating branch pipeline includes a first three-way solenoid valve 12, a PTC water pump 11, a PTC liquid heater 9 with over-temperature and over-current protection, a warm air water tank 7, and a second three-way solenoid valve 8, which are sequentially connected through pipelines between the water inlet and the water outlet, wherein the first three-way solenoid valve 12 and the second three-way solenoid valve 8 are directly connected through a pipeline, and the PTC water pump 11 is adapted to the head of the water pump 2; the first three-way solenoid valve 12, the PTC water pump 11, the PTC liquid heater 9, and the second three-way solenoid valve 8 together constitute an execution system;

[0035] The monitoring system includes a large circulation flow sensor 6, a small circulation flow sensor 10, and a vehicle instrument. The large circulation flow sensor 6 is connected in series on the pipeline between the second three-way solenoid valve 8 and the water outlet of the heating branch pipeline, and is used to monitor the flow data flowing through the pipeline and send it to the vehicle controller; the small circulation flow sensor 10 is connected in series on the pipeline between the first three-way solenoid valve 12 and the second three-way solenoid valve 8, and is used to monitor the flow data flowing through the pipeline and send it to the vehicle controller; the vehicle instrument is installed in the cab to reflect the working status of each system;

[0036] The control part includes a heater control switch and a vehicle controller. The heater control switch is provided with a high temperature switch and a low temperature switch for controlling the temperature of the heater. The heater control switch and the vehicle controller are installed in the cab. The heater control switch is connected to the vehicle controller through a circuit. The vehicle controller is connected to the vehicle instrument through a circuit. The vehicle instrument is installed in the cab.

[0037] The first three-way solenoid valve 12, the PTC water pump 11, the PTC liquid heater 9, and the second three-way solenoid valve 8 are electrically connected to the vehicle controller and controlled by the vehicle controller;

[0038] The large circulation flow sensor 6 and the small circulation flow sensor 10 are connected to the vehicle controller via a data line.

[0039] The control method of the heating system of the pure electric vehicle is as follows:

[0040] The PTC liquid heater is provided with a preset value range of the cooling water heating temperature in the vehicle controller, the large circulation flow sensor and the small circulation flow sensor are provided with preset flow values ​​in the vehicle controller, and the first three-way solenoid valve and the second three-way solenoid valve are switched to corresponding different connection modes through the electrical signal sent by the vehicle controller, wherein:

[0041] The large circulation flow sensor and the small circulation flow sensor need to meet the preset values ​​at the same time in the self-check state of the heating system. In the normal operation state, only the flow information received by one of the sensors meets the preset value. Otherwise, the vehicle controller determines that the heating system is abnormal, and the vehicle instrument displays an error message that the heating system is abnormal.

[0042] like Figure 3As shown: When in use, when the high temperature switch or low temperature switch of the heater control switch is turned on, a command is issued through the vehicle controller: the entire heater system first performs a 5-second self-test. During the self-test, the pipe connections of all components on the heater branch pipe are in an open and interconnected state, and the cooling water flows through all components and removes the air in the pipe. At this time, the PTC liquid heater does not work, and the large and small circulation flow sensors are in a working state. In the 5th second, the flow information received by the large and small circulation flow sensors should meet the preset value, otherwise the self-test will be extended by 5 seconds; after the second self-test, if the flow information received by at least one of the two sensors does not meet the preset value, it is determined that the heater system is working abnormally, and the vehicle instrument displays an error message that the heater system is working abnormally; the heater system only self-tests once in a use cycle, that is: when high temperature switches to low temperature or low temperature switches to high temperature, the self-test operation will not be repeated;

[0043] like Figure 4 As shown: when the set heating temperature is low, turn on the low temperature switch of the heating control switch. After the heating system self-check is completed, the vehicle controller issues a command: the PTC liquid heater is in a non-working state, and the pipeline between the first three-way solenoid valve and the second three-way solenoid valve is in a cut-off state; the circulation path of the cooling water is: passing through the pipeline between the water tank outlet and the water pump inlet, the first three-way solenoid valve, the PTC water pump, the PTC liquid heater, the heating water tank, the second three-way solenoid valve, the large circulation flow sensor, and returning to the pipeline between the water tank outlet and the water pump inlet;

[0044] like Figure 5 As shown: when the set warm air temperature is high, turn on the high temperature switch of the warm air control switch. After the warm air system self-check is completed, the vehicle controller issues a command: the PTC liquid heater is in working state, the connection between the first three-way solenoid valve and the cooling circulation water circuit is cut off, the connection between the second three-way solenoid valve and the large circulation flow sensor is cut off, and the pipeline between the first three-way solenoid valve and the second three-way solenoid valve is in an open and interconnected state; the circulation path of the cooling water is: passing through the first three-way solenoid valve, PTC water pump, PTC liquid heater, warm air water tank, second three-way solenoid valve, small circulation flow sensor, and then returning to the first three-way solenoid valve. The cooling water circulates internally in the heating branch pipeline. In this process, when the cooling water temperature is lower than the preset minimum temperature of the PTC liquid heater, the PTC liquid heater starts to work, and when the cooling water exceeds the preset maximum temperature of the PTC liquid heater, the PTC liquid heater stops working; when leakage occurs and the flow cannot meet the preset value of the small circulation flow sensor, the vehicle instrument displays an error message that the warm air system is working abnormally.

[0045] Parts not described in detail in this specification are well-known technologies in the art.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method for a heating system of a pure electric vehicle, wherein the heating system of the pure electric vehicle comprises a cooling circulation water circuit of the whole vehicle, wherein the cooling circulation water circuit of the whole vehicle comprises a water pump, a cooling pipeline of a motor controller, a cooling pipeline of a drive motor, and a water tank which are sequentially connected through pipelines, wherein a water outlet of the water tank and a water inlet of the water pump are connected through pipelines to form a cooling circulation loop of the whole vehicle, wherein a pipeline between the water outlet of the water tank and the water inlet of the water pump is connected to a water outlet of a secondary water tank of the whole vehicle through a pipeline, an upper water chamber of the water tank is connected to a degassing joint of the secondary water tank through a pipeline, and a heating branch pipeline is connected in parallel to the pipeline between the water outlet of the water tank and the water inlet of the water pump, wherein: The water inlet end of the heating branch pipeline is connected to the pipeline near the water inlet of the water pump, and the water outlet end of the heating branch pipeline is connected to the pipeline near the water outlet of the water tank; the heating branch pipeline is equipped with a monitoring system and an execution system, the monitoring system is used to collect signals and send the collected signals to the control system, the control system processes the signals and issues instructions to the execution system, and the high and low warm air supply in the cab is realized through different connection methods of the execution pipeline of the execution system; The heating branch pipeline includes a first three-way solenoid valve, a PTC water pump, a PTC liquid heater with over-temperature and over-current protection, a warm air water tank, and a second three-way solenoid valve, which are connected in sequence through pipelines between the water inlet and the water outlet, wherein the first three-way solenoid valve and the second three-way solenoid valve are directly connected through pipelines, and the PTC water pump is adapted to the head of the water pump; the first three-way solenoid valve, the PTC water pump, the PTC liquid heater, and the second three-way solenoid valve together constitute an execution system; The monitoring system includes a large circulation flow sensor, a small circulation flow sensor, and a vehicle instrument. The large circulation flow sensor is connected in series on the pipeline between the second three-way solenoid valve and the water outlet of the heating branch pipeline, and is used to monitor the flow data flowing through the pipeline and send it to the vehicle controller; the small circulation flow sensor is connected in series on the pipeline between the first three-way solenoid valve and the second three-way solenoid valve, and is used to monitor the flow data flowing through the pipeline and send it to the vehicle controller; the vehicle instrument is installed in the cab, and is used to reflect the working status of each system; The control part includes a heater control switch and a vehicle controller. The heater control switch is provided with a high temperature switch and a low temperature switch for controlling the temperature of the heater. The heater control switch and the vehicle controller are installed in the cab. The heater control switch is connected to the vehicle controller through a circuit. The vehicle controller is connected to the vehicle instrument through a circuit. The vehicle instrument is installed in the cab. The first three-way solenoid valve, the PTC water pump, the PTC liquid heater, and the second three-way solenoid valve are electrically connected to the vehicle controller and controlled by the vehicle controller; The large circulation flow sensor and the small circulation flow sensor are connected to the vehicle controller via a data line; It is characterized in that the control method of the heating system of the pure electric vehicle is: The PTC liquid heater is provided with a preset value range of the cooling water heating temperature in the vehicle controller, the large circulation flow sensor and the small circulation flow sensor are provided with preset flow values ​​in the vehicle controller, and the first three-way solenoid valve and the second three-way solenoid valve are switched to corresponding different connection modes through the electrical signal sent by the vehicle controller, wherein: The large circulation flow sensor and the small circulation flow sensor need to meet the preset values ​​at the same time in the self-check state of the heating system. In the normal operation state, only the flow information received by one of the sensors meets the preset value. Otherwise, the vehicle controller determines that the heating system is abnormal, and the vehicle instrument displays an error message that the heating system is abnormal. When in use, when the high temperature switch or low temperature switch of the heater control switch is turned on, a command is issued through the vehicle controller: the entire heater system first performs a 5-second self-test. During the self-test, the pipe connections of all components on the heater branch pipe are in an open and interconnected state, and cooling water flows through all components and removes the air in the pipe. At this time, the PTC liquid heater does not work, and the large and small circulation flow sensors are in a working state. At the 5th second, the flow information received by the large and small circulation flow sensors should meet the preset value, otherwise the self-test will be extended by 5 seconds; after the second self-test, if the flow information received by at least one of the two sensors does not meet the preset value, it is determined that the heater system is working abnormally, and the vehicle instrument displays an error message that the heater system is working abnormally; the heater system only self-checks once in a usage cycle; When the set heating temperature is low, turn on the low temperature switch of the heating control switch. After the heating system self-check is completed, the vehicle controller issues a command: the PTC liquid heater is in a non-working state, and the pipeline between the first three-way solenoid valve and the second three-way solenoid valve is in a cut-off state; the circulation path of the cooling water is: passing through the pipeline between the water tank outlet and the water pump inlet, the first three-way solenoid valve, the PTC water pump, the PTC liquid heater, the heating water tank, the second three-way solenoid valve, the large circulation flow sensor, and returning to the pipeline between the water tank outlet and the water pump inlet; When the set warm air temperature is high, turn on the high temperature switch of the warm air control switch. After the warm air system self-check is completed, the vehicle controller sends a command: the PTC liquid heater is in working state, the connection between the first three-way solenoid valve and the cooling circulation water circuit is cut off, the connection between the second three-way solenoid valve and the large circulation flow sensor is cut off, and the pipeline between the first three-way solenoid valve and the second three-way solenoid valve is in an open and interconnected state; the circulation path of the cooling water is: passing through the first three-way solenoid valve, PTC water pump, PTC liquid heater, warm air water tank, second three-way solenoid valve, small circulation flow sensor, and then returning to the first three-way solenoid valve. The cooling water circulates internally in the heating branch pipeline. In this process, when the cooling water temperature is lower than the preset minimum temperature of the PTC liquid heater, the PTC liquid heater starts to work, and when the cooling water exceeds the preset maximum temperature of the PTC liquid heater, the PTC liquid heater stops working; when leakage occurs and the flow cannot meet the preset value of the small circulation flow sensor, the vehicle instrument displays an error message that the warm air system is working abnormally.

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