Energy-saving control method, device and vehicle controller for pure electric vehicles

Abstract

The present invention provides an energy-saving control method, device and vehicle controller for a pure electric vehicle, belonging to the technical field of electric vehicles. The method comprises: when the vehicle is powered on, controlling the cooling fan and pump body to stop and perform a safety self-check after idling for a target time; during the vehicle driving process, when it is determined based on the water temperature signal that the motor water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit, controlling the cooling fan to start, and adjusting the operating speed of the cooling fan and the electronic water pump based on the motor water temperature. The present invention controls the cooling fan and the pump body to stop and perform a safety self-check after idling for a target time, and adjusts the operating speed of the cooling fan and the electronic water pump based on the motor water temperature, so that the main drive motor and the all-in-one controller work within a normal temperature range, thereby solving the technical problems of complicated operation and high cost of existing energy consumption reduction measures for pure electric vehicles and improving the market competitiveness of vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to an energy-saving control method and device for a pure electric vehicle and a whole vehicle controller. Background Art

[0002] At present, pure electric vehicles have been popularized in multiple scenarios in the field of commercial vehicles. Energy consumption, as a key characteristic of the vehicle, has a great impact on the vehicle's cruising range and is a key concern for users when purchasing a vehicle. The energy consumption-related systems of pure electric vehicles include chargers, power batteries, motors and motor controllers, transmission systems, wheels, body and wind resistance, and electronic and electrical systems. Among them, power batteries, motors, transmission systems, wheel side resistance, and body wind resistance are the main energy consumption systems.

[0003] For the above-mentioned major energy consumption systems, most manufacturers have adopted the following energy-saving measures: 1. Cancel OBC and adopt DC charging to reduce energy consumption when charging the power battery; 2. Adopt optimized transmission ratio, rear axle ratio and reasonable shifting strategy to make the motor operate in the high-efficiency economic zone as much as possible on a daily basis; 3. Lightweight the whole vehicle and replace it with low rolling resistance tires to reduce rolling resistance; 4. Reduce wind resistance by optimizing the body shape and chassis structure, and adopting openable and closeable shutters, electric rearview mirrors and other measures.

[0004] The above-mentioned energy-saving measures often require reducing mechanical resistance by sacrificing vehicle costs and changing the vehicle hardware structure. The operation is complicated and costly, thus affecting the vehicle's market competitiveness. Summary of the invention

[0005] In view of this, it is necessary to provide an energy-saving control method, device and vehicle controller for a pure electric vehicle to solve the technical problems of complex operation and high cost of existing energy consumption reduction measures for pure electric vehicles.

[0006] In order to solve the above problems, on the one hand, the present invention provides an energy-saving control method for a pure electric vehicle, comprising:

[0007] When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target time, then stop and perform a safety self-check;

[0008] During the driving process of the vehicle, the water temperature signal of the motor in and out is received from the feedback of the main drive motor;

[0009] When it is determined based on the water temperature signal that the motor water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speeds of the cooling fan and the electronic water pump are adjusted based on the motor water temperature, so that the main drive motor and the all-in-one controller operate within a normal temperature range.

[0010] In a possible implementation, the energy-saving control method for a pure electric vehicle further includes:

[0011] When the vehicle is running, the pump body is controlled to run at idle speed and the motor cooling water circuit is driven to circulate to remove the heat of the main drive motor and the all-in-one controller.

[0012] In a possible implementation, when the vehicle is powered on, the cooling fan and the pump are controlled to run at idle speed for a target time and then stop and perform a safety self-check, including:

[0013] When the vehicle is powered on, the cooling fan and the electronic water pump are controlled to run at idle speed for the first target time, then stop and perform a safety self-check;

[0014] When the vehicle is powered on, a first start signal and a first speed signal, as well as a second start signal and a second speed signal are sent to the all-in-one controller, so as to control the all-in-one controller to drive the electric steering pump to idle based on the first start signal and the first speed signal, and to control the all-in-one controller to drive the electric air compressor to idle based on the second start signal and the second speed signal;

[0015] After the electric steering pump and the electric air compressor have been idling for the second target time, the first stop signal and the second stop signal are sent to the all-in-one controller to control the all-in-one controller to stop the electric steering pump based on the first stop signal, and to control the all-in-one controller to stop the electric air compressor based on the second stop signal.

[0016] In a possible implementation, the energy-saving control method for a pure electric vehicle further includes:

[0017] When the vehicle is running normally and the main drive motor is working, a third start signal is sent to the all-in-one controller to control the all-in-one controller to drive the electric steering pump to rotate at the first rated speed;

[0018] When it is determined that the vehicle is traveling in a straight line and does not need to turn, a first speed adjustment signal is sent to the all-in-one controller to control the all-in-one controller to reduce the speed of the electric steering pump from the first rated speed to the second rated speed.

[0019] In a possible implementation, the energy-saving control method for a pure electric vehicle further includes:

[0020] When it is determined that the vehicle is switched to neutral and the handbrake is pulled, a second speed adjustment signal is sent to the all-in-one controller to control the all-in-one controller to reduce the speed of the electric steering pump from the second rated speed to the idle speed.

[0021] In a possible implementation, the energy-saving control method for a pure electric vehicle further includes:

[0022] When it is determined that the low-level signal in the hard line of the vehicle continues to reach the third target time or the air pressure in the air circuit is less than the first air pressure threshold, the all-in-one controller is controlled to drive the air compressor to start running until the hard line outputs a high-level signal or the air pressure in the air circuit is greater than the second air pressure threshold;

[0023] Wherein, the second air pressure threshold is greater than the first air pressure threshold.

[0024] In a possible implementation, the energy-saving control method for a pure electric vehicle further includes:

[0025] When the vehicle is driving normally and the speed is greater than a preset speed threshold, the energy recovery prohibition of the vehicle controller is released to increase the proportion of braking energy recovered by the main drive motor in the vehicle's front axle braking and rear axle braking.

[0026] In a possible implementation, the energy-saving control method for a pure electric vehicle further includes:

[0027] After the energy recovery prohibition of the vehicle controller is lifted and when the SOC value of the power battery is greater than the preset SOC threshold, the energy recovery prohibition of the main drive motor is lifted.

[0028] On the other hand, the present invention also provides an energy-saving control device for a pure electric vehicle, comprising:

[0029] The first operation control module is used to control the cooling fan and the pump body to run at idle speed for a target time and then stop and perform a safety self-check when the vehicle is powered on;

[0030] A signal receiving module, used to receive the water temperature signal of the motor in and out fed back by the main drive motor during the driving process of the vehicle;

[0031] The second operation control module is used to control the start of the cooling fan when it is determined based on the water temperature signal that the motor water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit, and adjust the operating speeds of the cooling fan and the electronic water pump based on the motor water temperature, so that the main drive motor and the all-in-one controller operate within a normal temperature range.

[0032] On the other hand, the present invention also provides a vehicle controller, including a memory and a processor, wherein:

[0033] The memory is used to store programs;

[0034] The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps of the energy-saving control method for a pure electric vehicle as described in any one of the above.

[0035] The beneficial effect of adopting the above implementation method is: when the vehicle is powered on, the cooling fan and the pump body are controlled to stop and perform a safety self-check after running at idle speed for a target time, which can reduce the consumption during the startup self-check; in addition, during the driving of the vehicle, the water temperature signal of the motor inlet and outlet fed back by the main drive motor is received, and when it is determined based on the water temperature signal that the motor water temperature of the main drive motor reaches the minimum startup limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speed of the cooling fan and the electronic water pump is adjusted based on the motor water temperature, so that the main drive motor and the all-in-one controller work within the normal temperature range, which can ensure that the main drive motor and the all-in-one controller have low operating energy consumption; the energy-saving control method of the pure electric vehicle provided by the present invention can be executed by the whole vehicle controller, that is, only the whole vehicle controller needs to be set with a program for executing the method to reduce the energy consumption of the vehicle, and there is no need to change the vehicle hardware structure to reduce mechanical resistance, and the hardware cost of the vehicle will not be increased, thereby solving the technical problems of complex operation and high cost of the existing energy consumption reduction measures for pure electric vehicles, and improving the market competitiveness of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A flow chart of an embodiment of the energy-saving control method for a pure electric vehicle provided by the present invention;

[0038] Figure 2 A hardware structure diagram related to the energy-saving control method for a pure electric vehicle provided by the present invention;

[0039] Figure 3 A principle block diagram of an embodiment of an energy-saving control device for a pure electric vehicle provided by the present invention;

[0040] Figure 4 A schematic structural diagram of an embodiment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0043] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or modules is not necessarily limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or equipment.

[0044] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0045] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] The present invention provides an energy-saving control method and device for a pure electric vehicle and a whole vehicle controller, which are described below respectively.

[0047] like Figure 1 As shown, the present invention provides an energy-saving control method for a pure electric vehicle, comprising:

[0048] S101, Combination Figure 2 , when the vehicle is powered on, the cooling fan and the pump body are controlled to run at idle speed for a target time, then stop and perform a safety self-check; the pump body may be an electronic water pump 214; the electronic water pump 214 may be an independent component in the motor cooling system, or an electronic water pump in other refrigeration systems (such as a vehicle body air conditioning system, a battery cooling system);

[0049] S102, receiving a water temperature signal of the motor input and output fed back by the main drive motor 206 during the driving process of the vehicle;

[0050] S103. When it is determined based on the water temperature signal that the motor water temperature of the main drive motor 206 reaches the minimum starting limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speeds of the cooling fan and the electronic water pump 214 are adjusted based on the motor water temperature, so that the main drive motor 206 and the all-in-one controller 205 operate within a normal temperature range.

[0051] It can be understood that the energy-saving control method for a pure electric vehicle provided by the present invention can be executed by a vehicle controller 201 (HCU). The purpose of the present invention is to optimize the software control strategy of the vehicle controller 201 to make the high and low voltage components work more efficiently, reduce unnecessary losses of high and low voltage components, and achieve energy saving and efficiency improvement.

[0052] The electric vehicle in the present invention is a pure electric vehicle equipped with a main drive motor 206, a power battery 203, a motor cooling fan, an electronic water pump 214, an electric steering pump 210 or an electric steering gear 209, and an electric air compressor 211. The operations of the above high power consumption components are all controlled by the HCU (vehicle controller 201).

[0053] The power battery 203 supplies power to the main drive motor 206 and the all-in-one controller 205 through the PDU 204 (high voltage distribution box).

[0054] The main drive motor 206 is matched with AMT208 (automatic transmission) to drive the vehicle through the transmission shaft and the drive axle.

[0055] The all-in-one controller 205 has multiple built-in control execution modules, which receive control signals from the HCU to realize power supply, start / stop and speed control of the main drive motor 206, the electric steering pump 210 and the electric air compressor 211. At the same time, the DCDC (high-low voltage conversion module) in the all-in-one controller 205 can also replenish power for the low-voltage battery 212, thereby supplying power to the electric steering gear 209, the cooling fan and the electronic water pump 214.

[0056] Motor cooling, i.e., the main function of the main drive temperature control system is to cool the main drive motor 206 and the all-in-one controller 205. The main energy-consuming electrical appliances in the cooling pipeline are the electronic fan in the radiator at the front end of the frame and the electronic water pump 214 connected in series in the water circuit. When the oil temperature in the main drive motor 206 and the all-in-one controller 205 is too high, the electronic water pump 214 and the electronic fan in the motor cooling pipeline are started under the control of the vehicle controller 201, and the coolant in the pipeline enters the main drive motor 206 and the all-in-one controller 205 for cooling after being cooled by the radiator.

[0057] The functions of the steering pump and air compressor are similar to those of traditional fuel vehicles, and are used to pressurize the steering oil circuit and the brake air circuit respectively.

[0058] The electric steering machine 209 receives the steering wheel angle requirement input, performs steering operation and feeds back the steering wheel angle information to the HCU.

[0059] The HCU, as the core control unit of the vehicle, ensures the driving safety of the vehicle while minimizing the comprehensive energy consumption of the above-mentioned high and low voltage electrical components by executing the built-in high-precision and efficient control program.

[0060] When the vehicle is powered on, the cooling fan and the pump are controlled to run at idle speed for a target time and then stop and perform a safety self-check. Specifically, when the vehicle is powered on, the electronic fan and the electronic water pump 214 in the motor cooling circuit close the low-voltage circuit under the control of the HCU, and automatically stop and perform a safety self-check after idling for 5 seconds. The first target time may be 5 seconds, and of course it may be 7 seconds in other embodiments.

[0061] When the vehicle is running, the main drive motor 206 works normally. At the same time, the main drive motor 206 feeds back the water temperature signal of the motor in and out to the HCU through the CAN line. When the motor water temperature reaches the minimum starting limit of the motor cooling water circuit, the HCU controls the cooling fan to start, and controls the operating speed of the cooling fan and the electronic water pump 214 accordingly as the motor water temperature changes, so that the main drive motor 206 and the all-in-one controller 205 work within the normal temperature range, ensuring low operating energy consumption.

[0062] In some embodiments, the energy-saving control method for a pure electric vehicle further includes:

[0063] During the driving of the vehicle, the pump body is controlled to run at idle speed and drive the motor cooling water circuit to circulate to remove the heat of the main drive motor 206 and the all-in-one controller 205; the pump body can be an electronic water pump 214.

[0064] It can be understood that the electronic water pump 214 can be an independent component in the motor cooling system, or it can be an electronic water pump in other refrigeration systems (such as the body air conditioning system, the battery cooling system); when the vehicle is driving, the main drive motor 206 works normally, and the electronic water pump 214 runs at idle speed under the control of the HCU, driving the motor cooling water circuit to circulate to remove excess heat in the main drive motor 206 and the all-in-one controller 205.

[0065] In some embodiments, when the vehicle is powered on, the cooling fan and the pump are controlled to run at idle speed for a target time and then stop and perform a safety self-check, including:

[0066] When the vehicle is powered on, the cooling fan and the electronic water pump are controlled to run at idle speed for the first target time, then stop and perform a safety self-check;

[0067] When the vehicle is powered on, a first start signal and a first speed signal, as well as a second start signal and a second speed signal are sent to the all-in-one controller 205, so as to control the all-in-one controller 205 to drive the electric steering pump 210 to run at idle speed based on the first start signal and the first speed signal, and to control the all-in-one controller 205 to drive the electric air compressor 211 to run at idle speed based on the second start signal and the second speed signal;

[0068] After the electric steering pump 210 and the electric air compressor 211 idle for the second target time, the first stop signal and the second stop signal are sent to the all-in-one controller 205 to control the all-in-one controller 205 to stop the electric steering pump 210 based on the first stop signal, and to control the all-in-one controller 205 to stop the electric air compressor 211 based on the second stop signal.

[0069] It is understandable that the second target duration may be the same as or different from the first target duration mentioned above. For example, the second target duration may be 5 seconds. Specifically, when the vehicle is powered on, the HCU sends the start and speed signals of the electric steering pump 210 and the electric air compressor 211 to the all-in-one controller 205, and the all-in-one controller 205 enables the steering pump and the motor in the air compressor to run at idle speed. After running for 5 seconds, the HCU stops sending the start signal, and the all-in-one controller 205 disconnects the input current of the steering pump and the air compressor accordingly, and both stop working.

[0070] In some embodiments, the energy-saving control method for a pure electric vehicle further includes:

[0071] When the vehicle is running normally and the main drive motor 206 is working, a third start signal is sent to the all-in-one controller 205 to control the all-in-one controller 205 to drive the electric steering pump 210 to rotate at the first rated speed;

[0072] When it is determined that the vehicle is traveling in a straight line and does not need to turn, a first speed adjustment signal is sent to the all-in-one controller 205 to control the all-in-one controller 205 to reduce the speed of the electric steering pump 210 from the first rated speed to the second rated speed.

[0073] It is understandable that in this embodiment, the first rated speed may be 1500 rpm, and the second rated speed may be 1200 rpm. Specifically, when the vehicle is running normally and the main drive motor 206 is working, the HCU sends a start signal to control the all-in-one controller 205 to energize the steering pump and drive it to rotate at the rated speed (1500 rpm). When the HCU built-in driving behavior analysis program finds that the vehicle is driving nearly straight and does not need to turn through the feedback angle information of the electric steering gear 209, the operating speed of the electric steering pump 210 is reduced from 1500 rpm to 1200 rpm.

[0074] In some embodiments, the energy-saving control method for a pure electric vehicle further includes:

[0075] When it is determined that the vehicle is switched to neutral and the handbrake is pulled, a second speed adjustment signal is sent to the all-in-one controller 205 to control the all-in-one controller 205 to reduce the speed of the electric steering pump 210 from the second rated speed to the idle speed.

[0076] It is understandable that when the driver puts the vehicle in neutral and applies the handbrake, the HCU controls the steering pump to reduce its speed to idle speed (eg, 500 rpm), thereby minimizing the energy consumption of the steering pump and the electric steering gear 209 while ensuring the normal steering function of the vehicle.

[0077] In some embodiments, the energy-saving control method for a pure electric vehicle further includes:

[0078] When it is determined that the low-level signal in the hard line of the vehicle continues to reach the third target time or the air pressure in the air circuit is less than the first air pressure threshold, the all-in-one controller 205 is controlled to drive the air compressor to start running until the hard line outputs a high-level signal or the air pressure in the air circuit is greater than the second air pressure threshold;

[0079] Wherein, the second air pressure threshold is greater than the first air pressure threshold.

[0080] It is understandable that the first air pressure threshold in this embodiment can be 8 bar, the second air pressure threshold can be 10 bar, and the third target duration can be 1 minute. The operation of the air compressor is controlled by the air pressure signal in the hard line of the air pressure switch 215 and the CAN line. When the low level in the hard line lasts for 1 minute or the air pressure in the air circuit is less than 8 bar, the HCU controls the air compressor control module in the all-in-one controller 205 to enable and drive the air compressor to start running until the hard line outputs a high level or the air pressure is higher than 10 bar.

[0081] In some embodiments, the energy-saving control method for a pure electric vehicle further includes:

[0082] When the vehicle is running normally and the speed is greater than a preset speed threshold, the energy recovery prohibition of the vehicle controller 201 is released to increase the proportion of braking energy recovered by the main drive motor 206 in the front axle braking and rear axle braking of the vehicle.

[0083] It is understandable that the preset vehicle speed threshold can be 6km / h. During normal driving of the vehicle on the road, when the vehicle speed is greater than 6km / h, the HCU releases the energy recovery ban and greatly increases the proportion of braking energy recovered by the main drive motor 206 in front and rear axle braking while ensuring safe driving.

[0084] In some embodiments, the energy-saving control method for a pure electric vehicle further includes:

[0085] After the energy recovery prohibition of the vehicle controller 201 is released and when the SOC (battery state of charge) value of the power battery 203 is greater than a preset SOC threshold, the energy recovery prohibition of the main drive motor 206 is released.

[0086] It is understandable that during normal driving of the vehicle on the road, when the vehicle speed is greater than 6km / h, the HCU releases the energy recovery ban and, on the premise of ensuring safe driving, also allows the main drive motor 206 to recover energy when the SOC of the power battery 203 is close to 100%, thereby maximizing the recovery and utilization of mechanical energy.

[0087] In one embodiment, in view of the electrical energy consumption loophole mentioned above, the present invention optimizes the control strategies of pure electric vehicle starting, driving process and energy recovery through scene big data analysis, driver habit fitting, energy flow simulation, drum test, vehicle calibration and debugging, etc. as follows:

[0088] 1. When the vehicle is started (i.e., the vehicle is powered on), the HCU controls the cooling fan, the electronic water pump 214, the electric steering pump 210, the electric steering gear 209, and the motors in the brake air compressor to run at idle speed for 5 seconds and then stop, so as to minimize the loss during the startup self-test.

[0089] 2. Optimize the motor output control strategy when the vehicle is driving. When the driving speed is greater than 40km / h, the HCU limits the motor output torque to less than 70% of the peak torque to ensure that the motor always works in the high-efficiency economic zone;

[0090] 3. Optimize the steering control strategy in the HCU. When the vehicle is traveling in a straight line without turning, appropriately reduce the operating speed of the electric steering pump 210 from 1500rpm to 1200rpm; when the vehicle is in neutral and the handbrake is applied, the steering pump speed is reduced to idle speed; while ensuring the normal steering function of the vehicle, the energy consumption of the steering motor is reduced as much as possible.

[0091] 4. Optimize the brake control strategy: adjust the brake air pressure working range from [8bar, 9bar] to [8bar, 10bar] to increase the redundancy of air pressure changes. This is to prevent the frequent pumping and exhausting of the vehicle when the air pressure fluctuates violently during the driving process of the vehicle - the air compressor works to pump air when the air pressure is lower than 8bar, and the valve body exhausts air when the air pressure is higher than 9bar - energy saving and noise reduction.

[0092] 5. Under the premise of ensuring the normal and safe driving of the vehicle, the probability and proportion of braking energy recovery during vehicle driving will be increased: the minimum vehicle speed range allowing braking energy recovery will be reduced from [10km / h, 15km / h] to [6 km / h, 10 km / h], and both the front and rear axles will be allowed to participate in braking energy recovery, maximizing the recovery of mechanical energy and reducing the power consumption of energy storage components.

[0093] 6. When using pure electric vehicles on plains or in cities, according to big data statistics, there are basically no working conditions that require continuous braking, such as heavy-load long downhill driving. The vehicle control strategy has cancelled the original clause that does not allow the motor to reverse and replace mechanical braking when the power battery 203SOC ≥ 80%, further increasing the chance of energy recovery.

[0094] In some embodiments, the implementation of the main drive temperature control strategy: when the vehicle is powered on, the electronic fan and electronic water pump 214 in the motor cooling circuit close the low-voltage circuit under the control of the HCU, and automatically stop for safety self-check after idling for 5 seconds. When the vehicle is driving and the main drive motor 206 is working normally, the electronic water pump 214 is idling under the control of the HCU, driving the motor cooling water circuit to circulate to take away the excess heat in the main drive motor 206 and the all-in-one controller 205. At the same time, the main drive motor 206 feeds back the water temperature signal of the motor in and out to the HCU through the CAN line. When the motor water temperature reaches the minimum starting limit of the motor cooling water circuit, the HCU controls the cooling fan to start, and controls the working speed of the cooling fan and the electronic water pump 214 accordingly as the motor water temperature changes, so that the main drive motor 206 and the all-in-one controller 205 work within the normal temperature range to ensure low operating energy consumption.

[0095] In some embodiments, the auxiliary drive control strategy is implemented as follows: when the vehicle is powered on, the HCU sends a start and speed signal of the electric steering pump 210 and the electric air compressor 211 to the all-in-one controller 205, and the all-in-one controller 205 enables the steering pump and the motor in the air compressor to run at idle speed. After running for 5 seconds, the HCU stops sending the start signal, and the all-in-one controller 205 disconnects the input current of the steering pump and the air compressor accordingly, and both stop working. When the vehicle is driving normally and the main drive motor 206 is working, the HCU sends a start signal to control the all-in-one controller 205 to energize the steering pump and drive it to rotate at the rated speed (1500rpm). When the HCU built-in driving behavior analysis program finds that the vehicle is driving nearly straight and does not need to turn through the feedback angle information of the electric steering gear 209, the operating speed of the electric steering pump 210 is reduced from 1500rpm to 1200rpm; when the driver puts the gear in neutral and pulls the handbrake, the HCU controls the steering pump speed to reduce to idle speed (such as 500rpm) to ensure the normal steering function of the vehicle while minimizing the energy consumption of the steering pump and the electric steering gear 209. The operation of the air compressor is controlled by the air pressure signal in the hard line of the air pressure switch 215 and the CAN line (controller area network bus). When the low level in the hard line lasts for 1 minute or the air pressure in the air line is less than 8bar, the HCU controls the air compressor control module in the all-in-one controller 205 to enable and drive the air compressor to start running until the hard line outputs a high level or the air pressure is higher than 10bar.

[0096] In some embodiments, the energy recovery control strategy is implemented as follows: during normal driving of the vehicle on the road, when the vehicle speed is greater than 6 km / h, the HCU releases the energy recovery ban, and greatly increases the proportion of braking energy recovered by the main drive motor 206 in front and rear axle braking while ensuring safe driving. At the same time, when the SOC of the power battery 203 is close to 100%, the main drive motor 206 is also allowed to recover energy, thereby maximizing the recovery and utilization of mechanical energy.

[0097] To summarize, the energy-saving control method for a pure electric vehicle provided by the present invention includes: when the vehicle is powered on, controlling the cooling fan and the pump body to run at idle speed for a target period of time and then stop and perform a safety self-check; during vehicle driving, receiving the water temperature signal of the motor inlet and outlet fed back by the main drive motor 206; when it is determined based on the water temperature signal that the motor water temperature of the main drive motor 206 reaches the minimum starting limit of the motor cooling water circuit, controlling the cooling fan to start, and adjusting the operating speed of the cooling fan and the electronic water pump 214 based on the motor water temperature, so that the main drive motor 206 and the all-in-one controller 205 operate within a normal temperature range.

[0098] The energy-saving control method for a pure electric vehicle provided by the present invention controls the cooling fan and the pump body to run at idle speed for a target time and then stop and perform a safety self-check when the vehicle is powered on, so as to reduce the consumption during the startup self-check; in addition, during the driving process of the vehicle, a water temperature signal of the motor inlet and outlet fed back by the main drive motor 206 is received, and when it is determined based on the water temperature signal that the motor water temperature of the main drive motor 206 reaches the minimum startup limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speeds of the cooling fan and the electronic water pump 214 are adjusted based on the motor water temperature, so that the main drive motor 206 and the multi-motor 206 can be started at a minimum startup limit of the motor cooling water circuit. The all-in-one controller 205 operates within a normal temperature range, which can ensure that the main drive motor 206 and the all-in-one controller 205 have low operating energy consumption; the energy-saving control method for pure electric vehicles provided by the present invention can be executed by the whole vehicle controller 201, that is, only the whole vehicle controller 201 needs to be set with a program for executing the method to reduce the energy consumption of the vehicle, and there is no need to change the vehicle hardware structure to reduce mechanical resistance, and the hardware cost of the vehicle will not be increased, thereby solving the technical problems of complex operation and high cost of existing energy consumption reduction measures for pure electric vehicles and improving the market competitiveness of vehicles.

[0099] By adopting the above method, the energy consumption of high and low voltage electrical components in pure electric vehicles can be reduced by 7%-8%, which has made a significant contribution to improving vehicle range and solving users' mileage anxiety.

[0100] like Figure 3 As shown, the present invention also provides an energy-saving control device 300 for a pure electric vehicle, comprising:

[0101] The first operation control module 301 is used to control the cooling fan and the pump body to run at idle speed for a target time and then stop and perform a safety self-check when the vehicle is powered on;

[0102] The signal receiving module 302 is used to receive the water temperature signal of the motor in and out fed back by the main drive motor 206 during the driving process of the vehicle;

[0103] The second operation control module 303 is used to control the start of the cooling fan when it is determined based on the water temperature signal that the motor water temperature of the main drive motor 206 reaches the minimum starting limit of the motor cooling water circuit, and adjust the operating speed of the cooling fan and the electronic water pump 214 based on the motor water temperature, so that the main drive motor 206 and the all-in-one controller 205 operate within a normal temperature range.

[0104] The energy-saving control device of the pure electric vehicle provided by the present invention controls the cooling fan and the pump body to stop and perform a safety self-check after idling for a target time when the vehicle is powered on, thereby reducing the consumption during the startup self-check; in addition, during the driving of the vehicle, the water temperature signal of the motor inlet and outlet fed back by the main drive motor is received, and when it is determined based on the water temperature signal that the motor water temperature of the main drive motor reaches the minimum startup limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speed of the cooling fan and the electronic water pump is adjusted based on the motor water temperature, so that the main drive motor and the all-in-one controller work within the normal temperature range, thereby ensuring that the main drive motor and the all-in-one controller have low operating energy consumption; the energy-saving control method of the pure electric vehicle provided by the present invention can be executed by the whole vehicle controller, that is, only the whole vehicle controller needs to be set with a program for executing the method to reduce the energy consumption of the vehicle, and there is no need to change the vehicle hardware structure to reduce mechanical resistance, and the hardware cost of the vehicle will not be increased, thereby solving the technical problems of complex operation and high cost of existing energy consumption reduction measures for pure electric vehicles, thereby improving the market competitiveness of the vehicle.

[0105] The energy-saving control device for a pure electric vehicle provided in the above embodiment can implement the technical solution described in the above embodiment of the energy-saving control method for a pure electric vehicle. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above embodiment of the energy-saving control method for a pure electric vehicle, which will not be repeated here.

[0106] like Figure 4 As shown, the present invention also provides an electronic device 400 , which may be a vehicle controller. The electronic device 400 includes a processor 401 , a memory 402 and a display 403 . Figure 4 Only some components of the electronic device 400 are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0107] In some embodiments, the memory 402 may be an internal storage unit of the electronic device 400, such as a hard disk or memory of the electronic device 400. In other embodiments, the memory 402 may also be an external storage device of the electronic device 400, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., equipped on the electronic device 400.

[0108] Furthermore, the memory 402 may include both an internal storage unit of the electronic device 400 and an external storage device. The memory 402 is used to store application software installed in the electronic device 400 and various data.

[0109] In some embodiments, the processor 401 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 402, such as the energy-saving control method for pure electric vehicles in the present invention.

[0110] In some embodiments, the display 403 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 403 is used to display information on the electronic device 400 and to display a visual user interface. The components 401-403 of the electronic device 400 communicate with each other via a system bus.

[0111] In some embodiments of the present invention, when the processor 401 executes the energy-saving control program of the pure electric vehicle in the memory 402, the following steps may be implemented:

[0112] When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target time, then stop and perform a safety self-check;

[0113] During the driving process of the vehicle, a water temperature signal of the motor inlet and outlet fed back by the main drive motor 206 is received;

[0114] When it is determined based on the water temperature signal that the motor water temperature of the main drive motor 206 reaches the minimum starting limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speeds of the cooling fan and the electronic water pump 214 are adjusted based on the motor water temperature, so that the main drive motor 206 and the all-in-one controller 205 operate within a normal temperature range.

[0115] It should be understood that: when the processor 401 executes the energy-saving control program of the pure electric vehicle in the memory 402, in addition to the above functions, other functions can also be realized. For details, please refer to the description of the corresponding method embodiment above.

[0116] Furthermore, the embodiment of the present invention does not specifically limit the type of the electronic device 400 mentioned, and the electronic device 400 may be a portable electronic device such as a mobile phone, a tablet computer, a personal digital assistant (PDA), a wearable device, a laptop computer, etc. Exemplary embodiments of portable electronic devices include but are not limited to portable electronic devices equipped with IOS, Android, Microsoft or other operating systems. The above-mentioned portable electronic device may also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, the electronic device 400 may not be a portable electronic device, but a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0117] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the energy-saving control method for a pure electric vehicle provided by the above methods is implemented, and the method includes:

[0118] When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target time, then stop and perform a safety self-check;

[0119] During the driving process of the vehicle, a water temperature signal of the motor inlet and outlet fed back by the main drive motor 206 is received;

[0120] When it is determined based on the water temperature signal that the motor water temperature of the main drive motor 206 reaches the minimum starting limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speeds of the cooling fan and the electronic water pump 214 are adjusted based on the motor water temperature, so that the main drive motor 206 and the all-in-one controller 205 operate within a normal temperature range.

[0121] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0122] The energy-saving control method, device and vehicle controller 201 of the pure electric vehicle provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for energy saving control of a pure electric vehicle, characterized in that: include: When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target time, then stop and perform a safety self-check; During the driving process of the vehicle, the water temperature signal of the motor in and out is received from the feedback of the main drive motor; When it is determined based on the water temperature signal that the motor water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speeds of the cooling fan and the electronic water pump are adjusted based on the motor water temperature, so that the main drive motor and the all-in-one controller operate within a normal temperature range; The method further comprises: When the vehicle is running, the pump body is controlled to run at idle speed and the motor cooling water circuit is driven to circulate to remove the heat of the main drive motor and the all-in-one controller; When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target time, then stop and perform a safety self-check, including: When the vehicle is powered on, the cooling fan and the electronic water pump are controlled to run at idle speed for the first target time, then stop and perform a safety self-check; When the vehicle is powered on, a first start signal and a first speed signal, as well as a second start signal and a second speed signal are sent to the all-in-one controller, so as to control the all-in-one controller to drive the electric steering pump to idle based on the first start signal and the first speed signal, and to control the all-in-one controller to drive the electric air compressor to idle based on the second start signal and the second speed signal; After the electric steering pump and the electric air compressor have been idling for the second target time, the first stop signal and the second stop signal are sent to the all-in-one controller to control the all-in-one controller to stop the electric steering pump based on the first stop signal, and to control the all-in-one controller to stop the electric air compressor based on the second stop signal.

2. The energy-saving control method for a pure electric vehicle according to claim 1, characterized in that: Also includes: When the vehicle is running normally and the main drive motor is working, a third start signal is sent to the all-in-one controller to control the all-in-one controller to drive the electric steering pump to rotate at the first rated speed; When it is determined that the vehicle is traveling in a straight line and does not need to turn, a first speed adjustment signal is sent to the all-in-one controller to control the all-in-one controller to reduce the speed of the electric steering pump from the first rated speed to the second rated speed.

3. The energy-saving control method for a pure electric vehicle according to claim 2, characterized in that: Also includes: When it is determined that the vehicle is switched to neutral and the handbrake is pulled, a second speed adjustment signal is sent to the all-in-one controller to control the all-in-one controller to reduce the speed of the electric steering pump from the second rated speed to the idle speed.

4. The energy-saving control method for a pure electric vehicle according to claim 3, characterized in that: Also includes: When it is determined that the low-level signal in the hard line of the vehicle continues to reach the third target time or the air pressure in the air circuit is less than the first air pressure threshold, the all-in-one controller is controlled to drive the air compressor to start running until the hard line outputs a high-level signal or the air pressure in the air circuit is greater than the second air pressure threshold; Wherein, the second air pressure threshold is greater than the first air pressure threshold.

5. The energy-saving control method for a pure electric vehicle according to any one of claims 1 to 4, characterized in that: Also includes: When the vehicle is driving normally and the speed is greater than a preset speed threshold, the energy recovery prohibition of the vehicle controller is released to increase the proportion of braking energy recovered by the main drive motor in the vehicle's front axle braking and rear axle braking.

6. The energy-saving control method for a pure electric vehicle according to claim 5, characterized in that: Also includes: After the energy recovery prohibition of the vehicle controller is lifted and when the SOC value of the power battery is greater than the preset SOC threshold, the energy recovery prohibition of the main drive motor is lifted.

7. An energy-saving control device for a pure electric vehicle, characterized in that: include: The first operation control module is used to control the cooling fan and the pump body to run at idle speed for a target time and then stop and perform a safety self-check when the vehicle is powered on; A signal receiving module, used to receive the water temperature signal of the motor in and out fed back by the main drive motor during the driving process of the vehicle; a second operation control module, for controlling the cooling fan to start when it is determined based on the water temperature signal that the motor water temperature of the main drive motor reaches the minimum start limit of the motor cooling water circuit, and adjusting the operating speeds of the cooling fan and the electronic water pump based on the motor water temperature, so that the main drive motor and the all-in-one controller operate within a normal temperature range; The device also includes: The third operation control module is used to control the pump body to run at idle speed and drive the motor cooling water circuit to circulate during the vehicle driving process to remove the heat of the main drive motor and the all-in-one controller; When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target time, then stop and perform a safety self-check, including: When the vehicle is powered on, the cooling fan and the electronic water pump are controlled to run at idle speed for the first target time, then stop and perform a safety self-check; When the vehicle is powered on, a first start signal and a first speed signal, as well as a second start signal and a second speed signal are sent to the all-in-one controller, so as to control the all-in-one controller to drive the electric steering pump to idle based on the first start signal and the first speed signal, and to control the all-in-one controller to drive the electric air compressor to idle based on the second start signal and the second speed signal; After the electric steering pump and the electric air compressor have been idling for the second target time, the first stop signal and the second stop signal are sent to the all-in-one controller to control the all-in-one controller to stop the electric steering pump based on the first stop signal, and to control the all-in-one controller to stop the electric air compressor based on the second stop signal.

8. A vehicle controller, characterized in that: comprising a memory and a processor, wherein: The memory is used to store programs; The processor is coupled to the memory and is used to execute the program stored in the memory to implement the steps of the energy-saving control method for a pure electric vehicle as described in any one of claims 1 to 6.

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