Energy-saving control method and apparatus for battery electric vehicle, and vehicle control unit

Abstract

An energy-saving control method and apparatus for a battery electric vehicle, and a vehicle control unit, relating to the technical field of electric vehicles. The energy-saving control method comprises: when a vehicle is powered on, controlling a cooling fan and an electronic water pump to run at an idle speed for a target duration, and then stopping to perform a safety self-check; upon determining, on the basis of a water temperature signal, that a motor water temperature of a main drive motor has reached a minimum starting threshold of a motor cooling water circuit during a driving process of the vehicle, controlling the cooling fan to start, and adjusting operating speeds of the cooling fan and the electronic water pump on the basis of the motor water temperature. Controlling the cooling fan and the electronic water pump to run at an idle speed for a target duration and then stopping to perform a safety self-check, and then adjusting the operating speeds of the cooling fan and the electronic water pump on the basis of the water temperature of the motor, and thus ensuring the main drive motor and an all-in-one control unit run within a normal temperature range, solves the technical problems of complex operation and high costs in existing energy consumption reduction measures for battery electric vehicles, and improves the competitiveness of the vehicle market.

Description

Energy-saving control methods, devices and vehicle controllers for pure electric vehicles Technical Field

[0001] This invention relates to the field of electric vehicle technology, specifically to an energy-saving control method, device, and vehicle controller for a pure electric vehicle. Background Technology

[0002] Currently, pure electric vehicles have achieved widespread adoption in multiple scenarios within the commercial vehicle sector. Energy consumption, as a key characteristic of the entire vehicle, significantly impacts its driving range and is a major concern for consumers when purchasing a vehicle. The energy-related systems of pure electric vehicles include the charger, power battery, motor and motor controller, transmission system, wheels, body and aerodynamic resistance, and electronic and electrical systems. Among these, the power battery, motor, transmission system, wheel resistance, and body aerodynamic resistance are the primary energy-consuming systems.

[0003] For the aforementioned major energy-consuming systems, most manufacturers have adopted the following energy-saving measures: 1. Eliminating OBC and adopting DC charging to reduce energy consumption during power battery charging; 2. Using optimized transmission ratios, rear axle ratios, and reasonable shifting strategies to ensure that the motor operates in the most efficient and economical range as much as possible during daily use; 3. Lightening the vehicle and replacing it with low rolling resistance tires to reduce rolling resistance; 4. Reducing wind resistance by optimizing the vehicle body shape and chassis structure, and adopting measures such as openable louvers and electric rearview mirrors.

[0004] The aforementioned energy-saving measures often require sacrificing vehicle costs and altering vehicle hardware structure to reduce mechanical resistance, which is complex 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 pure electric vehicles to solve the technical problems of complex operation and high cost of existing energy-saving measures for pure electric vehicles.

[0006] To address the aforementioned problems, this invention provides an energy-saving control method for pure electric vehicles, comprising:

[0007] When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target duration before stopping and performing a safety self-check.

[0008] During vehicle operation, it receives water temperature signals from the main drive motor, which are fed back from the motor's inlet and outlet.

[0009] When the water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit based on the water temperature signal, 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 water temperature of the motor so that the main drive motor and the all-in-one controller can work within the normal temperature range.

[0010] In one possible implementation, the energy-saving control method for pure electric vehicles also includes:

[0011] During vehicle operation, the control pump runs at idle speed and drives the motor cooling water circuit to circulate, thereby removing heat from the main drive motor and the all-in-one controller.

[0012] In one possible implementation, when the vehicle is powered on, the cooling fan and pump are controlled to idle at a target speed for a target duration before stopping and performing a safety self-check, including:

[0013] When the vehicle is powered on, the cooling fan and electric water pump are controlled to run at idle speed for the first target duration before stopping and performing 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 multi-in-one controller to control the multi-in-one controller to drive the electric power steering pump to idle speed based on the first start signal and the first speed signal, and to control the multi-in-one controller to drive the electric air compressor to idle speed based on the second start signal and the second speed signal.

[0015] After the electric power steering pump and electric air compressor have been idling for a second target duration, a first stop signal and a second stop signal are sent to the multi-function controller. The multi-function controller is then controlled to stop the electric power steering pump based on the first stop signal and to stop the electric air compressor based on the second stop signal.

[0016] In one possible implementation, the energy-saving control method for pure electric vehicles also includes:

[0017] When the vehicle is driving normally and the main drive motor is working, a third start signal is sent to the multi-function controller to control the multi-function controller to drive the electric power steering pump to rotate at the first rated speed.

[0018] When it is determined that the vehicle is traveling in a straight line and no steering is required, a first speed adjustment signal is sent to the multi-function controller to control the multi-function controller to reduce the speed of the electric power steering pump from the first rated speed to the second rated speed.

[0019] In one possible implementation, the energy-saving control method for pure electric vehicles also includes:

[0020] Once it is confirmed that the vehicle is shifted to neutral and the handbrake is engaged, a second speed adjustment signal is sent to the multi-function controller to control the multi-function controller to reduce the speed of the electric power steering pump from the second rated speed to idle speed.

[0021] In one possible implementation, the energy-saving control method for pure electric vehicles also includes:

[0022] If the low-level signal in the hard wire of the vehicle continues to reach the third target duration or the air pressure in the air circuit is less than the first air pressure threshold, the multi-in-one controller is controlled to drive the air compressor to start running until the hard wire 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 one possible implementation, the energy-saving control method for pure electric vehicles also includes:

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

[0026] In one possible implementation, the energy-saving control method for pure electric vehicles also includes:

[0027] After the energy recovery restriction of the vehicle controller is lifted and the SOC value of the power battery is greater than the preset SOC threshold, the energy recovery restriction 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 pump 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] The signal receiving module is used to receive the water temperature signal fed back by the main drive motor from the motor during vehicle operation.

[0031] The second operation control module is used to control the cooling fan to start when the motor water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit based on the water temperature signal, and to adjust 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 multi-in-one controller can operate within the 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, coupled to the memory, 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 of the above.

[0035] The beneficial effects of the above implementation method are as follows: When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target time and then stop and perform a safety self-check, which can reduce the consumption during the start-up self-check; In addition, during vehicle operation, the water temperature signal of the motor inlet and outlet is received from the main drive motor. When it is determined based on the water temperature signal that the motor water temperature of the main drive motor has reached the minimum start-up limit of the motor cooling water circuit, the cooling fan is controlled to start, and the operating speed of the cooling fan and the electric water pump is adjusted based on the motor water temperature, so that the main drive motor and the multi-in-one controller operate within the normal temperature range, which can ensure that the operating energy consumption of the main drive motor and the multi-in-one controller is low; The energy-saving control method for pure electric vehicles provided by this invention can be executed by the vehicle controller. That is, only the program for executing the method needs to be set on the vehicle controller to reduce the energy consumption of the vehicle. It does not require changing the vehicle hardware structure to reduce mechanical resistance and will not increase the hardware cost of the vehicle. This solves the technical problems of complex operation and high cost of existing energy-saving measures for pure electric vehicles, and improves the market competitiveness of the vehicle. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying 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 effort.

[0037] Figure 1 is a flowchart of an embodiment of the energy-saving control method for pure electric vehicles provided by the present invention;

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

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

[0040] Figure 4 is a schematic diagram of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0042] In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0043] In this embodiment of the invention, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, apparatus, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to such process, method, product or device.

[0044] The naming or numbering of 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 order 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 effect can be achieved.

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

[0046] This invention provides an energy-saving control method, device, and vehicle controller for pure electric vehicles, which will be described below.

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

[0048] S101. Referring to Figure 2, when the vehicle is powered on, the cooling fan and pump body are controlled to run at idle speed for a target time and then stop and perform a safety self-check; the pump body can be an electronic water pump 214; 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 vehicle air conditioning system, battery cooling system).

[0049] S102. During vehicle operation, receive the water temperature signal fed back by the main drive motor 206 for the motor inlet and outlet.

[0050] S103. When it is determined from the water temperature signal that the motor water temperature of the main drive motor 206 has reached the minimum starting 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 214 is adjusted based on the motor water temperature so that the main drive motor 206 and the all-in-one controller 205 can work within the normal temperature range.

[0051] It is understood that the energy-saving control method for pure electric vehicles provided by the present invention can be executed by the 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 effectively, reduce unnecessary high and low voltage losses, and achieve energy saving and efficiency improvement.

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

[0053] The power battery 203 supplies power to the main drive motor 206 and the multi-function controller 205 via the PDU204 (high voltage distribution box).

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

[0055] The all-in-one controller 205 has multiple built-in control execution modules. It receives control signals from the HCU to power the main drive motor 206, electric steering pump 210, and electric air compressor 211, as well as control their start / stop and speed. At the same time, the DC-DC (high-low voltage conversion module) in the all-in-one controller 205 can also replenish the low-voltage battery 212, thereby powering the electric steering gear 209, cooling fan, and electric water pump 214.

[0056] The motor cooling system, also known as the main drive temperature control system, primarily cools the main drive motor 206 and the multi-function controller 205. The main energy-consuming electrical components in the cooling system are the electric fan inside the front radiator of the chassis and the electric water pump 214 connected in series in the water circuit. When the oil temperature inside the main drive motor 206 and the multi-function controller 205 is too high, the electric water pump 214 and the electric fan in the motor cooling system are activated under the control of the vehicle controller 201. The coolant in the system, after being cooled by the radiator, enters the main drive motor 206 and the multi-function controller 205 for cooling.

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

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

[0059] As the core control unit of the vehicle, the HCU ensures the vehicle's driving safety while minimizing the overall energy consumption of the aforementioned high and low voltage electrical components by executing a built-in high-precision and high-efficiency control program.

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

[0061] When the vehicle is in motion, the main drive motor 206 operates normally. At the same time, the main drive motor 206 feeds back the water temperature signal of the motor inlet and outlet to the HCU via 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. As the motor water temperature changes, the HCU controls the operating speed of the cooling fan and the electronic water pump 214 accordingly, so that the main drive motor 206 and the multi-function controller 205 operate within the normal temperature range, ensuring low operating energy consumption.

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

[0063] During vehicle operation, the control pump runs at idle speed and drives the motor cooling water circuit to circulate, so as to remove the heat of the main drive motor 206 and the multi-function controller 205; the pump body can be an electronic water pump 214.

[0064] It is understandable 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 vehicle air conditioning system or the battery cooling system). When the vehicle is in motion, the main drive motor 206 is working normally, and the electronic water pump 214 is idling under the control of the HCU, driving the motor cooling water circuit to circulate and remove excess heat from the main drive motor 206 and the multi-function controller 205.

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

[0066] When the vehicle is powered on, the cooling fan and electric water pump are controlled to run at idle speed for the first target duration before stopping and performing 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 multi-function controller 205 to control the multi-function controller 205 to drive the electric power steering pump 210 to idle speed based on the first start signal and the first speed signal, and to control the multi-function controller 205 to drive the electric air compressor 211 to idle speed based on the second start signal and the second speed signal.

[0068] After the electric power steering pump 210 and electric air compressor 211 have been idling for a second target duration, a first stop signal and a second stop signal are sent to the multi-function controller 205 to stop the electric power steering pump 210 based on the first stop signal and to stop the electric air compressor 211 based on the second stop signal.

[0069] Understandably, the second target duration can be the same as or different from the first target duration mentioned above; for example, the second target duration could be 5 seconds. Specifically, when the vehicle is powered on, the HCU sends start and speed signals to the all-in-one controller 205 for the electric power steering pump 210 and the electric air compressor 211. The all-in-one controller 205 then enables the motors inside the power steering pump and air compressor to idle. After 5 seconds of operation, the HCU stops sending start signals, and the all-in-one controller 205 accordingly disconnects the input current to the power steering pump and air compressor, causing both to stop working.

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

[0071] When the vehicle is driving normally and the main drive motor 206 is working, a third start signal is sent to the multi-function controller 205 to control the multi-function controller 205 to drive the electric power 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 no steering is required, a first speed adjustment signal is sent to the multi-function controller 205 to control the multi-function 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 understood that in this embodiment, the first rated speed can be 1500 rpm and the second rated speed can be 1200 rpm. Specifically, 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 power the steering pump, driving it to rotate at the rated speed (1500 rpm). When the HCU's built-in driving behavior analysis program detects through the angle information fed back by the electric steering gear 209 that the vehicle is driving in a near-straight line and does not need to turn, it reduces the operating speed of the electric steering pump 210 from 1500 rpm to 1200 rpm.

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

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

[0076] Understandably, when the driver shifts to neutral and engages the handbrake, the HCU controls the steering pump speed to idle (e.g., 500 rpm) to minimize energy consumption of the steering pump and electric steering gear 209 while ensuring the vehicle's normal steering function.

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

[0078] If the low-level signal in the hard wire of the vehicle continues to reach the third target duration or the air pressure in the air circuit is less than the first air pressure threshold, the multi-in-one controller 205 is controlled to drive the air compressor to start running until the hard wire 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 understood that in this embodiment, the first air pressure threshold 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 both the hard wire and the air pressure signal in the CAN line of the air pressure switch 215. When the low level in the hard wire lasts for 1 minute or the air pressure in the air path is less than 8 bar, the air compressor control module in the HCU control all-in-one controller 205 is activated, driving the air compressor to start running until the hard wire outputs a high level or the air pressure is higher than 10 bar.

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

[0082] When the vehicle is driving normally and the speed is greater than the preset speed threshold, the energy recovery restriction of the vehicle controller 201 is lifted to increase the proportion of braking energy recovery of the main drive motor 206 in the front axle braking and rear axle braking of the vehicle.

[0083] Understandably, the preset vehicle speed threshold can be 6 km / h. During normal vehicle operation, when the vehicle speed exceeds 6 km / h, the HCU releases the energy recovery restriction, significantly increasing the proportion of braking energy recovery from the main drive motor 206 in the front and rear axle braking processes while ensuring safe driving.

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

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

[0086] Understandably, during normal vehicle operation, when the vehicle speed exceeds 6 km / h, the HCU releases the energy recovery restriction. Under the premise of ensuring safe driving, the main drive motor 206 is also allowed 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, addressing the aforementioned electrical energy consumption vulnerabilities, this invention optimizes the control strategies for pure electric vehicle startup, driving process, and energy recovery by employing scenario big data analysis, driver habit fitting, energy flow simulation combined with drum tests and vehicle calibration and debugging, as follows:

[0088] 1. When the vehicle is started (i.e., when the vehicle is powered on), the HCU controls the motors in the cooling fan, electric water pump 214, electric steering pump 210, electric steering gear 209, and brake air compressor to idle for 5 seconds and then stop, in order to minimize the wear and tear during the start-up self-test.

[0089] 2. Optimize the motor output control strategy when the vehicle is in motion. When the vehicle 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 operates in the high-efficiency and economical range.

[0090] 3. Optimize the steering control strategy in the HCU. When the vehicle is driving straight without steering, reduce the operating speed of the electric steering pump 210 from 1500 rpm to 1200 rpm. When the gear is in neutral and the handbrake is engaged, the steering pump speed is reduced to idle speed. While ensuring the normal steering function of the vehicle, minimize the energy consumption of the steering motor.

[0091] 4. Optimize braking control strategy: Adjust the braking air pressure operating range from [8 bar, 9 bar] to [8 bar, 10 bar] to increase the redundancy of air pressure changes. This eliminates the need for frequent air compressor inflation and deflation when the air pressure fluctuates drastically during vehicle operation—the air compressor works to inflate when the pressure is below 8 bar, and the valve body deflates when the pressure is above 9 bar—saving energy and reducing noise.

[0092] 5. While ensuring the normal and safe operation of the vehicle, increase the probability and proportion of brake energy recovery during vehicle operation: reduce the minimum speed range for brake energy recovery from [10km / h, 15km / h] to [6km / h, 10km / h], and allow both the front and rear axles to participate in brake energy recovery to maximize the recovery and utilization of mechanical energy and reduce the power consumption of energy storage components.

[0093] 6. When using pure electric vehicles in plains or cities, according to big data statistics, there are basically no conditions that require continuous braking, such as heavy loads and long downhill slopes. The original clause that the motor was not allowed to replace mechanical braking when the power battery SOC was ≥80% has been removed from the vehicle control strategy, further improving the probability of energy recovery.

[0094] In some embodiments, the main drive temperature control strategy is implemented as follows: When the vehicle is powered on, the electric fan and electric water pump 214 in the motor cooling pipe 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 in motion, the main drive motor 206 operates normally, and the electric water pump 214 idles under the control of the HCU, driving the motor cooling water circuit to circulate and remove excess heat from 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 entering and leaving the motor to the HCU via 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 electric water pump 214 accordingly with the change of motor water temperature, so that the main drive motor 206 and the all-in-one controller 205 operate within the normal temperature range, ensuring 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 start and speed signals to the all-in-one controller 205 for the electric power steering pump 210 and the electric air compressor 211. The all-in-one controller 205 then enables the motors inside the power steering pump and air compressor to idle. After 5 seconds of operation, the HCU stops sending start signals, and the all-in-one controller 205 correspondingly disconnects the input current to the power steering pump and air compressor, causing both to 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 power the power steering pump, driving it to rotate at its rated speed (1500 rpm). When the HCU's built-in driving behavior analysis program detects that the vehicle is traveling in a near-straight line and does not require steering, based on the angle information fed back by the electric steering gear 209, it reduces the operating speed of the electric steering pump 210 from 1500 rpm to 1200 rpm. When the driver shifts to neutral and engages the handbrake, the HCU controls the steering pump speed to idle (e.g., 500 rpm), minimizing energy consumption of the steering pump and electric steering gear 209 while ensuring normal vehicle steering function. The air compressor's operation is controlled by both the hard wire of the air pressure switch 215 and the air pressure signal in the CAN bus (Controller Area Network bus). When the low level in the hard wire lasts for 1 minute or the air pressure in the air circuit is less than 8 bar, the HCU activates the air compressor control module in the multi-function controller 205, driving the air compressor to start operating until the hard wire outputs a high level or the air pressure exceeds 10 bar.

[0096] In some embodiments, the energy recovery control strategy is implemented as follows: During normal vehicle operation, when the vehicle speed is greater than 6 km / h, the HCU releases the energy recovery restriction. Under the premise of ensuring safe driving, the proportion of braking energy recovery by the main drive motor 206 in the braking of the front and rear axles is greatly increased. 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 perform energy recovery, thereby maximizing the recovery and utilization of mechanical energy.

[0097] In summary, the energy-saving control method for pure electric vehicles provided by the present invention includes: when the vehicle is powered on, controlling the cooling fan and pump to idle at a target time and then stopping and performing a safety self-check; during vehicle operation, receiving the water temperature signal fed back by the main drive motor 206; when it is determined based on the water temperature signal that the water temperature of the main drive motor 206 has reached 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 water temperature of the motor, so that the main drive motor 206 and the multi-function controller 205 operate within the normal temperature range.

[0098] The energy-saving control method for pure electric vehicles provided by this invention controls the cooling fan and pump to idle at a target speed for a target time and then stop and perform a safety self-check when the vehicle is powered on, which can reduce the consumption during the start-up self-check. Furthermore, during vehicle operation, the method receives the water temperature signal from the main drive motor 206. If the water temperature of the main drive motor 206 reaches the minimum starting limit of the motor cooling water circuit based on the water temperature signal, the method controls the cooling fan to start and adjusts the operating speed of the cooling fan and electronic water pump 214 based on the water temperature, so that the main drive motor 206 and the multi-stage cooling system can operate at a higher speed. The integrated controller 205 operates within a normal temperature range, ensuring low energy consumption for both the main drive motor 206 and the integrated controller 205. The energy-saving control method for pure electric vehicles provided by this invention can be executed by the vehicle controller 201. That is, only a program needs to be set on the vehicle controller 201 to execute the method to reduce the vehicle's energy consumption. This does not require changing the vehicle's hardware structure to reduce mechanical resistance, nor does it increase the vehicle's hardware cost. This solves the technical problem of complex operation and high cost in existing energy-saving measures for pure electric vehicles, thereby improving the vehicle's market competitiveness.

[0099] By adopting the above methods, the energy consumption of high and low voltage electrical components in pure electric vehicles is reduced by 7%-8%, which makes a significant contribution to improving vehicle range and alleviating users' range anxiety.

[0100] As shown in Figure 3, 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 pump 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 fed back by the main drive motor 206 during vehicle operation.

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

[0104] The energy-saving control device for pure electric vehicles provided by this invention controls the cooling fan and pump to idle at a target speed for a target time and then stop and perform a safety self-check when the vehicle is powered on, which can reduce the consumption during the start-up self-check. In addition, during vehicle operation, it receives the water temperature signal of the motor inlet and outlet from the main drive motor. When it is determined based on the water temperature signal that the motor water temperature of the main drive motor has reached the minimum start-up limit of the motor cooling water circuit, it controls the cooling fan to start and adjusts the operating speed of the cooling fan and the electric water pump based on the motor water temperature, so that the main drive motor and the multi-in-one controller operate within the normal temperature range, which can ensure that the operating energy consumption of the main drive motor and the multi-in-one controller is low. The energy-saving control method for pure electric vehicles provided by this invention can be executed by the vehicle controller. That is, only the program for executing the method needs to be set on the vehicle controller to reduce the energy consumption of the vehicle. It does not require changing the vehicle hardware structure to reduce mechanical resistance and does not increase the hardware cost of the vehicle. Thus, it solves the technical problems of complex operation and high cost of existing energy-saving measures for pure electric vehicles, and improves the market competitiveness of the vehicle.

[0105] The energy-saving control device for pure electric vehicles provided in the above embodiments can realize the technical solutions described in the above embodiments of the energy-saving control method for pure electric vehicles. The specific implementation principles of each module or unit can be found in the corresponding content in the above embodiments of the energy-saving control method for pure electric vehicles, and will not be repeated here.

[0106] As shown in Figure 4, the present invention also provides an electronic device 400, which in this embodiment may be a vehicle controller. The electronic device 400 includes a processor 401, a memory 402, and a display 403. Figure 4 only shows some components of the electronic device 400; however, it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented alternatively.

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

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

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

[0110] In some embodiments, display 403 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 403 is used to display information from electronic device 400 and to display a visual user interface. Components 401-403 of 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 for a pure electric vehicle stored in the memory 402, the following steps can be implemented:

[0112] When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target duration before stopping and performing a safety self-check.

[0113] During vehicle operation, the system receives water temperature signals from the main drive motor 206, which are fed back from the motor.

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

[0115] It should be understood that when the processor 401 executes the energy-saving control program for the pure electric vehicle in the memory 402, in addition to the functions mentioned above, it can also perform other functions, as can be found in the description of the corresponding method embodiments above.

[0116] Furthermore, the embodiments of the present invention do not specifically limit the type of electronic device 400 mentioned. Electronic device 400 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can 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, electronic device 400 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

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

[0118] When the vehicle is powered on, the cooling fan and pump are controlled to run at idle speed for a target duration before stopping and performing a safety self-check.

[0119] During vehicle operation, the system receives water temperature signals from the main drive motor 206, which are fed back from the motor.

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

[0121] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0122] The energy-saving control method, device, and vehicle controller 201 for pure electric vehicles provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An energy-saving control method for 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 duration before stopping and performing a safety self-check. During vehicle operation, it receives water temperature signals from the main drive motor, which are fed back from the motor's inlet and outlet. When the water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit based on the water temperature signal, 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 can operate within the normal temperature range.

2. The energy-saving control method for a pure electric vehicle according to claim 1, characterized in that, Also includes: During vehicle operation, the control pump runs at idle speed and drives the motor cooling water circuit to circulate, thereby removing heat from the main drive motor and the all-in-one controller.

3. The energy-saving control method for a pure electric vehicle according to claim 1, characterized in that, When the vehicle is powered on, the cooling fan and pump are controlled to idle at a target speed for a target time before stopping and performing a safety self-check, including: When the vehicle is powered on, the cooling fan and electric water pump are controlled to run at idle speed for the first target duration before stopping and performing 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 multi-in-one controller to control the multi-in-one controller to drive the electric power steering pump to idle speed based on the first start signal and the first speed signal, and to control the multi-in-one controller to drive the electric air compressor to idle speed based on the second start signal and the second speed signal. After the electric power steering pump and electric air compressor have been idling for a second target duration, a first stop signal and a second stop signal are sent to the multi-function controller. The multi-function controller is then controlled to stop the electric power steering pump based on the first stop signal and to stop the electric air compressor based on the second stop signal.

4. The energy-saving control method for pure electric vehicles according to claim 3, characterized in that, Also includes: When the vehicle is driving normally and the main drive motor is working, a third start signal is sent to the multi-function controller to control the multi-function controller to drive the electric power steering pump to rotate at the first rated speed. When it is determined that the vehicle is traveling in a straight line and no steering is required, a first speed adjustment signal is sent to the multi-function controller to control the multi-function controller to reduce the speed of the electric power steering pump from the first rated speed to the second rated speed.

5. The energy-saving control method for a pure electric vehicle according to claim 4, characterized in that, Also includes: Once it is confirmed that the vehicle is shifted to neutral and the handbrake is engaged, a second speed adjustment signal is sent to the multi-function controller to control the multi-function controller to reduce the speed of the electric power steering pump from the second rated speed to idle speed.

6. The energy-saving control method for a pure electric vehicle according to claim 5, characterized in that, Also includes: If the low-level signal in the hard wire of the vehicle continues to reach the third target duration or the air pressure in the air circuit is less than the first air pressure threshold, the multi-in-one controller is controlled to drive the air compressor to start running until the hard wire 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.

7. The energy-saving control method for a pure electric vehicle according to any one of claims 1-6, characterized in that, Also includes: When the vehicle is driving normally and the speed is greater than the preset speed threshold, the energy recovery restriction of the vehicle controller is lifted to increase the proportion of braking energy recovered by the main drive motor in the front and rear axle braking of the vehicle.

8. The energy-saving control method for a pure electric vehicle according to claim 7, characterized in that, Also includes: After the energy recovery restriction of the vehicle controller is lifted and the SOC value of the power battery is greater than the preset SOC threshold, the energy recovery restriction of the main drive motor is lifted.

9. 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 pump to run at idle speed for a target time and then stop and perform a safety self-check when the vehicle is powered on. The signal receiving module is used to receive the water temperature signal fed back by the main drive motor from the motor during vehicle operation. The second operation control module is used to control the cooling fan to start when the motor water temperature of the main drive motor reaches the minimum starting limit of the motor cooling water circuit based on the water temperature signal, and to adjust 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 multi-in-one controller can operate within the normal temperature range.

10. A vehicle controller, characterized in that, Including memory and processor, among which, The memory is used to store programs; The processor, coupled to the memory, 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 8.

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