Vehicle kinetic energy recovery braking method and system

Abstract

This application relates to a vehicle kinetic energy recovery braking method and system, which includes: when the vehicle decelerates and brakes, collecting the state of charge (SOC) value of the power battery and comparing it with the SOC protection limit; if the SOC value is greater than or equal to the SOC protection limit, controlling the kinetic energy recovery generator to connect to an electric energy processing device; otherwise, controlling the kinetic energy recovery generator to connect to the power battery. In the present invention, the battery SOC is compared with the battery SOC protection limit to ensure that when the battery SOC is greater than or equal to the battery SOC protection limit, the electric energy processing device operates to recover the electric energy generated by the kinetic energy recovery generator, so that the kinetic energy recovery function can still be realized when the battery reaches the SOC protection limit.

Description

Technical Field

[0001] The present application relates to the automotive field, and in particular to a vehicle kinetic energy recovery braking method and system thereof. Background Art

[0002] When an electric or hybrid vehicle brakes, the kinetic energy that would otherwise be converted into heat by the braking system is converted into electrical energy through the regenerative braking system. During this process, the electric motor switches to generator mode, converting mechanical energy into electrical energy; the inverter then converts direct current into alternating current, allowing the generated electricity to be stored in the battery. This effectively utilizes energy that would otherwise be wasted.

[0003] During actual driving, to protect the battery, the battery management system first checks the power battery's SOC (State of Charge) when regenerative braking begins. If the SOC is greater than 0.8, indicating sufficient battery charge, regenerative braking will not occur to avoid overcharging the battery, resulting in no braking energy. When the SOC is between 0.7 and 0.8, regenerative braking will be limited by the power battery's maximum allowable charging current. However, when the SOC is below 0.7, regenerative braking is not subject to this restriction, allowing for maximum recovery of braking energy.

[0004] In the traditional solution, the driver can slow down by controlling the depth of the brake pedal and the strength of the kinetic energy recovery by controlling the accelerator pedal. However, in some working conditions, such as long downhill slopes and high speeds, the electric motor is involved for a long time and has excess energy. At this time, the battery SOC will be around 0.8. When driving a vehicle with kinetic energy recovery, many people are accustomed to using the torque generated by kinetic energy recovery to achieve the effect of deceleration and braking. If the battery SOC is greater than 0.8, the battery cannot absorb the electrical energy generated by the motor, which will prevent the motor from generating drag torque and braking effect. If braking is required in an emergency at this time, the driver is accustomed to slowing down through kinetic energy recovery, and the kinetic energy recovery fails at this time, which can easily cause a safety accident. Summary of the Invention

[0005] The present application provides a vehicle kinetic energy recovery braking method and system thereof, which can solve the safety problem existing in the prior art caused by the vehicle not performing braking energy recovery when the battery SOC is greater than the battery SOC protection limit.

[0006] In a first aspect, an embodiment of the present application provides a vehicle kinetic energy recovery braking method, comprising:

[0007] When the vehicle decelerates and brakes, the SOC value of the power battery is collected and compared with the SOC protection limit;

[0008] If the SOC value is greater than or equal to the SOC protection limit, the kinetic energy recovery generator is controlled to connect to the power processing device;

[0009] Otherwise, the kinetic energy recovery generator is controlled to connect to the power battery.

[0010] In combination with the first aspect, in one embodiment, the method further includes:

[0011] Collecting vehicle driving information, wherein the vehicle driving information includes brake pedal position, accelerator pedal position and vehicle speed;

[0012] Based on the vehicle driving information, a type of vehicle deceleration braking is determined, where the type includes coasting braking and pedal braking.

[0013] In conjunction with the first aspect, in one embodiment, determining the type of vehicle deceleration braking based on the vehicle driving information specifically includes:

[0014] When the brake pedal is at the starting position, the accelerator pedal is at the starting position, and the vehicle speed is not zero, the vehicle deceleration braking type is determined to be coasting braking;

[0015] When the brake pedal is in the stepped position, the accelerator pedal is in the starting position, and the vehicle speed is not zero, it is determined that the type of vehicle deceleration braking is pedal braking.

[0016] In conjunction with the first aspect, in one embodiment, when the type of vehicle deceleration braking is coasting braking, controlling the kinetic energy recovery generator to connect to the power processing device specifically includes:

[0017] Collect vehicle speed;

[0018] Based on the vehicle speed and the corresponding relationship between the vehicle speed and the power level of the power processing, obtaining a target power level of the power processing device;

[0019] The kinetic energy recovery generator is connected to the electric energy processing device, and the target electric energy processing power gear is executed.

[0020] In conjunction with the first aspect, in one embodiment, when the type of vehicle deceleration braking is pedal braking, controlling the kinetic energy recovery generator to connect to the power processing device specifically includes:

[0021] Collect vehicle speed and brake pedal position;

[0022] obtaining a target power processing power of the power processing device based on the vehicle speed and the position of the brake pedal;

[0023] The kinetic energy recovery generator is connected to the electric energy processing device, and the target electric energy processing power is executed.

[0024] In combination with the first aspect, in one embodiment, the electric energy processing device includes: an energy consumption unit and a vehicle temperature control unit, the energy consumption unit includes an energy consumption device, and the energy consumption device is used to communicate with the kinetic energy recovery generator; the vehicle temperature control unit is connected to the energy consumption unit for heat exchange.

[0025] In combination with the first aspect, in one embodiment, the energy consumption unit includes: an energy consumption device and a water channel, the energy consumption device is used to communicate with the kinetic energy recovery generator; the water channel is arranged on the outer peripheral surface of the energy consumption device.

[0026] In combination with the first aspect, in one embodiment, the vehicle temperature control unit includes: a main circuit, a first pipeline and a second pipeline, the two ends of the main circuit are connected to the water inlet and the water outlet of the water channel, and the main circuit is connected to a radiator, a first valve body, a water pump and a second valve body in sequence; the first pipeline is connected to the main circuit, and the first pipeline is connected to a heating heat exchanger and a third valve body in sequence, one end of the first pipeline is located between the radiator and the water outlet of the water channel, and the other end is located between the water pump and the water inlet of the water channel; the second pipeline is connected to the main circuit, and the second pipeline is connected to a fourth valve body, one end of the second pipeline is located between the first pipeline and the water outlet of the water channel, and the other end is located between the first pipeline and the water inlet of the water channel.

[0027] In combination with the first aspect, in one embodiment, the electric energy processing device has operating conditions 1, 2, 3, 4, 5 and 6;

[0028] The first working condition includes: when the water temperature of the energy consumption unit and the water temperature of the vehicle temperature control unit are both lower than the first threshold, the fourth valve body is normally open, and the first valve body, the second valve body, and the water pump are closed;

[0029] The second working condition includes: when the water temperature of the energy consumption unit is within the first threshold range, opening the first valve body, the second valve body, the water pump and the radiator, closing the third valve body and the heating heat exchanger, and gradually closing the fourth valve body;

[0030] The third working condition includes: when the water temperature of the energy consumption unit is greater than the second threshold, opening the first valve body, the second valve body, the water pump and the radiator, and closing the third valve body, the fourth valve body and the heating heat exchanger;

[0031] The fourth operating condition includes: when the vehicle is in heating mode and the water temperature of the energy consumption unit and the water temperature of the vehicle temperature control unit are both greater than a second threshold, the first valve body, the second valve body, the water pump and the radiator are opened, and the fourth valve body is closed;

[0032] The fifth operating condition includes: when the vehicle is in heating mode and the water temperature of the energy consumption unit is within the second threshold range, the first valve body, the second valve body, the third valve body, the heating heat exchanger, the water pump and the radiator are opened, and the fourth valve body is closed;

[0033] The working condition six includes: when the vehicle starts the heating mode and the water temperature of the energy consumption unit is less than the third threshold, the first valve body, the third valve body, the heating heat exchanger, the water pump and the radiator are opened, and the second valve body and the fourth valve body are closed.

[0034] In a second aspect, an embodiment of the present application provides a vehicle kinetic energy recovery braking system, wherein the vehicle kinetic energy recovery braking device includes: an electric energy processing device, a collection device and a controller, wherein the electric energy processing device is used to be connected to a kinetic energy recovery generator; the collection device is connected to a power battery for collecting the SOC value of the power battery; the controller is connected to the electric energy processing device, and is used to control the collection device to collect the SOC value of the power battery when the vehicle decelerates and brakes, and compare the SOC value of the power battery with the SOC protection limit value, and is also used to control the kinetic energy recovery generator to be connected to the electric energy processing device when the SOC value is greater than or equal to the SOC protection limit value, and to control the kinetic energy recovery generator to be connected to the power battery when the SOC value is less than the SOC protection limit value.

[0035] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0036] By comparing the battery SOC with the battery SOC protection limit when the vehicle is in deceleration braking, to ensure that when the battery SOC is greater than or equal to the battery SOC protection limit, the power processing device operates to recover the electric energy generated by the kinetic energy recovery generator, so that the kinetic energy recovery function can still be realized when the battery reaches the SOC protection limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic flow chart of a vehicle kinetic energy recovery braking method according to an embodiment of the present application;

[0038] Figure 2 A schematic diagram of a vehicle kinetic energy recovery braking system provided in an embodiment of the present application;

[0039] Figure 3 Schematic diagram of the power processing device provided in an embodiment of the present application.

[0040] In the figure: 1, energy consumption unit; 10, water channel; 11, water outlet; 12, water inlet; 13, energy consumption device; 14, first water temperature sensor;

[0041] 2. Vehicle temperature control unit; 20. Main circuit; 200. Radiator; 201. First valve body; 202. Water pump; 203. Second valve body; 204. Second water temperature sensor; 21. First pipeline; 210. Third valve body; 211. Heating heat exchanger; 22. Second pipeline; 220. Fourth valve body; 23. Water tank;

[0042] 3. Controller; 4. Power battery; 5. Kinetic energy recovery generator; 6. Wheels; 7. Vehicle controller; 8. Vehicle cooling system; 9. Power processing device. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] In a first aspect, an embodiment of the present application provides a vehicle kinetic energy recovery braking method.

[0045] See also Figure 1 , Figure 1 This is a flow chart of the first embodiment of the vehicle kinetic energy recovery braking method of this application. Figure 1 As shown, the vehicle kinetic energy recovery braking method includes:

[0046] When the vehicle decelerates and brakes, the SOC value of the power battery 4 is collected and compared with the SOC protection limit;

[0047] If the SOC value is greater than or equal to the SOC protection limit, the kinetic energy recovery generator 5 is controlled to connect to the power processing device 9;

[0048] Otherwise, the kinetic energy recovery generator 5 is controlled to connect to the power battery 4 .

[0049] In this application, the battery SOC is compared with the SOC protection limit to ensure that when the battery SOC is greater than or equal to the battery SOC protection limit, the power processing device 9 operates to recover the electric energy generated by the kinetic energy recovery generator 5, so that when the battery reaches the SOC protection limit, the kinetic energy recovery function can still be realized.

[0050] In order to facilitate understanding by those skilled in the art, first, some technical terms in this application are explained: the SOC value of the power battery 4 in this application refers to the state of charge, which is used to reflect the remaining capacity of the battery.

[0051] During vehicle kinetic energy recovery braking, the system first performs step 101: during vehicle deceleration, the SOC value of the power battery 4 is collected and compared with the SOC protection limit. Then, the system performs step 102: determining whether the SOC value of the power battery 4 is greater than or equal to the SOC protection limit. Generally, in this embodiment, the SOC protection limit is set to 0.8.

[0052] After the judgment, either step 103 is performed: when the SOC value is greater than or equal to the SOC protection limit, the kinetic energy recovery generator 5 is controlled to connect to the power processing device 9, that is, the power processing device 9 is started to consume the energy of the kinetic energy recovery generator 5; or step 104 is performed: when the SOC value is less than the SOC protection limit, the kinetic energy recovery generator 5 is controlled to connect to the power battery 4, that is, the power battery 4 consumes the energy of the kinetic energy recovery generator 5.

[0053] Through the above two situations, it can be achieved that braking and kinetic energy recovery always meet the driver's preset values, avoiding the situation where the actual vehicle deceleration is inconsistent with the psychological prediction, thereby improving safety.

[0054] There are two braking modes in vehicle deceleration braking: one is coasting braking and the other is pedal braking. Therefore, further, based on the above embodiment, in this embodiment, the method further includes:

[0055] Collecting vehicle driving information, wherein the vehicle driving information includes brake pedal position, accelerator pedal position and vehicle speed;

[0056] Based on the vehicle driving information, a type of vehicle deceleration braking is determined, where the type includes coasting braking and pedal braking.

[0057] Specifically, by collecting the brake pedal position, accelerator pedal position and vehicle speed, it can be determined whether the vehicle's deceleration braking at this time is coasting braking or pedal braking.

[0058] Among them, based on the vehicle driving information, the type of vehicle deceleration braking is determined, specifically including: when the brake pedal position is in the starting position, the accelerator pedal position is in the starting position, and the vehicle speed is not zero, judging that the type of vehicle deceleration braking is coasting braking; when the brake pedal position is in the stepped position, the accelerator pedal position is in the starting position, and the vehicle speed is not zero, judging that the type of vehicle deceleration braking is pedal braking.

[0059] That is to say, when the vehicle is driving, if the driver does not step on the brake pedal and the accelerator pedal, the vehicle deceleration braking is coasting braking at this time, and it is necessary to collect the SOC value of the power battery 4, and compare the SOC value of the power battery 4 with the SOC protection limit value, and then proceed to step 102; when the vehicle is driving, if the driver steps on the brake pedal but does not step on the accelerator pedal, then the vehicle deceleration braking is pedal braking at this time, and it is necessary to collect the SOC value of the power battery 4, and compare the SOC value of the power battery 4 with the SOC protection limit value, and then proceed to step 102.

[0060] Based on the above embodiment, in this embodiment, when the type of vehicle deceleration braking is coasting braking, controlling the kinetic energy recovery generator 5 to connect to the power processing device 9 specifically includes:

[0061] Collect vehicle speed;

[0062] Based on the vehicle speed and the corresponding relationship between the vehicle speed and the power level of the power processing, obtaining the target power level of the power processing device 9;

[0063] The kinetic energy recovery generator 5 is connected to the electric energy processing device 9, and the target electric energy processing power gear is executed.

[0064] Specifically, in this embodiment, the vehicle speed is divided into multiple gears. When the current vehicle speed is between the first speed and the second speed, the corresponding electric energy processing power gear is the first gear; when the current vehicle speed is between the second speed and the third speed, the corresponding electric energy processing power gear is the second gear; when the current vehicle speed is between the third speed and the fourth speed, the corresponding electric energy processing power gear is the fourth gear... In this embodiment, multiple speed intervals can be set, and corresponding multiple electric energy processing power gears can be set. The minimum speed and maximum speed of each speed interval can be set according to actual conditions.

[0065] After the target power level of electric energy processing is determined, the electric energy processing device 9 is operated according to the target power level of electric energy processing to consume the kinetic energy to recover the energy of the generator 5 .

[0066] Based on the above embodiment, in this embodiment, when the type of vehicle deceleration braking is pedal braking, controlling the kinetic energy recovery generator 5 to connect to the power processing device 9 specifically includes:

[0067] Collect vehicle speed and brake pedal position;

[0068] Obtaining a target power processing capacity of the power processing device 9 based on the vehicle speed and the position of the brake pedal;

[0069] The kinetic energy recovery generator 5 is connected to the electric energy processing device 9 and the target electric energy processing power is executed.

[0070] Specifically, in this embodiment, the vehicle speed is divided into multiple gears. When the current vehicle speed is between the first speed and the second speed, the corresponding electric energy processing power gear is the first gear; when the current vehicle speed is between the second speed and the third speed, the corresponding electric energy processing power gear is the second gear; when the current vehicle speed is between the third speed and the fourth speed, the corresponding electric energy processing power gear is the fourth gear... In this embodiment, multiple speed intervals can be set, and corresponding multiple electric energy processing power gears can be set. The minimum speed and maximum speed of each speed interval can be set according to actual conditions.

[0071] When the power processing power level is determined, the target power processing power corresponding to the brake pedal travel is determined in the power processing power level according to the brake pedal position, that is, the brake pedal travel.

[0072] After the target electric energy processing power is determined, the electric energy processing device 9 is operated according to the target electric energy processing power to consume the kinetic energy to recover the energy of the generator 5 .

[0073] Therefore, during the driving process of the vehicle, the brake pedal position signal, accelerator pedal signal, and vehicle speed signal are read to judge and analyze whether the driver has a braking demand. When the controller 3 determines that the vehicle is in coasting braking, if the SOC value of the power battery 4 is less than the SOC protection limit at this time, the vehicle will match the kinetic energy recovery braking force according to the user's preset kinetic energy recovery gear, and at the same time, the power battery 4 performs kinetic energy recovery and deceleration of the kinetic energy recovery generator 5; if the SOC value of the power battery 4 is greater than or equal to the SOC protection limit at this time, the power battery 4 charging circuit is closed, the power processing device 9 is started, and the energy of the kinetic energy recovery generator 5 begins to be consumed; when the controller 3 determines that the vehicle is in coasting braking through the pedal accelerator position signal, the brake pedal position signal, and the vehicle speed signal When the user performs pedal braking, since the brake pedal is directly connected, if the SOC value of the power battery 4 is less than the SOC protection limit at this time, the vehicle will match the kinetic energy recovery braking force according to the user's preset kinetic energy recovery gear, and at the same time, the power battery 4 performs kinetic energy recovery and deceleration of the generator 5, that is, the output braking force is directly controlled by the driver to achieve braking; if the SOC value of the power battery 4 is greater than or equal to the SOC protection limit at this time, the charging circuit of the power battery 4 is closed, the power processing device 9 is started, and the energy of the kinetic energy recovery generator 5 begins to be consumed to cooperate with the driver to output braking force.

[0074] Based on the above embodiments, in this embodiment, the electric energy processing device 9 includes: an energy consumption unit 1 and a vehicle temperature control unit 2, the energy consumption unit 1 includes an energy consumption device 13, and the energy consumption device 13 is used to communicate with the kinetic energy recovery generator 5; the vehicle temperature control unit 2 is connected to the energy consumption unit 1 for heat exchange.

[0075] In this embodiment, the energy consumption unit 1 can be set as a high-power resistor, which can consume the energy of the kinetic energy recovery generator 5. At the same time, the energy consumption unit 1 can generate heat energy during operation. By setting the vehicle temperature control unit 2, the power processing device 9 is connected to the vehicle cooling system 8 to achieve thermal management.

[0076] Based on the above embodiment, in this embodiment, the energy consumption unit 1 includes: an energy consumption device 13 and a water channel 10. The energy consumption device 13 is used to communicate with the kinetic energy recovery generator 5; the water channel 10 is provided on the outer surface of the energy consumption device 13. When the energy consumption device 13 generates heat, it can heat the water in the water channel 10.

[0077] On the basis of the above embodiment, in this embodiment, the vehicle temperature control unit 2 includes: a main circuit 20, a first pipeline 21 and a second pipeline 22. The two ends of the main circuit 20 are connected to the water inlet 12 and the water outlet 11 of the water channel 10. The main circuit 20 is sequentially connected to the radiator 200, the first valve body 201, the water pump 202 and the second valve body 203; the first pipeline 21 is connected to the main circuit 20, and the first pipeline 21 is sequentially connected to the heating heat exchanger 211. and a third valve body 210, one end of the first pipeline 21 is located between the radiator 200 and the water outlet 11 of the water channel 10, and the other end is located between the water pump 202 and the water inlet 12 of the water channel 10; the second pipeline 22 is connected to the main circuit 20, and the fourth valve body 220 is connected to the second pipeline 22, one end of the second pipeline 22 is located between the first pipeline 21 and the water outlet 11 of the water channel 10, and the other end is located between the first pipeline 21 and the water inlet 12 of the water channel 10.

[0078] For details, see Figure 3 As shown, one end of the main circuit 20 is connected to the water inlet 12 of the water channel 10, and the other end is connected to the water outlet 11 of the water channel 10. The first valve body 201 is arranged between the radiator 200 and the water pump 202, and the second valve body 203 is arranged between the water pump 202 and the water inlet 12 of the water channel 10. One end of the radiator 200 is also connected to the water tank 23, and water is supplied to the main circuit 20 through the water tank 23.

[0079] In addition, a first water temperature sensor 14 is provided at the water inlet 12 of the water channel 10 for detecting the water temperature in the water channel 10, and the water temperature is recorded as T1; a second water temperature sensor 204 is provided on the main circuit 20 for detecting the water temperature of the vehicle temperature control unit 2, and the water temperature is recorded as T2.

[0080] Furthermore, the electric energy processing device 9 has working condition one, working condition two, working condition three, working condition four, working condition five and working condition six.

[0081] Operating condition 1 includes the following: when the water temperature of both the energy consumption unit 1 and the vehicle temperature control unit 2 is below a first threshold, the fourth valve body 220 is normally open, and the first valve body 201, the second valve body 203, and the water pump 202 are closed. In this embodiment, the first threshold is set at 80°C, indicating a warm-up state. Water circulates only within the radiator 200, and the temperature of the power processing device 9 is thermally managed by an external air cooling system to ensure rapid warm-up of the vehicle system.

[0082] The second operating condition includes: when the water temperature of the energy consumption unit 1 is within the first threshold range, the first valve body 201, the second valve body 203, the water pump 202, and the radiator 200 are opened, the third valve body 210 and the heating heat exchanger 211 are closed, and the fourth valve body 220 is gradually closed. In this embodiment, the first threshold range is set to 80°C-90°C. When the temperature T1 is between 80°C-90°C, the first valve body 201 is opened, the second valve body 203 is gradually opened, and the fourth valve body 220 is gradually closed, gradually achieving heat exchange between the energy consumption temperature control system and the vehicle temperature control system. At this time, the water pump 202 is operated, causing water to flow through the radiator 200. Then, a portion of the water flows through the second valve body 203 into the water channel 10, and then flows into the main circuit 20 from the water outlet 11 for circulation. The remaining portion of the water flows through the second pipeline 22 and flows into the main circuit 20 for circulation. When the temperature T1 and the temperature T2 tend to be equal, the fourth valve body 220 is closed to prevent the temperature of the vehicle cooling system 8 from being impacted by an excessive temperature difference.

[0083] The third operating condition includes: when the water temperature of the energy consumption unit 1 is greater than the second threshold, the first valve body 201, the second valve body 203, the water pump 202 and the radiator 200 are opened, and the third valve body 210, the fourth valve body 220 and the heating heat exchanger 211 are closed. In this embodiment, the second threshold is set to 90°C. When the temperature T1 is greater than 90°C, the first valve body 201 and the second valve body 203 are both opened, and the third valve body 210 and the fourth valve body 220 are closed. At this time, the energy consumption unit 1 and the vehicle temperature control unit 2 become one, and are thermally managed by the vehicle cooling system 8.

[0084] Operating condition four includes: when the vehicle is in heating mode and the water temperature of energy consumption unit 1 and vehicle temperature control unit 2 are both greater than a second threshold, first valve 201, second valve 203, water pump 202, and radiator 200 are opened, and fourth valve 220 is closed. In winter, when the driver requests heating, when temperatures T1 and T2 are both greater than 90°C, first valve 201, second valve 203, and water pump 202 are opened. Whether third valve 210 and heating heat exchanger 211 are opened depends on whether heating is requested.

[0085] Operating condition five includes: when the vehicle is in heating mode and the water temperature in energy consumption unit 1 is within the second threshold range, first valve body 201, second valve body 203, third valve body 210, heating heat exchanger 211, water pump 202, and radiator 200 are opened, and fourth valve body 220 is closed. In winter, when the driver activates heating, when temperature T1 is between 70°C and 90°C, fourth valve body 220 is closed, first valve body 201, second valve body 203, and third valve body 210 are opened, and heating heat exchanger 211 is connected to vehicle temperature control unit 2, which is then connected to vehicle cooling system 8 to assist in providing heating energy.

[0086] Operating condition six includes: when the vehicle is in heating mode and the water temperature of energy consumption unit 1 is less than a third threshold, the first valve body 201, the third valve body 210, the heating heat exchanger 211, the water pump 202, and the radiator 200 are opened, and the second valve body 203 and the fourth valve body 220 are closed. In this embodiment, in winter, when the driver activates heating, when the water temperature T1 is less than 70°C, the second valve body 203 and the fourth valve body 220 are closed, and the first valve body 201 and the third valve body 210 are opened. At this time, the vehicle temperature control unit 2 provides heat for the warm air.

[0087] Therefore, the present application adds an electric energy processing device 9 at the end of the controller 3. When the SOC value of the power battery 4 is greater than or equal to the SOC protection limit, the electric energy of the kinetic energy recovery generator 5 is processed through the device, thereby solving the problem of failure of the kinetic energy recovery braking function when the power battery 4 is in a high SOC, and a vehicle temperature control unit 2 is set in the electric energy processing device 9, and the vehicle temperature control unit 2 is connected to the vehicle cooling system 8. Through the electric energy processing device 9, the kinetic energy recovery generator 5 can still realize the kinetic energy recovery function when the charging protection limit is reached under high SOC conditions (generally refers to the battery SOC between 0.8-1, specific analysis depends on the design and usage environment).

[0088] In the second aspect, an embodiment of the present application also provides a vehicle kinetic energy recovery braking system, wherein the vehicle kinetic energy recovery braking device includes: an electric energy processing device 9, a collection device and a controller 3, wherein the electric energy processing device 9 is used to be connected to the kinetic energy recovery generator 5; the collection device is connected to the power battery 4 and is used to collect the SOC value of the power battery 4; the controller 3 is connected to the electric energy processing device 9, and is used to control the collection device to collect the SOC value of the power battery 4 when the vehicle decelerates and brakes, and compare the SOC value of the power battery 4 with the SOC protection limit value, and is also used to control the kinetic energy recovery generator 5 to be connected to the electric energy processing device 9 when the SOC value is greater than or equal to the SOC protection limit value, and to control the kinetic energy recovery generator 5 to be connected to the power battery 4 when the SOC value is less than the SOC protection limit value.

[0089] See also Figure 2As shown, Figure 2 A, B, and C in the figure represent the brake pedal position, accelerator pedal position, and vehicle speed, respectively, as part of the vehicle's driving information. Controller 3 is connected to vehicle controller 7, which collects and transmits this information to controller 3. Controller 3 is connected to power battery 4, kinetic energy recovery generator 5, and power processing device 9. The vehicle temperature control unit 2 in power processing device 9 is also connected to the vehicle's cooling system 8, and the kinetic energy recovery generator 5 is connected to wheels 6.

[0090] In this application, the battery SOC is compared with the battery SOC protection limit to ensure that when the battery SOC is greater than or equal to the battery SOC protection limit, the power processing device 9 operates to recover the electric energy generated by the kinetic energy recovery generator 5, so that when the battery reaches the SOC protection limit, the kinetic energy recovery function can still be realized.

[0091] The energy consumption unit 1 includes an energy consumption device 13 and a water channel 10. The energy consumption device 13 is used to communicate with the kinetic energy recovery generator 5. The water channel 10 is provided on the outer surface of the energy consumption device 13. When the energy consumption device 13 generates heat, it can heat the water in the water channel 10.

[0092] The vehicle temperature control unit 2 includes: a main circuit 20, a first pipe 21 and a second pipe 22. Both ends of the main circuit 20 are connected to the water inlet 12 and the water outlet 11 of the water channel 10. The main circuit 20 is sequentially connected to a radiator 200, a first valve body 201, a water pump 202 and a second valve body 203; the first pipe 21 is connected to the main circuit 20, and the first pipe 21 is sequentially connected to a heating heat exchanger 211 and a third valve body 210. One end of the first pipe 21 is located between the radiator 200 and the water outlet 11 of the water channel 10, and the other end is located between the water pump 202 and the water inlet 12 of the water channel 10; the second pipe 22 is connected to the main circuit 20, and the second pipe 22 is connected to a fourth valve body 220. One end of the second pipe 22 is located between the first pipe 21 and the water outlet 11 of the water channel 10, and the other end is located between the first pipe 21 and the water inlet 12 of the water channel 10. For details, see Figure 3 As shown, one end of the main circuit 20 is connected to the water inlet 12 of the water channel 10, and the other end is connected to the water outlet 11 of the water channel 10. The first valve body 201 is arranged between the radiator 200 and the water pump 202, and the second valve body 203 is arranged between the water pump 202 and the water inlet 12 of the water channel 10. One end of the radiator 200 is also connected to the water tank 23, and water is supplied to the main circuit 20 through the water tank 23.

[0093] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0094] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0095] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0096] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0097] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0098] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A vehicle kinetic energy recovery braking method, characterized in that: It includes: When the vehicle decelerates and brakes, the SOC value of the power battery (4) is collected and compared with the SOC protection limit; If the SOC value is greater than or equal to the SOC protection limit, controlling the kinetic energy recovery generator (5) to connect to the power processing device (9); Otherwise, controlling the kinetic energy recovery generator (5) to connect to the power battery (4); The electric energy processing device (9) comprises: An energy consumption unit (1), the energy consumption unit (1) comprising an energy consumption device (13), the energy consumption device (13) being configured to communicate with a kinetic energy recovery generator (5); A whole vehicle temperature control unit (2), the whole vehicle temperature control unit (2) being connected to the energy consumption unit (1) for heat exchange; The energy consumption unit (1) comprises: An energy consumption device (13), the energy consumption device (13) being configured to communicate with the kinetic energy recovery generator (5); A water channel (10), wherein the water channel (10) is provided on the outer peripheral surface of the energy consumption device (13); The vehicle temperature control unit (2) comprises: A main circuit (20), wherein both ends of the main circuit (20) are in communication with the water inlet (12) and the water outlet (11) of the water channel (10), and the main circuit (20) is sequentially connected to a radiator (200), a first valve body (201), a water pump (202), and a second valve body (203); a first pipeline (21), the first pipeline (21) being in communication with the main circuit (20), the first pipeline (21) being connected in sequence to a heating heat exchanger (211) and a third valve body (210), one end of the first pipeline (21) being located between the radiator (200) and the water outlet (11) of the water channel (10), and the other end being located between the water pump (202) and the water inlet (12) of the water channel (10); a second pipeline (22), the second pipeline (22) being in communication with the main circuit (20), the second pipeline (22) being connected to a fourth valve body (220), one end of the second pipeline (22) being located between the first pipeline (21) and the water outlet (11) of the water channel (10), and the other end being located between the first pipeline (21) and the water inlet (12) of the water channel (10); The electric energy processing device (9) has working condition one, working condition two, and working condition three; The working condition 1 includes: when the water temperature of the energy consumption unit (1) and the water temperature of the vehicle temperature control unit (2) are both lower than a first threshold, the fourth valve body (220) is normally open, and the first valve body (201), the second valve body (203), and the water pump (202) are closed; The second operating condition includes: when the water temperature of the energy consumption unit (1) is within a first threshold range, opening the first valve body (201), the second valve body (203), the water pump (202), and the radiator (200), closing the third valve body (210) and the heating heat exchanger (211), and gradually closing the fourth valve body (220); The operating condition three includes: when the water temperature of the energy consumption unit (1) is greater than a second threshold value, opening the first valve body (201), the second valve body (203), the water pump (202) and the radiator (200), and closing the third valve body (210), the fourth valve body (220) and the heating heat exchanger (211).

2. The vehicle kinetic energy recovery braking method according to claim 1, characterized in that: The method further comprises: Collecting vehicle driving information, wherein the vehicle driving information includes brake pedal position, accelerator pedal position and vehicle speed; Based on the vehicle driving information, a type of vehicle deceleration braking is determined, where the type includes coasting braking and pedal braking.

3. The vehicle kinetic energy recovery braking method according to claim 2, characterized in that: Determining the type of vehicle deceleration braking based on the vehicle driving information specifically includes: When the brake pedal is at the starting position, the accelerator pedal is at the starting position, and the vehicle speed is not zero, the vehicle deceleration braking type is determined to be coasting braking; When the brake pedal is in the stepped position, the accelerator pedal is in the starting position, and the vehicle speed is not zero, it is determined that the type of vehicle deceleration braking is pedal braking.

4. The vehicle kinetic energy recovery braking method according to claim 3, characterized in that: When the vehicle deceleration braking type is coasting braking, controlling the kinetic energy recovery generator (5) to connect to the electric energy processing device (9) specifically includes: Collect vehicle speed; Based on the vehicle speed and the corresponding relationship between the vehicle speed and the power level of the power processing, obtaining a target power level of the power processing device (9); The kinetic energy recovery generator (5) is connected to the electric energy processing device (9), and the target electric energy processing power gear is executed.

5. The vehicle kinetic energy recovery braking method according to claim 3, characterized in that: When the vehicle deceleration braking type is pedal braking, controlling the kinetic energy recovery generator (5) to be connected to the electric energy processing device (9) specifically includes: Collect vehicle speed and brake pedal position; Obtaining a target electric energy processing power of the electric energy processing device (9) based on the vehicle speed and the position of the brake pedal; The kinetic energy recovery generator (5) is connected to the electric energy processing device (9) and the target electric energy processing power is executed.

6. The vehicle kinetic energy recovery braking method according to claim 1, wherein: The electric energy processing device (9) further has working conditions 4, 5 and 6; The fourth working condition includes: when the vehicle starts the heating mode, and the water temperature of the energy consumption unit (1) and the water temperature of the vehicle temperature control unit (2) are both greater than the second threshold value, the first valve body (201), the second valve body (203), the water pump (202) and the radiator (200) are opened, and the fourth valve body (220) is closed; The working condition five includes: when the vehicle starts the heating mode and the water temperature of the energy consumption unit (1) is within the second threshold range, the first valve body (201), the second valve body (203), the third valve body (210), the heating heat exchanger (211), the water pump (202) and the radiator (200) are opened, and the fourth valve body (220) is closed; The working condition six includes: when the vehicle starts the heating mode and the water temperature of the energy consumption unit (1) is less than a third threshold value, the first valve body (201), the third valve body (210), the heating heat exchanger (211), the water pump (202) and the radiator (200) are opened, and the second valve body (203) and the fourth valve body (220) are closed.

7. A vehicle kinetic energy recovery braking system, used to implement the vehicle kinetic energy recovery braking method according to any one of claims 1 to 6, characterized in that: The vehicle includes a kinetic energy recovery braking device, wherein the kinetic energy recovery braking device includes: An electric energy processing device (9), the electric energy processing device (9) being used to be connected to the kinetic energy recovery generator (5); A collection device, the collection device being connected to the power battery (4) and being used to collect the SOC value of the power battery (4); A controller (3) is connected to the electric energy processing device (9), and is used to control the acquisition device to acquire the SOC value of the power battery (4) when the vehicle is decelerating and braking, and to compare the SOC value of the power battery (4) with the SOC protection limit value. The controller (3) is also used to control the kinetic energy recovery generator (5) to connect to the electric energy processing device (9) when the SOC value is greater than or equal to the SOC protection limit value, and to control the kinetic energy recovery generator (5) to connect to the power battery (4) when the SOC value is less than the SOC protection limit value.

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