Vehicle speed limit control method and device

Abstract

The invention discloses a vehicle speed limit control method and device, and the method comprises the steps: obtaining the first driving state information of a target vehicle in real time in the driving process of the target vehicle; the first driving state information comprises a first driving mode, a first charge state and a first vehicle speed of the target vehicle; determining whether to trigger speed limit control for the target vehicle according to the first driving state information; after speed limit control is triggered for the target vehicle, the vehicle speed of the target vehicle is controlled to be reduced to a first speed limit value from a first vehicle speed, and the running mode of the target vehicle is controlled to be switched to a second running mode from a first running mode; when the vehicle speed of the target vehicle is reduced to the first speed limit value, the gear of the target vehicle is controlled to be switched to the first gear, and second driving state information of the target vehicle is obtained; the second driving state information comprises a second driving mode, a second charge state and a second vehicle speed of the target vehicle; and determining whether to end speed limit control for the target vehicle according to the second driving state information.

Description

Technical Field

[0001] The present application relates to the field of vehicle control, and in particular to a vehicle speed limit control method and device. Background Art

[0002] For cars that can use electricity as a power source (such as electric cars and hybrid cars), the vehicle is directly driven by an electric motor, which has the advantages of fast acceleration and stable starting.

[0003] However, in the actual driving process of electric vehicles and hybrid vehicles, long-term high-speed driving will cause the state of charge (SOC) of the vehicle battery to decrease and motor failure will limit the vehicle's driving ability. At this time, if the vehicle continues to drive under high-speed and low-power driving conditions, it will not only be difficult to meet the vehicle's high-speed driving needs, but will also cause battery over-discharge and reduce battery performance and life. Summary of the invention

[0004] The embodiments of the present application provide a vehicle speed limit control method and device, which can avoid over-discharge of battery capacity and improve the battery performance and driving safety of the target vehicle.

[0005] In view of this, the first aspect of the present application provides a vehicle speed limit control method, the method comprising:

[0006] During the driving process of the target vehicle, first driving state information of the target vehicle is acquired in real time; wherein the first driving state information includes a first driving mode, a first state of charge and a first vehicle speed of the target vehicle;

[0007] determining whether to trigger speed limit control for the target vehicle according to the first driving state information;

[0008] When the speed limit control is triggered for the target vehicle, the speed of the target vehicle is controlled to drop from the first speed to a first speed limit value, and the driving mode of the target vehicle is controlled to switch from the first driving mode to a second driving mode;

[0009] When the speed of the target vehicle drops to the first speed limit value, the gear of the target vehicle is controlled to switch to the first gear position, and second driving state information of the target vehicle is obtained; the second driving state information includes the second driving mode, the second state of charge and the second vehicle speed of the target vehicle, and the value of the second vehicle speed corresponds to the first speed limit value;

[0010] It is determined whether to terminate the speed limit control for the target vehicle according to the second driving state information.

[0011] Optionally, the method further comprises:

[0012] Determine the second state of charge and the second discharge power of the target vehicle according to the second driving state information;

[0013] When the second state of charge is higher than the second threshold value, but the second discharge power is lower than the second power threshold value, control the gear of the target vehicle to switch from the first gear to the second gear.

[0014] Optionally, the determining whether to trigger speed limit control for the target vehicle according to the first driving state information includes:

[0015] Calculate the first driving power of the target vehicle according to the first driving mode in the first driving state information. If the first driving power is less than the first required power corresponding to the first vehicle speed, trigger speed limit control for the target vehicle;

[0016] Or, if the first state of charge is less than the first threshold value, trigger speed limit control for the target vehicle;

[0017] Or, if the first discharge power is less than the first power threshold value, trigger speed limit control for the target vehicle; wherein, the first discharge power is determined according to the first driving state information.

[0018] Optionally, the determining whether to end the speed limit control for the target vehicle according to the second driving state information includes:

[0019] Calculate the second driving power and the second discharge power of the target vehicle according to the second driving mode in the second driving state information.

[0020] If the second driving power is greater than the second required power corresponding to the second vehicle speed, and the second state of charge is greater than the second threshold value, and the second discharge power is greater than the second power threshold value, end the speed limit control for the target vehicle.

[0021] Optionally, after triggering speed limit control for the target vehicle, controlling the vehicle speed of the target vehicle to decrease from the first vehicle speed to the first speed limit value includes:

[0022] Determine the desired acceleration according to the first vehicle speed and the first speed limit value;

[0023] Detect the driving state of the target vehicle to obtain the actual acceleration of the target vehicle;

[0024] Based on the desired acceleration and the actual acceleration, use a closed-loop control algorithm to control the vehicle speed of the target vehicle to decrease from the first vehicle speed to the first speed limit value.

[0025] Optionally, controlling the driving mode of the target vehicle to switch from the first driving mode to the second driving mode includes:

[0026] Detecting the operating status of the engine and the generator of the target vehicle;

[0027] If the engine and the generator of the target vehicle are both in normal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode; in the parallel mode, the target vehicle is driven by the engine and the battery of the target vehicle, and the battery of the target vehicle is charged by the engine of the target vehicle;

[0028] If the engine of the target vehicle is in an abnormal working state, switching the driving mode of the target vehicle from the first driving mode to a pure electric mode; in the pure electric mode, the target vehicle is driven by a battery of the target vehicle;

[0029] If the generator of the target vehicle is in an abnormal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode, but the battery of the target vehicle is not charged by the engine.

[0030] A second aspect of the present application provides a vehicle speed limit control device, the device comprising:

[0031] An acquisition unit is used to: acquire first driving state information of the target vehicle in real time during the driving process of the target vehicle; wherein the first driving state information includes a first driving mode, a first state of charge and a first vehicle speed of the target vehicle;

[0032] A first determining unit, configured to determine whether to trigger a speed limit control for the target vehicle according to the first driving state information;

[0033] a first control unit, configured to: when the speed limit control is triggered for the target vehicle, control the speed of the target vehicle to drop from the first speed to a first speed limit value, and control the driving mode of the target vehicle to switch from the first driving mode to a second driving mode;

[0034] a second control unit, configured to: when the speed of the target vehicle drops to the first speed limit value, control the gear position of the target vehicle to switch to the first gear position, and obtain second driving state information of the target vehicle; the second driving state information includes the second driving mode, the second state of charge, and the second vehicle speed of the target vehicle, and the value of the second vehicle speed corresponds to the first speed limit value;

[0035] The second determining unit is used to determine whether to end the speed limit control for the target vehicle according to the second driving state information.

[0036] Optionally, the device further includes: a third control unit, configured to:

[0037] Determining a second state of charge and a second discharge power of the target vehicle according to the second driving state information;

[0038] When the second state of charge is higher than a second threshold value but the second discharge power is lower than a second power threshold value, the gear of the target vehicle is controlled to switch from the first gear to the second gear.

[0039] Optionally, the first determining unit is specifically configured to:

[0040] calculating a first driving power of the target vehicle according to the first driving mode in the first driving state information, and triggering a speed limit control for the target vehicle if the first driving power is less than a first required power corresponding to the first vehicle speed;

[0041] or, if the first state of charge is less than a first threshold value, triggering a speed limit control for the target vehicle;

[0042] Or, if the first discharge power is less than a first power threshold, a speed limit control is triggered for the target vehicle; wherein the first discharge power is determined according to first driving state information.

[0043] Optionally, the second determining unit is specifically configured to:

[0044] calculating a second driving power and a second discharging power of the target vehicle according to a second driving mode in the second driving state information;

[0045] If the second driving power is greater than the second required power corresponding to the second vehicle speed, the second state of charge is greater than a second threshold value, and the second discharge power is greater than a second power threshold, the speed limit control for the target vehicle is terminated.

[0046] It can be seen from the above technical solutions that this application has the following advantages:

[0047] The method comprises the following steps: obtaining first driving state information of the target vehicle in real time during the driving process of the target vehicle; wherein the first driving state information includes a first driving mode, a first state of charge and a first vehicle speed of the target vehicle; determining whether to trigger speed limit control for the target vehicle according to the first driving state information; when the speed limit control is triggered for the target vehicle, controlling the vehicle speed of the target vehicle to drop from the first vehicle speed to the first speed limit value, reducing energy consumption during the driving process of the target vehicle by reducing the vehicle speed, and controlling the driving mode of the target vehicle to switch from the first driving mode to the second driving mode, so that the target vehicle can continue to maintain a certain speed and drive normally in the second driving mode; when the vehicle speed of the target vehicle drops to the first speed limit value, controlling the gear position of the target vehicle to switch to the first gear position, which is the lowest gear position that can be used during the driving process of the target vehicle, and obtaining second driving state information including a second driving mode, a second state of charge and a second vehicle speed of the target vehicle, wherein the value of the second vehicle speed corresponds to the first speed limit value; and determining whether to end speed limit control for the target vehicle according to the second driving state information. It can be seen that the present application performs speed limit control on the target vehicle according to the first driving state information of the target vehicle, adjusts the speed, driving mode and gear of the target vehicle, limits the speed and downshifts according to the driving state, and maintains the normal driving of the target vehicle by reducing the energy consumption required during the driving process of the target vehicle, thereby avoiding the target vehicle from driving for a long time under high-speed and low-power driving conditions, and at the same time avoiding over-discharge of the battery capacity, thereby improving the battery performance and driving safety of the target vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A method flow chart of a vehicle speed limit control method provided in an embodiment of the present application;

[0049] Figure 2 A schematic diagram of a driving mode of a target vehicle provided in an embodiment of the present application;

[0050] Figure 3 A schematic diagram of a vehicle speed limit control process provided by an embodiment of the present application scenario embodiment of the present application;

[0051] Figure 4 A schematic diagram of the structure of a vehicle speed limit control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0053] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0054] It should be noted that the concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0055] For cars that can use electricity as a power source (such as electric cars and hybrid cars), the vehicle is directly driven by an electric motor, which has the advantages of fast acceleration and stable starting.

[0056] However, in the actual driving process of electric vehicles, hybrid vehicles, etc., various unexpected environments will cause the driving power of the entire vehicle to decrease. For example, long-term high-speed driving will cause the state of charge (SOC) of the entire vehicle battery to decrease, and motor failure will limit the vehicle's driving ability. At this time, if the vehicle continues to drive under high-speed and low-power driving conditions, it will cause the battery capacity to be over-discharged, and the battery performance and life will be reduced.

[0057] To this end, the present application provides a vehicle speed limit control method and device, which collects the first driving state information of the target vehicle in real time during the driving process of the target vehicle, performs speed limit control on the target vehicle, adjusts the speed, driving mode and gear of the target vehicle, limits the speed and downshifts according to the driving state, and maintains the normal driving of the target vehicle by reducing the energy consumption required during the driving process of the target vehicle, thereby avoiding the target vehicle from driving under high-speed and low-power driving conditions for a long time, and at the same time avoiding over-discharge of the battery capacity, thereby improving the battery performance and driving safety of the target vehicle.

[0058] See also Figure 1 , Figure 1 A method flow chart of a vehicle speed limit control method provided in an embodiment of the present application, the method specifically comprises the following steps:

[0059] Step 101: While a target vehicle is traveling, first driving state information of the target vehicle is obtained in real time.

[0060] During the driving process of the target vehicle, various driving parameters in the target vehicle are detected in real time, so as to obtain the first driving state information of the target vehicle in real time. The first driving state information is a set of driving parameters collected in real time during the driving process of the target vehicle, which may include the first driving mode, the first state of charge and the first vehicle speed of the target vehicle. The state of charge is the ratio of the remaining capacity of the battery after it has been used for a period of time or has been shelved for a long time to its capacity in a fully charged state. It is usually expressed as a percentage, and its value range is 0 to 1. When SOC=0, it means that the battery is fully discharged, and when SOC=1, it means that the battery is fully charged.

[0061] Step 102: Determine whether to trigger speed limit control for the target vehicle according to the first driving state information.

[0062] During the driving process of the target vehicle, the first driving mode, the first charge state and the first vehicle speed corresponding to the target vehicle can be determined according to the first driving status information obtained in real time, and then it can be judged whether the target vehicle is currently in a high-speed and low-battery driving condition. If so, speed limit control is initiated for the target vehicle.

[0063] In a possible implementation, step 102 may be implemented as follows:

[0064] Step 11: calculating a first driving power of the target vehicle according to the first driving mode in the first driving state information, and triggering a speed limit control for the target vehicle if the first driving power is less than a first required power corresponding to the first vehicle speed;

[0065] Step 12: Or, if the first state of charge is less than a first threshold value, triggering a speed limit control for the target vehicle;

[0066] Step 13: Or, if the first discharge power is less than a first power threshold, triggering speed limit control for the target vehicle; wherein the first discharge power is determined according to first driving state information.

[0067] The driving modes of the target vehicle include pure electric mode, series mode and parallel mode, see Figure 2 As shown, Figure 2A schematic diagram of the driving mode of the target vehicle provided in the embodiment of the present application. It can be seen that the maximum torque click is directly connected to the wheel end of the car through the reducer, the generator (Integrated starter generator, ISG) is connected in series with the engine and then connected to the wheel end through the shift mechanism, and the gear of the target vehicle includes neutral, first gear and second gear, wherein the first gear is lower than the second gear and is the lowest gear during the driving process of the target vehicle. In the pure electric mode, the ISG and the engine are not in gear, and the battery provides power to drive the target vehicle to drive through the maximum torque motor; in the series mode, the ISG and the engine are not in gear, and the battery also provides power to drive the target vehicle to drive through the maximum torque motor, but at this time the engine is started, and the target vehicle's battery is charged by driving the ISG to generate electricity; in the parallel mode, the ISG and the engine are in gear, and the engine and the battery provide energy to drive the target vehicle to drive, and the engine can also charge the target vehicle's battery by driving the ISG.

[0068] When acquiring the first driving state information, the vehicle control unit (VCU) can detect the state parameters of the motor, battery and engine of the target vehicle in real time, including battery SOC, charge and discharge capacity, motor speed, motor continuous and peak driving capacity, engine speed, gear ratio and other parameters. Based on these parameters, the available discharge power of the battery, the motor driving power and the driving power corresponding to each gear of the engine can be calculated respectively, and then the first driving power can be calculated according to the first driving mode of the current target vehicle.

[0069] Specifically, in the pure electric mode, only the battery provides electric energy, and the maximum torque motor drives the target vehicle to travel. Therefore, the calculation formula of the first driving power corresponding to the target vehicle in the pure electric mode is as follows:

[0070] P1=P TM

[0071] Where P1 is the first driving power of the target vehicle, P TM is the continuously available drive power of the maximum torque motor.

[0072] In the series mode, since the battery provides electric energy to enable the maximum torque motor to drive the target vehicle, and the engine drives the ISG to charge the battery of the target vehicle, the calculation formula of the first driving power corresponding to the target vehicle in the series mode is as follows:

[0073] P1=min[(P TM +P IC ), C]

[0074] Where P1 is the first driving power of the target vehicle, P TMP is the continuous available driving power of the maximum torque motor. IC is the continuously available charging power of the ISG, and C is the battery discharge power limit.

[0075] In the parallel mode, since the target vehicle is driven by the engine and the battery at the same time, and the ISG can also be driven by the engine to charge the battery of the target vehicle, the calculation formula of the first driving power corresponding to the target vehicle in the parallel mode is as follows:

[0076] P Q1 =min[(P TM +P IQ ), C]

[0077] P Q2 =P D2

[0078] P1=P Q1 +P Q2

[0079] Where P1 is the first driving power of the target vehicle, P Q1 is the peak driving power, P TM P is the continuous available driving power of the maximum torque motor. IQ is the continuous available driving power of ISG, C is the battery discharge power limit, P Q2 is the peak driving power of the engine, P D2 is the available driving power of the engine in second gear.

[0080] It should be noted that in the embodiment of the present application, parameters such as the continuous available driving power of the maximum torque motor, the available driving power of the ISG, the battery discharge power limit, the available driving power corresponding to the engine in the second gear, and the continuous available charging power of the ISG can all be obtained by querying the test parameter table generated by the target vehicle during the test phase.

[0081] When the target vehicle is in a long-term high-speed driving state, whether to trigger the speed limit control for the target vehicle can be determined according to the first driving power of the current target vehicle. When the first driving power is less than the first required power corresponding to the first vehicle speed, it is considered that the target vehicle cannot maintain the current driving state, and therefore the speed limit control needs to be triggered for the target vehicle.

[0082] Alternatively, whether to trigger speed limit control for the target vehicle is determined according to the first state of charge of the target vehicle. If the first state of charge is less than a first threshold value, speed limit control is triggered for the target vehicle. When the first state of charge reaches the first threshold value, it is considered that the battery power of the current target vehicle is low and it is difficult to continue to maintain high-speed driving, so speed limit control needs to be performed on the target vehicle at this time.

[0083] Alternatively, whether to trigger speed limit control for the target vehicle is determined according to the first discharge power of the target vehicle. After the first discharge power is calculated according to the first driving state information, if the first discharge power is less than the first power threshold, it is considered that the current target vehicle is difficult to maintain high-speed driving, and therefore speed limit control is required for the target vehicle.

[0084] When the first driving power of the target vehicle is less than the first required power, or the first state of charge is less than the first threshold value, or the first discharge power is less than the first power threshold, the speed limit control is triggered for the target vehicle. The speed of the target vehicle can be controlled to be limited according to the driving status to prevent the battery of the target vehicle from being over-discharged, which is beneficial to improving the battery life.

[0085] Step 103: When the speed limit control is triggered for the target vehicle, the speed of the target vehicle is controlled to drop from the first speed to a first speed limit value, and the driving mode of the target vehicle is controlled to switch from the first driving mode to a second driving mode.

[0086] After the speed limit control is triggered for the target vehicle, the speed of the target vehicle is first controlled, and the speed of the target vehicle is reduced from the first speed to the first speed limit value, wherein the first speed limit value is the maximum continuous speed that the target vehicle can maintain in the first gear, and this value can also be obtained by querying the engine external characteristic curve generated during the target vehicle test. The first speed limit value is determined according to the charging and discharging capacity of the target vehicle's engine. Under the first speed limit value, the target vehicle's engine can not only meet the driving needs of the target vehicle, but also meet the normal operation needs of other accessories in the target vehicle (such as air conditioning, water pump, etc.), and has additional capacity to charge the battery of the target vehicle, so that the target vehicle can be driven continuously for a long time to maintain a high speed for driving. For example, according to the engine external characteristic curve corresponding to the target vehicle, it can be obtained that when the SOC of the target vehicle is 10%, the first speed limit value is determined to be 160kph, the driving resistance is 600Nm, and the pure driving capacity of the engine in the first gear is 800Nm. At this time, the driving capacity of the engine in the first gear is significantly higher than the driving resistance, so at the first speed limit value, the engine can not only meet the driving needs of the target vehicle, but also have additional capacity to charge the battery of the target vehicle.

[0087] In a possible implementation, the speed of the target vehicle may be reduced from the first speed to the first speed limit value in the following manner:

[0088] Step 21: Determine an expected acceleration according to the first vehicle speed and the first speed limit value.

[0089] When the speed limit control is triggered for the target vehicle, the speed difference between the first vehicle speed and the first speed limit value of the target vehicle is calculated, and the test parameter table corresponding to the target vehicle is queried based on the speed difference to determine the expected acceleration when the speed limit is applied to the target vehicle.

[0090] Step 22: Detecting the driving state of the target vehicle and obtaining the actual acceleration of the target vehicle;

[0091] Step 23: Based on the expected acceleration and the actual acceleration, a closed-loop control algorithm is used to control the speed of the target vehicle to drop from the first speed to the first speed limit.

[0092] By detecting the driving state of the target vehicle, the actual acceleration corresponding to the current target vehicle is obtained, and then the acceleration difference is calculated according to the expected acceleration and the actual acceleration. Based on the acceleration difference, a closed-loop control algorithm is used to control the deceleration of the target vehicle, from the first vehicle speed to the first speed limit. Among them, closed-loop control is a control method for correction based on the output feedback of the control object, and is a control method for correction according to the quota or standard when the actual value is measured to deviate from the expected value. For example, when controlling the speed of the motor, the speed result measured is fed back to the control circuit by a sensor that measures the speed. The PID closed-loop control algorithm is a closed-loop control algorithm that corrects the deviation of the controlled object through a combination of three control algorithms: proportion, integration, and differential coefficient, so that it reaches a stable state. In an embodiment of the present application, the feedback torque corresponding to the feedback control process of the target vehicle during the speed limit process can be calculated by the PID closed-loop control algorithm.

[0093] It should be noted that the parameters required in the PID closed-loop control algorithm process can be obtained by querying the test parameter table generated during the target vehicle test process.

[0094] The expected traction force corresponding to the target vehicle is calculated by the expected acceleration, and the traction force and the driving resistance of the target vehicle during driving are used to further calculate the feedforward torque corresponding to the speed limit process of the target vehicle, thereby realizing the feedforward control process corresponding to the speed limit control process.

[0095] After obtaining the feedforward torque and the feedback torque, the feedforward torque and the feedback torque are added to obtain the speed limit torque corresponding to the speed limit process of the target vehicle. In order to smoothly control the target vehicle to decelerate, a certain slope control value is set for the speed limit torque. The slope control value is used to control the speed of the target vehicle to smoothly drop from the first speed to the first speed limit value, thereby avoiding a sudden drop in the speed of the target vehicle during the speed limit process and improving the driving experience and driving safety of the target vehicle.

[0096] After limiting the speed of the target vehicle, it is also necessary to adjust the driving mode of the target vehicle in combination with the driving state of the target vehicle, and switch the driving mode of the target vehicle from the first driving mode to the second driving mode.

[0097] In a possible implementation, the driving mode of the target vehicle may be controlled to switch from the first driving mode to the second driving mode through the following steps:

[0098] Step 31: Detect the operating status of the engine and generator of the target vehicle.

[0099] Before switching gears for a target vehicle, it is first necessary to detect the working states of the engine and generator of the current target vehicle to determine whether the engine and generator of the current target vehicle can work normally.

[0100] Step 32: If the engine and the generator of the target vehicle are both in normal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode.

[0101] When the engine and the generator of the target vehicle are both in normal operation, in order to ensure the charging capacity under the speed limit state and charge the battery of the target vehicle, no matter what driving mode the first driving mode is, it is switched to the parallel mode. In the parallel mode, the target vehicle is driven by the engine and the battery of the target vehicle, and the battery of the target vehicle is charged by the engine of the target vehicle.

[0102] Step 33: If the engine of the target vehicle is in an abnormal working state, the driving mode of the target vehicle is switched from the first driving mode to a pure electric mode.

[0103] When the target vehicle's engine is in an abnormal working state, since the engine cannot work normally, the series mode and the parallel mode that require the engine to work normally cannot be used. At this time, it is necessary to set the second driving mode to the pure electric mode, and switch the driving mode of the target vehicle from the first driving mode to the pure electric mode. In the pure electric mode, the target vehicle is driven by the battery of the target vehicle, but the battery of the target vehicle cannot be charged by the engine.

[0104] Step 34: If the generator of the target vehicle is in an abnormal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode, but the battery of the target vehicle is not charged by the engine.

[0105] When the generator of the target vehicle is in an abnormal working state, the engine cannot drive the generator to charge the battery of the target vehicle. If the first driving mode of the target vehicle is the parallel mode at this time, then continue to drive in the parallel mode; if the first driving mode of the target vehicle is the series mode at this time, since the battery of the target vehicle cannot be charged, the engine needs to be used to drive the vehicle. By reducing the vehicle speed threshold for the target vehicle to enter the parallel mode, the current first driving mode is switched to the parallel mode to drive the vehicle with the engine, reduce the energy consumption of the target vehicle battery, relieve the driving pressure of the battery, and thus avoid over-discharge of the battery capacity, which is beneficial to improving the performance and lifespan of the battery.

[0106] Step 104: After the vehicle speed of the target vehicle drops to the first speed limit value, control the gear of the target vehicle to switch to the first gear to obtain the second driving state information of the target vehicle.

[0107] The second driving state information includes the second driving mode, the second state of charge, and the second vehicle speed of the target vehicle, and the value of the second vehicle speed corresponds to the first speed limit value. Since the maximum vehicle speed corresponding to each gear is different, and the first gear is lower than the second gear, the maximum vehicle speed corresponding to the first gear is also lower than the maximum vehicle speed corresponding to the second gear. In the embodiment of the present application, after the speed limit control is triggered for the target vehicle, it is not possible to support the target vehicle to drive at the maximum vehicle speed corresponding to the highest gear. Therefore, in order to maintain the vehicle speed of the target vehicle, it is also necessary to switch the gear of the target vehicle to the first gear. In this way, the target vehicle can continue to drive at the vehicle speed corresponding to the first speed limit value in the first gear.

[0108] Step 105: Determine whether to end the speed limit control for the target vehicle according to the second driving state information.

[0109] Since the speed limit control of the target vehicle is triggered according to the first driving state information, after the driving state corresponding to the first driving state information of the target vehicle is adjusted to the driving state corresponding to the second driving state information through the speed limit control, it is also possible to determine whether the speed limit control for the target vehicle can be exited at this time according to the second driving state information.

[0110] In a possible implementation manner, step 105 can be implemented in the following way:

[0111] Step 41: Calculate the second driving power and the second discharge power of the target vehicle according to the second driving mode in the second driving state information;

[0112] Step 42: If the second driving power is greater than the second required power corresponding to the second vehicle speed, the second state of charge is greater than a second threshold value, and the second discharge power is greater than a second power threshold, then the speed limit control for the target vehicle is terminated.

[0113] The second driving mode corresponding to the target vehicle is obtained through the second driving state information, and the second driving power and the second discharge power of the target vehicle at this time are calculated according to the calculation formula corresponding to the second driving mode. At the same time, the second state of charge corresponding to the target vehicle at this time can also be obtained according to the second driving information. When the second driving power at this time is greater than the second required power corresponding to the second vehicle speed, and the second state of charge at this time is greater than the second threshold value and the second discharge power at this time is greater than the second power threshold, it is considered that the target vehicle can maintain high-speed driving for a long time at this time. Therefore, in order to meet the user's high-speed driving needs and improve the dynamic performance of the target vehicle during driving, the speed limit control for the target vehicle is ended. Among them, the second threshold value is greater than the first threshold value.

[0114] As an embodiment, a vehicle speed limit control method provided in an embodiment of the present application may also include the following steps:

[0115] Step 51: determining a second state of charge and a second discharge power of the target vehicle according to the second driving state information;

[0116] Step 52: When the second state of charge is higher than a second threshold value but the second discharge power is lower than a second power threshold value, control the gear of the target vehicle to switch from the first gear to a second gear.

[0117] During the speed limit control process of the target vehicle, the second state of charge of the target vehicle at this time can be determined according to the adjusted second driving state information, and the test parameter table corresponding to the target vehicle can be queried according to the second driving state information, and the second discharge power corresponding to the target vehicle at this time can also be determined. When the second state of charge at this time is high, but the second discharge power is very low, it can be considered that the engine speed corresponding to the second vehicle speed at this time is not within the optimal speed range corresponding to the first gear. If the vehicle continues to drive in the first gear, the wear of the engine will increase and the driving noise of the target vehicle will increase. Therefore, it is necessary to increase the gear of the target vehicle and switch the target vehicle from the first gear to the higher second gear. Since the reduction ratio of the second gear is lower than that of the first gear, at the same speed, the engine speed will be reduced, and the noise during the driving process of the target vehicle will be reduced, thereby improving the noise, vibration and harshness (NVH) performance of the target vehicle, thereby improving the driving experience and driving safety of the target vehicle.

[0118] See also Figure 3, Figure 3 A schematic diagram of a vehicle speed limit control process provided for an embodiment of the present application scenario.

[0119] When the target vehicle is started, as the pressure of the accelerator pedal gradually increases, the speed of the target vehicle gradually increases. According to the driving needs of the user, during the process of gradually increasing speed, the gear is switched from the first gear to the second gear to maintain the high-speed driving of the target vehicle. Since the driving process of the target vehicle consumes the electric energy stored in the battery, its SOC will decrease. When the SOC of the target vehicle is lower than the first threshold value, the speed limit control is triggered for the target vehicle. First, the speed of the target vehicle is gradually reduced from the first speed to the first speed limit value, and the driving mode of the target vehicle is switched to the second driving mode. In the second driving mode, the target vehicle can The battery of the target vehicle is charged, and the SOC of the target vehicle gradually increases; when the speed of the target vehicle drops to the first speed limit value, the gear corresponding to the target vehicle is lowered from the second gear to the first gear; during the speed limit control process, if the second driving power of the target vehicle is greater than the second required power corresponding to the second speed, and the SOC of the target vehicle is greater than the second threshold value, and the second discharge power at this time is greater than the second power threshold, the speed limit control for the target vehicle is terminated. At this time, the target vehicle can continue to travel at a high speed, so the accelerator pedal can be stepped on again to increase the speed of the target vehicle and increase the gear to the second gear.

[0120] A vehicle speed limit control method provided in an embodiment of the present application is provided, by acquiring first driving state information of a target vehicle in real time during the driving process of the target vehicle; wherein the first driving state information includes a first driving mode, a first state of charge and a first vehicle speed of the target vehicle; determining whether to trigger speed limit control for the target vehicle according to the first driving state information; when the speed limit control is triggered for the target vehicle, controlling the speed of the target vehicle to drop from the first vehicle speed to the first speed limit value, reducing energy consumption during the driving process of the target vehicle by reducing the vehicle speed, and controlling the driving mode of the target vehicle to switch from the first driving mode to the second driving mode, in which the target vehicle can continue to maintain a certain speed and drive normally; when the speed of the target vehicle drops to the first speed limit value, controlling the gear position of the target vehicle to switch to the first gear position, the first gear position being the lowest gear position that can be used during the driving process of the target vehicle, obtaining second driving state information including a second driving mode, a second state of charge and a second vehicle speed of the target vehicle, the value of the second vehicle speed corresponding to the first speed limit value; determining whether to end speed limit control for the target vehicle according to the second driving state information. It can be seen that the present application performs speed limit control on the target vehicle according to the first driving state information of the target vehicle, adjusts the speed, driving mode and gear of the target vehicle, limits the speed and downshifts according to the driving state, and maintains the normal driving of the target vehicle by reducing the energy consumption required during the driving process of the target vehicle, thereby avoiding the target vehicle from driving for a long time under high-speed and low-power driving conditions, and at the same time avoiding over-discharge of the battery capacity, thereby improving the battery performance and driving safety of the target vehicle.

[0121] See also Figure 4 , Figure 4 A schematic diagram of the structure of a vehicle speed limit control device provided in an embodiment of the present application, the device includes: an acquisition unit 401, a first determination unit 402, a first control unit 403, a second control unit 404 and a second determination unit 405.

[0122] The acquisition unit 401 is used to: acquire the first driving state information of the target vehicle in real time during the driving process of the target vehicle; wherein the first driving state information includes the first driving mode, the first state of charge and the first vehicle speed of the target vehicle;

[0123] A first determining unit 402 is used to determine whether to trigger a speed limit control for the target vehicle according to the first driving state information;

[0124] The first control unit 403 is used to: when the speed limit control is triggered for the target vehicle, control the speed of the target vehicle to drop from the first speed to a first speed limit value, and control the driving mode of the target vehicle to switch from the first driving mode to a second driving mode;

[0125] The second control unit 404 is configured to: when the speed of the target vehicle drops to the first speed limit value, control the gear of the target vehicle to switch to the first gear position, and obtain second driving state information of the target vehicle; the second driving state information includes the second driving mode, the second state of charge, and the second speed of the target vehicle, and the value of the second speed corresponds to the first speed limit value;

[0126] The second determining unit 405 is used to determine whether to end the speed limit control for the target vehicle according to the second driving state information.

[0127] Optionally, the device further includes: a third control unit, configured to:

[0128] Determining a second state of charge and a second discharge power of the target vehicle according to the second driving state information;

[0129] When the second state of charge is higher than a second threshold value but the second discharge power is lower than a second power threshold value, the gear of the target vehicle is controlled to switch from the first gear to the second gear.

[0130] Optionally, the first determining unit 402 is specifically configured to:

[0131] calculating a first driving power of the target vehicle according to the first driving mode in the first driving state information, and triggering a speed limit control for the target vehicle if the first driving power is less than a first required power corresponding to the first vehicle speed;

[0132] or, if the first state of charge is less than a first threshold value, triggering a speed limit control for the target vehicle;

[0133] Or, if the first discharge power is less than a first power threshold, a speed limit control is triggered for the target vehicle; wherein the first discharge power is determined according to first driving state information.

[0134] Optionally, the second determining unit 405 is specifically configured to:

[0135] calculating a second driving power and a second discharging power of the target vehicle according to a second driving mode in the second driving state information;

[0136] If the second driving power is greater than the second required power corresponding to the second vehicle speed, the second state of charge is greater than a second threshold value, and the second discharge power is greater than a second power threshold, the speed limit control for the target vehicle is terminated.

[0137] Optionally, the first control unit 403 is specifically configured to:

[0138] determining an expected acceleration according to the first vehicle speed and the first speed limit value;

[0139] Detecting the driving state of the target vehicle to obtain the actual acceleration of the target vehicle;

[0140] Based on the expected acceleration and the actual acceleration, a closed-loop control algorithm is used to control the speed of the target vehicle to drop from the first speed to the first speed limit.

[0141] Optionally, the first control unit 403 is specifically configured to:

[0142] Detecting the operating status of the engine and the generator of the target vehicle;

[0143] If the engine and the generator of the target vehicle are both in normal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode; in the parallel mode, the target vehicle is driven by the engine and the battery of the target vehicle, and the battery of the target vehicle is charged by the engine of the target vehicle;

[0144] If the engine of the target vehicle is in an abnormal working state, switching the driving mode of the target vehicle from the first driving mode to a pure electric mode; in the pure electric mode, the target vehicle is driven by a battery of the target vehicle;

[0145] If the generator of the target vehicle is in an abnormal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode, but the battery of the target vehicle is not charged by the engine.

[0146] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0147] Although operations are depicted in a particular order, this should not be understood as requiring that the operations be performed in the particular order shown or in a sequential order.Multitasking and parallel processing may be advantageous under certain circumstances.

[0148] It should be understood that the various steps described in the method implementation of the present application can be performed in different orders and / or performed in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this respect.

[0149] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0150] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A vehicle speed limit control method, It is characterized in that The method comprises: During the driving process of the target vehicle, first driving state information of the target vehicle is acquired in real time; wherein the first driving state information includes a first driving mode, a first state of charge and a first vehicle speed of the target vehicle; determining whether to trigger speed limit control for the target vehicle according to the first driving state information; When the speed limit control is triggered for the target vehicle, the speed of the target vehicle is controlled to drop from the first speed to a first speed limit value, and the driving mode of the target vehicle is controlled to switch from the first driving mode to a second driving mode; When the speed of the target vehicle drops to the first speed limit value, the gear of the target vehicle is controlled to switch to the first gear position, and second driving state information of the target vehicle is obtained; the second driving state information includes the second driving mode, the second state of charge and the second vehicle speed of the target vehicle, and the value of the second vehicle speed corresponds to the first speed limit value; It is determined whether to terminate the speed limit control for the target vehicle according to the second driving state information.

2. The method according to claim 1, It is characterized in that The method further comprises: Determining a second state of charge and a second discharge power of the target vehicle according to the second driving state information; When the second state of charge is higher than a second threshold value but the second discharge power is lower than a second power threshold value, the gear of the target vehicle is controlled to switch from the first gear to the second gear.

3. The method according to claim 1, It is characterized in that The determining whether to trigger speed limit control for the target vehicle according to the first driving state information includes: calculating a first driving power of the target vehicle according to the first driving mode in the first driving state information, and triggering a speed limit control for the target vehicle if the first driving power is less than a first required power corresponding to the first vehicle speed; or, if the first state of charge is less than a first threshold value, triggering a speed limit control for the target vehicle; Or, if the first discharge power is less than a first power threshold, a speed limit control is triggered for the target vehicle; wherein the first discharge power is determined according to first driving state information.

4. The method according to claim 3, It is characterized in that The determining whether to end the speed limit control for the target vehicle according to the second driving state information includes: calculating a second driving power and a second discharging power of the target vehicle according to a second driving mode in the second driving state information; If the second driving power is greater than the second required power corresponding to the second vehicle speed, the second state of charge is greater than a second threshold value, and the second discharge power is greater than a second power threshold, the speed limit control for the target vehicle is terminated.

5. The method according to any one of claims 1 to 4, It is characterized in that When the speed limit control is triggered for the target vehicle, controlling the speed of the target vehicle to drop from the first speed to a first speed limit value includes: determining an expected acceleration according to the first vehicle speed and the first speed limit value; Detecting the driving state of the target vehicle to obtain the actual acceleration of the target vehicle; Based on the expected acceleration and the actual acceleration, a closed-loop control algorithm is used to control the speed of the target vehicle to drop from the first speed to the first speed limit.

6. The method according to claim 1, It is characterized in that The controlling the driving mode of the target vehicle to switch from the first driving mode to the second driving mode comprises: Detecting the operating status of the engine and the generator of the target vehicle; If the engine and the generator of the target vehicle are both in normal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode; in the parallel mode, the target vehicle is driven by the engine and the battery of the target vehicle, and the battery of the target vehicle is charged by the engine of the target vehicle; If the engine of the target vehicle is in an abnormal working state, switching the driving mode of the target vehicle from the first driving mode to a pure electric mode; in the pure electric mode, the target vehicle is driven by a battery of the target vehicle; If the generator of the target vehicle is in an abnormal working state, the driving mode of the target vehicle is switched from the first driving mode to the parallel mode, but the battery of the target vehicle is not charged by the engine.

7. A vehicle speed limit control device, It is characterized in that The device comprises: An acquisition unit is used to: acquire first driving state information of the target vehicle in real time during the driving process of the target vehicle; wherein the first driving state information includes a first driving mode, a first state of charge and a first vehicle speed of the target vehicle; A first determining unit, configured to determine whether to trigger a speed limit control for the target vehicle according to the first driving state information; a first control unit, configured to: when the speed limit control is triggered for the target vehicle, control the speed of the target vehicle to drop from the first speed to a first speed limit value, and control the driving mode of the target vehicle to switch from the first driving mode to a second driving mode; a second control unit, configured to: when the speed of the target vehicle drops to the first speed limit value, control the gear position of the target vehicle to switch to the first gear position, and obtain second driving state information of the target vehicle; the second driving state information includes the second driving mode, the second state of charge, and the second vehicle speed of the target vehicle, and the value of the second vehicle speed corresponds to the first speed limit value; The second determining unit is used to determine whether to end the speed limit control for the target vehicle according to the second driving state information.

8. The device according to claim 7, It is characterized in that The device further comprises: a third control unit, configured to: Determining a second state of charge and a second discharge power of the target vehicle according to the second driving state information; When the second state of charge is higher than a second threshold value but the second discharge power is lower than a second power threshold value, the gear of the target vehicle is controlled to switch from the first gear to the second gear.

9. The device according to claim 7, It is characterized in that The first determining unit is specifically configured to: calculating a first driving power of the target vehicle according to the first driving mode in the first driving state information, and triggering a speed limit control for the target vehicle if the first driving power is less than a first required power corresponding to the first vehicle speed; or, if the first state of charge is less than a first threshold value, triggering a speed limit control for the target vehicle; Or, if the first discharge power is less than a first power threshold, a speed limit control is triggered for the target vehicle; wherein the first discharge power is determined according to first driving state information.

10. The device according to claim 9, It is characterized in that The second determining unit is specifically configured to: calculating a second driving power and a second discharging power of the target vehicle according to a second driving mode in the second driving state information; If the second driving power is greater than the second required power corresponding to the second vehicle speed, the second state of charge is greater than a second threshold value, and the second discharge power is greater than a second power threshold, the speed limit control for the target vehicle is terminated.

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