Driving protection control method and device for pure electric double-circuit air braking

Abstract

The present invention provides a driving protection control method and device for a pure-electric double-circuit pneumatic braking system, which relates to the technical field of electric vehicles and is applied to electric vehicles. The first air pressure of the front axle air outlet cylinder and the second air pressure of the rear axle air outlet cylinder of the electric vehicle are obtained; based on the first air pressure and the second air pressure, it is determined whether the electric vehicle has an air leak; if the electric vehicle has an air leak, the type of air leak and the air leak rate are determined; based on the type of air leak and the air leak rate, the power of the electric vehicle is limited to provide driving protection for the electric vehicle. In this way, by limiting the power of the electric vehicle according to the type of air leak and the air leak rate, the safety of the vehicle and the personnel in the vehicle is improved, and the safety risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a driving protection control method and device for a pure electric double-loop pneumatic brake. Background Art

[0002] As a new type of transportation vehicle, the safety of the braking system of an electric vehicle is of crucial importance. The braking system of an electric vehicle usually includes a front axle air reservoir and a rear axle air reservoir for storing compressed air. When the driver presses the brake pedal, the compressed air in the air reservoir is delivered to the braking components through pipelines, thereby generating braking force. At the same time, the Vehicle Control Unit (VCU) can monitor the air pressure in the air reservoir in real time through a pressure sensor to promptly detect and handle air leakage problems in the vehicle pipelines or braking components.

[0003] However, although the operating state of the vehicle can be monitored in the related art, when a fault occurs in the braking system, it is often impossible to take protective measures in a timely and effective manner, thus increasing the safety risks of the vehicle and the personnel inside the vehicle. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a driving protection control method and device for a pure electric double-loop pneumatic brake, which limit the power of the electric vehicle based on the air leakage type and air leakage rate to improve the safety of the vehicle and the personnel inside the vehicle and reduce the safety risks.

[0005] In a first aspect, an embodiment of the present invention provides a driving protection control method for a pure electric double-loop pneumatic brake, which is applied to an electric vehicle. The method includes: obtaining a first air pressure of a front axle air outlet cylinder and a second air pressure of a rear axle air outlet cylinder of the electric vehicle; determining whether the electric vehicle leaks air based on the first air pressure and the second air pressure; if the electric vehicle leaks air, determining the air leakage type and air leakage rate; and limiting the power of the electric vehicle based on the air leakage type and air leakage rate to perform driving protection on the electric vehicle.

[0006] In a preferred embodiment of the present invention, the determining whether the electric vehicle leaks air based on the first air pressure and the second air pressure includes: obtaining an initial first air pressure of the front axle air outlet cylinder and an initial second air pressure of the rear axle air outlet cylinder when the electric vehicle starts; determining a first difference between the initial first air pressure and the initial second air pressure; determining a second difference between the first air pressure and the second air pressure; and determining whether the electric vehicle leaks air based on the first difference and the second difference.

[0007] In a preferred embodiment of the present invention, determining whether the electric vehicle has a leak based on the first difference and the second difference includes: if the second difference is greater than a preset first air pressure threshold, determining that the electric vehicle has a leak; if the second difference is less than or equal to the first air pressure threshold, determining whether the difference between the first difference and the second difference is greater than a preset second air pressure threshold; if the difference between the first difference and the second difference is greater than the second air pressure threshold, determining that the electric vehicle has a leak.

[0008] In a preferred embodiment of the present invention, determining the leak type includes: if the leak mode of the electric vehicle is at least one of fuel pipe leak, lubricating oil pipe leak, cooling pipe leak, and power steering oil pipe leak, the leak type is a vehicle-wide pipe leak; if the electric vehicle has at least one leak of brake pump leak, brake pad leak, and brake pipe leak, the leak type is a brake pipe leak.

[0009] In a preferred embodiment of the present invention, determining the leak rate includes: determining the time interval between the start time of the leak and the current time; determining the air pressure drop per unit time based on the difference between the first air pressure and the second air pressure and the time interval; taking the air pressure drop as the leak rate.

[0010] In a preferred embodiment of the present invention, restricting the power of the electric vehicle based on the leak type and the leak rate includes: determining the leak weight of the electric vehicle based on the leak type; determining the leak rate threshold corresponding to the leak weight based on a preset mapping relationship; if the leak rate meets the leak rate threshold, restricting the power of the electric vehicle.

[0011] In a preferred embodiment of the present invention, determining the leak weight of the electric vehicle based on the leak type includes: determining at least one leak mode of the electric vehicle included in the leak type; respectively assigning values to the at least one leak mode to obtain the initial leak weights corresponding to various leak modes; adding up the initial leak weights to obtain the leak weight.

[0012] In a preferred embodiment of the present invention, restricting the power of the electric vehicle includes: determining the torque limit value of the motor of the electric vehicle based on the current vehicle speed of the electric vehicle; restricting the power by the torque limit value of the motor.

[0013] In a preferred embodiment of the present invention, the motor is a permanent magnet synchronous motor, the maximum power of the motor is 420 kW, and the peak torque is 2800 N·m.

[0014] In a preferred embodiment of the present invention, determining the torque limit value of the motor of the electric vehicle based on the current vehicle speed of the electric vehicle includes: if the current vehicle speed is within a preset first interval, no limit is imposed on the torque limit value; if the current vehicle speed is within a preset second interval, the torque limit value is set to one-fourth; if the current vehicle speed is within a preset third interval, the torque limit value is set to one-half.

[0015] In a preferred embodiment of the present invention, the above-mentioned electric vehicle further includes a display instrument. Before limiting the power of the electric vehicle, the above method further includes: activating the air leakage identification of the electric vehicle; while limiting the power of the electric vehicle, the above method further includes: displaying the corresponding fault information in the display instrument.

[0016] In a preferred embodiment of the present invention, the above-mentioned electric vehicle further includes a pressure sensor, and the pressure sensor is used to collect the air pressure of the front axle air outlet cylinder and the air pressure of the rear axle air outlet cylinder, and the model of the pressure sensor is PT100.

[0017] In a second aspect, an embodiment of the present invention further provides a driving protection control device for a pure electric double-circuit air pressure braking, which is applied to an electric vehicle. The device includes: an air pressure acquisition module, configured to acquire a first air pressure of a front axle air outlet cylinder and a second air pressure of a rear axle air outlet cylinder of the electric vehicle; an air leakage determination module, configured to determine whether the electric vehicle leaks air based on the first air pressure and the second air pressure; a type and rate determination module, configured to determine the air leakage type and air leakage rate if the electric vehicle leaks air; a power limit module, configured to limit the power based on the air leakage type and air leakage rate to perform driving protection on the electric vehicle.

[0018] In a third aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory, and the memory stores computer-executable instructions that can be executed by the processor. The processor executes the computer-executable instructions to implement the driving protection control method for the pure electric double-circuit air pressure braking in the first aspect above.

[0019] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, and the computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by the processor, the computer-executable instructions cause the processor to implement the driving protection control method for the pure electric double-circuit air pressure braking in the first aspect above.

[0020] The embodiments of the present invention bring the following beneficial effects:

[0021] An embodiment of the present invention provides a driving protection control method and device for a pure - electric dual - circuit pneumatic brake, which is applied to an electric vehicle. By obtaining the first air pressure of the front - axle air outlet cylinder and the second air pressure of the rear - axle air outlet cylinder of the electric vehicle, it is determined whether the electric vehicle leaks air based on the first air pressure and the second air pressure. If the electric vehicle leaks air, the type of air leakage and the air leakage rate are determined, and the power of the electric vehicle is limited based on the type of air leakage and the air leakage rate to provide driving protection for the electric vehicle. In this way, by limiting the power of the electric vehicle according to the type of air leakage and the air leakage rate, the safety of the vehicle and the personnel in the vehicle is improved, and the safety risk is reduced.

[0022] Other features and advantages of the present disclosure will be described in the following description, or some features and advantages can be inferred from the description without doubt, or can be known by implementing the above - mentioned technologies of the present disclosure.

[0023] To make the above - mentioned objects, features, and advantages of the present disclosure more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following - described drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a flowchart of a driving protection control method for a pure - electric dual - circuit pneumatic brake provided by an embodiment of the present invention;

[0026] Figure 2 It is a flowchart of another driving protection control method for a pure - electric dual - circuit pneumatic brake provided by an embodiment of the present invention;

[0027] Figure 3a It is a flowchart of another driving protection control method for a pure - electric dual - circuit pneumatic brake provided by an embodiment of the present invention;

[0028] Figure 3b It is a driving protection control logic diagram for a pure - electric dual - circuit pneumatic brake provided by an embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a driving protection control device for a pure - electric dual - circuit pneumatic brake provided by an embodiment of the present invention;

[0030] Figure 5 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. Detailed Implementation Modes

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] As a new type of transportation vehicle, the safety of the braking system of an electric vehicle is of crucial importance. The braking system of an electric vehicle generally includes a front axle air storage tank and a rear axle air storage tank for storing compressed air. When the driver steps on the brake pedal, the compressed air in the air storage tank is delivered through pipelines to the braking components, thereby generating braking force. At the same time, the Vehicle Control Unit (VCU) can monitor the air pressure in the air storage tank in real time through a pressure sensor to promptly detect and handle air leakage problems in the vehicle pipelines or braking components.

[0033] However, although the operating state of the vehicle can be monitored in the related art, when a fault occurs in the braking system, protective measures often cannot be taken promptly and effectively, thereby increasing the safety risks of the vehicle and the personnel inside the vehicle.

[0034] Based on this, a drive protection control method and device for a pure electric dual-circuit pneumatic braking provided by the embodiments of the present invention can determine whether an electric vehicle leaks air by obtaining the first air pressure of the front axle air outlet cylinder and the second air pressure of the rear axle air outlet cylinder of the electric vehicle. If the electric vehicle leaks air, determine the leakage type and leakage rate, and limit the power of the electric vehicle based on the leakage type and leakage rate to provide drive protection for the electric vehicle. In this way, by limiting the power of the electric vehicle according to the leakage type and leakage rate, the safety of the vehicle and the personnel inside the vehicle is improved, and the safety risk is reduced.

[0035] To facilitate the understanding of this embodiment, a drive protection control method for a pure electric dual-circuit pneumatic braking disclosed in the embodiments of the present invention will be introduced in detail first.

[0036] Embodiment 1

[0037] The embodiments of the present invention provide a drive protection control method for a pure electric dual-circuit pneumatic braking, which is applied to an electric vehicle. Figure 1 This is a flowchart of a drive protection control method for a pure electric dual-circuit pneumatic braking provided by the embodiments of the present invention. As Figure 1 shown, the drive protection control method for a pure electric dual-circuit pneumatic braking may include the following steps:

[0038] Step S101, obtain the first air pressure of the front axle air outlet cylinder and the second air pressure of the rear axle air outlet cylinder of the electric vehicle.

[0039] Among them, the electric vehicle may include a pressure sensor, which is used to collect the air pressure of the front axle air outlet cylinder and the air pressure of the rear axle air outlet cylinder. The model of the pressure sensor may be PT100.

[0040] Step S102, determine whether the electric vehicle is leaking air based on the first air pressure and the second air pressure.

[0041] Among them, the difference between the first air pressure and the second air pressure can be determined. If the difference exceeds the normal range, it is considered that the electric vehicle is leaking air. If the difference does not exceed the normal range, then determine the difference between the first air pressure before the electric vehicle starts and the second air pressure before the electric vehicle starts. If the difference exceeds the normal range, it is considered that the electric vehicle is leaking air.

[0042] Step S103, if the electric vehicle is leaking air, determine the type of air leakage and the air leakage rate.

[0043] Specifically, if the air leakage mode of the electric vehicle is at least one of fuel pipe air leakage, lubricating oil pipe air leakage, cooling pipeline air leakage and steering assist oil pipe air leakage, the type of air leakage is vehicle pipeline air leakage; if the electric vehicle is at least one of brake pump air leakage, brake pad air leakage and brake pipeline air leakage, the type of air leakage is brake pipeline air leakage.

[0044] Among them, the air leakage mode of the electric vehicle can be determined by a device with an air leakage inspection function or by manual inspection.

[0045] In the case of manual inspection, for vehicle pipeline air leakage, first, the specific location of the air leakage needs to be determined. For example, it can be achieved by observing, listening to sounds, applying soapy water and using professional detection instruments. It can be observed whether there are obvious oil stains, stains or damage marks on the surface of the pipeline; when the electric vehicle is stationary, carefully listen for the sound of gas leakage; apply soapy water to the suspected air leakage part and observe whether there are bubbles; accurately locate the air leakage position through a gas leakage detector, etc. For brake pipeline air leakage, first, it is necessary to check whether the various components of the braking system, such as brake pads, brake pumps, brake pipelines, etc. are intact, and especially pay attention to checking whether the brake pipelines have cracks, wear or poor connections. Similarly, the air leakage position can be determined by observing, listening to sounds, applying soapy water and using professional detection instruments.

[0046] Specifically, determining the air leakage rate may include: determining the time interval between the start time of air leakage and the current time; determining the air pressure drop per unit time based on the difference between the first air pressure and the second air pressure and the time interval; taking the air pressure drop as the air leakage rate.

[0047] Step S104, limit the power of the electric vehicle based on the air leakage type and the air leakage rate to protect the driving of the electric vehicle.

[0048] Among them, when air leakage occurs, if the air leakage rate is too high, it is considered to affect the driving safety of the electric vehicle. When air leakage occurs, it is usually necessary to deal with the air leakage position.

[0049] For example, when the fuel pipe leaks, since fuel is a flammable substance and there are serious safety hazards, the vehicle should be immediately stopped and professional maintenance personnel should be contacted for repair; when the lubricating oil pipe leaks, it will cause the loss of lubricating oil and affect the lubrication effect of mechanical parts. Therefore, it is necessary to check whether the lubricating oil pipe is aged, worn or loose, and replace or fasten it in time; when the cooling pipe leaks, it will affect the cooling effect of the engine and cause the engine to overheat. Therefore, it is necessary to check whether there are cracks, looseness or poor connections in the cooling pipe, and repair it in time; when the brake pump leaks, it is necessary to check whether the sealing performance of the brake pump is good, and replace the brake pump if necessary; when the brake pad leaks, check whether the brake pad is severely worn or improperly installed, and whether there is air leakage in the brake caliper. If necessary, replace the brake pad or repair the brake caliper; when the brake pipe leaks, it is necessary to check the condition of the brake pipe and replace or repair the damaged parts in time, etc.

[0050] However, there may still be a situation where it is impossible to stop for maintenance when air leakage occurs. At this time, it is necessary to limit the power to the most appropriate range according to the degree of influence of different air leakage methods on the electric vehicle, so as to ensure that the electric vehicle can reach a position where it can stop quickly and safely.

[0051] The driving protection control method of pure electric double-circuit air pressure braking provided by the embodiment of the present invention can determine whether the electric vehicle leaks air by obtaining the first air pressure of the front axle air outlet cylinder and the second air pressure of the rear axle air outlet cylinder of the electric vehicle. If the electric vehicle leaks air, determine the air leakage type and the air leakage rate, and limit the power of the electric vehicle based on the air leakage type and the air leakage rate to protect the driving of the electric vehicle. In this way, by limiting the power of the electric vehicle through the air leakage type and the air leakage rate, the safety of the vehicle and the personnel in the vehicle is improved, and the safety risk is reduced.

[0052] Embodiment 2

[0053] The embodiment of the present invention also provides another driving protection control method for pure electric double-circuit air pressure braking; this method is implemented on the basis of the method of the above embodiment; this method focuses on describing the specific implementation manner of determining whether the electric vehicle leaks air based on the first air pressure and the second air pressure.

[0054] Figure 2The flowchart of another driving protection control method for a pure - electric dual - circuit pneumatic brake provided by an embodiment of the present invention is as follows. As Figure 2 shown, determining whether an electric vehicle has an air leak based on the first air pressure and the second air pressure may include the following steps:

[0055] Step S201, obtain the initial first air pressure of the front - axle air outlet cylinder and the initial second air pressure of the rear - axle air outlet cylinder when the electric vehicle starts.

[0056] It should be noted that before the electric vehicle starts, there may be a difference in air pressure between the front - axle air outlet cylinder and the rear - axle air outlet cylinder. Therefore, the presence or absence of a difference in air pressure between the front - and rear - axle air outlet cylinders alone cannot be used as the basis for determining whether there is an air leak.

[0057] Step S202, determine the first difference between the initial first air pressure and the initial second air pressure.

[0058] Among them, subtract the initial second air pressure from the initial first air pressure to obtain the first difference.

[0059] Step S203, determine the second difference between the first air pressure and the second air pressure.

[0060] Among them, subtract the second air pressure from the first air pressure to obtain the second difference.

[0061] Step S204, determine whether the electric vehicle has an air leak based on the first difference and the second difference.

[0062] Specifically, determining whether the electric vehicle has an air leak based on the first difference and the second difference may include: if the second difference is greater than a preset first air - pressure threshold, determine that the electric vehicle has an air leak; if the second difference is less than or equal to the first air - pressure threshold, determine whether the difference between the first difference and the second difference is greater than a preset second air - pressure threshold; if the difference between the first difference and the second difference is greater than the second air - pressure threshold, determine that the electric vehicle has an air leak.

[0063] Among them, when the first difference exceeds the normal range, that is, exceeds the first air - pressure threshold, it can be considered that the electric vehicle has an air leak. Also, when the difference between the first difference and the second difference exceeds the normal range, that is, exceeds the second air - pressure threshold, it can be considered that the electric vehicle has an air leak.

[0064] The driving protection control method for a pure - electric dual - circuit pneumatic brake provided by an embodiment of the present invention can determine whether an electric vehicle has an air leak through the first difference and the second difference, improving the accuracy of air - leak detection. Furthermore, when it is determined that the electric vehicle has an air leak, corresponding power limitation is taken, improving the safety of the vehicle and the personnel in the vehicle and reducing the safety risk.

[0065] Embodiment 3

[0066] The embodiment of the present invention also provides another driving protection control method for a pure - electric dual - circuit pneumatic brake; this method is implemented on the basis of the method in the above - mentioned embodiment; this method focuses on describing the specific implementation manner of limiting the power of an electric vehicle based on the leakage type and leakage rate.

[0067] Figure 3a It is a flowchart of another driving protection control method for a pure - electric dual - circuit pneumatic brake provided by the embodiment of the present invention. As Figure 3a shown, the method of limiting the power of an electric vehicle based on the leakage type and leakage rate may include the following steps:

[0068] Step S301, determine the leakage weight of the electric vehicle based on the leakage type.

[0069] Specifically, determining the leakage weight of the electric vehicle based on the leakage type may include: determining at least one leakage mode of the electric vehicle included in the leakage type; respectively assigning values to the at least one leakage mode to obtain the initial leakage weights corresponding to various leakage modes; adding the initial leakage weights to obtain the leakage weight.

[0070] Among them, since the influence degree of each leakage mode on the electric vehicle is different, different importance coefficients can be set for different leakage modes, that is, assign values, as the initial leakage weights of the leakage modes. When there is one leakage mode of the electric vehicle, this initial leakage weight is used as the leakage weight; when there are multiple leakage modes of the electric vehicle, the initial leakage weights of the multiple leakage modes are added to obtain the leakage weight.

[0071] Step S302, determine the leakage rate threshold corresponding to the leakage weight based on the pre - set mapping relationship.

[0072] Among them, the greater the leakage weight, the greater the impact on the safety of the electric vehicle, so the higher the requirement for the leakage rate, that is, the greater the leakage weight, the smaller the leakage rate threshold. The mapping relationship between the leakage weight and the leakage rate threshold can be pre - set.

[0073] Step S303, if the leakage rate meets the leakage rate threshold, limit the power of the electric vehicle.

[0074] Specifically, limiting the power of the electric vehicle may include: determining the torque limit value of the motor of the electric vehicle based on the current vehicle speed of the electric vehicle; limiting the power through the torque limit value of the motor.

[0075] Among them, determining the torque limit value of the motor of the electric vehicle based on the current vehicle speed of the electric vehicle may include: if the current vehicle speed is within a preset first interval, the torque limit value is not restricted; if the current vehicle speed is within a preset second interval, the torque limit value is set to one-fourth; if the current vehicle speed is within a preset third interval, the torque limit value is set to one-half.

[0076] Among them, the motor is a permanent magnet synchronous motor, the maximum power of the motor is 420 kW, and the peak torque is 2800 N·m.

[0077] Furthermore, the electric vehicle may further include a display instrument. Before restricting the power of the electric vehicle, the air leakage identification of the electric vehicle can be activated. While restricting the power of the electric vehicle, the corresponding fault information can be displayed on the display instrument.

[0078] For the convenience of understanding, Figure 3b This is a drive protection control logic diagram of a pure electric double-circuit air pressure braking provided by an embodiment of the present invention. As Figure 3b shown, during the driving process of the electric vehicle, the VCU monitors the first air pressure of the front axle air outlet cylinder and the second air pressure of the rear axle air outlet cylinder through an air pressure sensor. After determining air leakage, the air leakage type is determined through a device with an air leakage inspection function, and the corresponding air leakage rate threshold is determined through the air leakage type. When the air leakage rate of the electric vehicle is greater than or equal to the corresponding air leakage rate threshold, the air leakage identification of the electric vehicle is activated. When the air leakage rate is less than the corresponding air leakage rate threshold, no processing is performed; after activating the air leakage identification of the electric vehicle, the VCU transmits information to the display instrument through the CAN line, so as to display the fault information on the display instrument; at the same time, the VCU forwards the torque limit value according to the current vehicle speed of the electric vehicle through the CAN line, the shift controller controls the motor controller to perform power restriction, and the motor executes the power restriction, improving the overall safety of the electric vehicle, thereby protecting the safety of the personnel in the vehicle and pedestrians.

[0079] Among them, when the current vehicle speed is within 0 - 30 km / h, the torque limit value is not restricted; when the current vehicle speed is within 31 - 60 km / h, the torque limit value is set to one-fourth; when the current vehicle speed is greater than 600 km / h, the torque limit value is set to one-half.

[0080] The drive protection control method of the pure electric double-circuit air pressure braking provided by the embodiment of the present invention can restrict the power of the electric vehicle through the air leakage type and the air leakage rate, so that different air leakage weights correspond to different air leakage rate thresholds to restrict the power of the electric vehicle, avoiding the acceleration of the air leakage rate and thus improving the overall safety of the electric vehicle and reducing the safety risk.

[0081] Embodiment 4

[0082] Corresponding to the above method embodiments, an embodiment of the present invention provides a driving protection control device for a pure - electric dual - circuit pneumatic brake, which is applied to an electric vehicle. Figure 4 , such as Figure 4 shown, the driving protection control device for the pure - electric dual - circuit pneumatic brake may include:

[0083] A pneumatic pressure acquisition module 401, configured to acquire a first pneumatic pressure of the front - axle air outlet cylinder and a second pneumatic pressure of the rear - axle air outlet cylinder of the electric vehicle.

[0084] A leakage determination module 402, configured to determine whether the electric vehicle leaks air based on the first pneumatic pressure and the second pneumatic pressure.

[0085] A leakage type and rate determination module 403, configured to determine the leakage type and leakage rate if the electric vehicle leaks air.

[0086] A power limitation module 404, configured to limit the power based on the power of the leakage type and leakage rate to perform driving protection on the electric vehicle.

[0087] The driving protection control device for the pure - electric dual - circuit pneumatic brake provided by the embodiment of the present invention can acquire the first pneumatic pressure of the front - axle air outlet cylinder and the second pneumatic pressure of the rear - axle air outlet cylinder of the electric vehicle, determine whether the electric vehicle leaks air based on the first pneumatic pressure and the second pneumatic pressure, if the electric vehicle leaks air, determine the leakage type and leakage rate, and limit the power of the electric vehicle based on the leakage type and leakage rate to perform driving protection on the electric vehicle. In this way, by limiting the power of the electric vehicle according to the leakage type and leakage rate, the safety of the vehicle and the personnel in the vehicle is improved, and the safety risk is reduced.

[0088] In some embodiments, the leakage determination module is further configured to acquire an initial first pneumatic pressure of the front - axle air outlet cylinder and an initial second pneumatic pressure of the rear - axle air outlet cylinder when the electric vehicle starts; determine a first difference between the initial first pneumatic pressure and the initial second pneumatic pressure; determine a second difference between the first pneumatic pressure and the second pneumatic pressure; and determine whether the electric vehicle leaks air based on the first difference and the second difference.

[0089] In some embodiments, the leakage determination module is further configured to determine that the electric vehicle leaks air if the second difference is greater than a preset first pneumatic pressure threshold; determine whether the difference between the first difference and the second difference is greater than a preset second pneumatic pressure threshold if the second difference is less than or equal to the first pneumatic pressure threshold; and determine that the electric vehicle leaks air if the difference between the first difference and the second difference is greater than the second pneumatic pressure threshold.

[0090] In some embodiments, the type and rate determination module is further configured to determine that if the air leakage mode of the electric vehicle is at least one of fuel pipe air leakage, lubricating oil pipe air leakage, cooling pipeline air leakage, and steering assist oil pipe air leakage, the air leakage type is vehicle pipeline air leakage; if the electric vehicle has at least one air leakage of brake pump air leakage, brake pad air leakage, and brake pipeline air leakage, the air leakage type is brake pipeline air leakage.

[0091] In some embodiments, the type and rate determination module is further configured to determine the time interval between the start time of air leakage and the current time; determine the air pressure drop per unit time based on the difference between the first air pressure and the second air pressure, and the time interval; and use the air pressure drop as the air leakage rate.

[0092] In some embodiments, the power limitation module is further configured to determine the air leakage weight of the electric vehicle based on the air leakage type; determine the air leakage rate threshold corresponding to the air leakage weight based on a pre-set mapping relationship; and limit the power of the electric vehicle if the air leakage rate meets the air leakage rate threshold.

[0093] In some embodiments, the power limitation module is further configured to determine at least one air leakage mode included in the air leakage type of the electric vehicle; assign values to each of the at least one air leakage mode to obtain the initial air leakage weights corresponding to the air leakage modes; and sum up the initial air leakage weights to obtain the air leakage weight.

[0094] In some embodiments, the power limitation module is further configured to determine the torque limit value of the motor of the electric vehicle based on the current vehicle speed of the electric vehicle; and limit the power by the torque limit value of the motor.

[0095] In some embodiments, the motor is a permanent magnet synchronous motor, and the maximum power of the motor is 420 kW, and the peak torque is 2800 N·m.

[0096] In some embodiments, the power limitation module is further configured to not limit the torque limit value if the current vehicle speed is within a pre-set first interval; set the torque limit value to one-fourth if the current vehicle speed is within a pre-set second interval; and set the torque limit value to one-half if the current vehicle speed is within a pre-set third interval.

[0097] In some embodiments, the electric vehicle further includes a display instrument, and the power limitation module is further configured to activate the air leakage identifier of the electric vehicle; and display the corresponding fault information on the display instrument.

[0098] In some embodiments, the electric vehicle further includes a pressure sensor, and the pressure sensor is configured to collect the air pressure of the front axle air outlet cylinder and the air pressure of the rear axle air outlet cylinder, and the model of the pressure sensor is PT100.

[0099] The device provided by the embodiments of the present invention has the same implementation principle and technical effects as those of the foregoing method embodiments. For the sake of brief description, for the parts not mentioned in the device embodiments, reference may be made to the corresponding content in the foregoing method embodiments.

[0100] Embodiment 5

[0101] The embodiments of the present invention further provide an electronic device for running the above-mentioned drive protection control method for pure electric double-loop pneumatic braking; see Figure 5 the structural schematic diagram of an electronic device shown in the figure. The electronic device includes a memory 500 and a processor 501. Among them, the memory 500 is used to store one or more computer instructions, and the one or more computer instructions are executed by the processor 501 to implement the above-mentioned drive protection control method for pure electric double-loop pneumatic braking.

[0102] Furthermore, Figure 5 the electronic device shown in the figure further includes a bus 502 and a communication interface 503, and the processor 501, the communication interface 503 and the memory 500 are connected through the bus 502.

[0103] Among them, the memory 500 may include a high-speed random access memory (RAM, Random Access Memory), and may also include a non-volatile memory, such as at least one disk memory. Through at least one communication interface 503 (which may be wired or wireless), a communication connection is realized between the system network element and at least one other network element, and the Internet, wide area network, local area network, metropolitan area network, etc. can be used. The bus 502 may be an ISA bus, a PCI bus or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, Figure 5 only a bidirectional arrow is used in the figure, but it does not mean that there is only one bus or one type of bus.

[0104] The processor 501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in the processor 501 or the instructions in the form of software. The above-mentioned processor 501 may be a general-purpose processor, including a central processing unit (CPU for short), a network processor (NP for short), etc.; it may also be a digital signal processor (DSP for short), an application specific integrated circuit (ASIC for short), a field-programmable gate array (FPGA for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present invention can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of the hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. This storage medium is located in the memory 500, and the processor 501 reads the information in the memory 500 and combines its hardware to complete the steps of the method in the foregoing embodiments.

[0105] The embodiments of the present invention also provide a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to implement the above-mentioned drive protection control method for pure electric double-loop pneumatic braking. For the specific implementation, reference can be made to the method embodiments, and details are not described herein again.

[0106] The computer program product for the drive protection control method for pure electric double-loop pneumatic braking provided by the embodiments of the present invention includes a computer-readable storage medium storing non-volatile program code executable by a processor. The instructions included in the program code can be used to execute the method described in the foregoing method embodiments. For the specific implementation, reference can be made to the method embodiments, and details are not described herein again.

[0107] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

[0108] In several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some communication interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0109] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0110] In addition, in each embodiment of the present invention, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0111] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention. The foregoing storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, etc., which can store program codes.

[0112] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A drive protection control method for a pure - electric dual - circuit pneumatic brake, characterized in that Applied to an electric vehicle, the method includes: Obtain a first air pressure of the front axle air outlet cylinder and a second air pressure of the rear axle air outlet cylinder of the electric vehicle; Determine whether the electric vehicle is leaking air based on the first air pressure and the second air pressure; If the electric vehicle is leaking air, determine the type of air leak and the air leakage rate; Limit the power of the electric vehicle based on the type of air leak and the air leakage rate to protect the driving of the electric vehicle; Determining the air leakage rate includes: Determine the time interval between the start time of air leakage and the current time; Determine the amount of air pressure drop per unit time based on the difference between the first air pressure and the second air pressure and the time interval; Take the air pressure drop as the air leakage rate; The limiting the power of the electric vehicle based on the type of air leak and the air leakage rate includes: Determine the air leakage weight of the electric vehicle based on the type of air leak; Determine the air leakage rate threshold corresponding to the air leakage weight based on a pre-set mapping relationship; If the air leakage rate meets the air leakage rate threshold, limit the power of the electric vehicle; The limiting the power of the electric vehicle includes: Determine the torque limit value of the motor of the electric vehicle based on the current vehicle speed of the electric vehicle; Limit the power by the torque limit value of the motor; The determining the torque limit value of the motor of the electric vehicle based on the current vehicle speed of the electric vehicle includes: If the current vehicle speed is within a pre-set first interval, do not limit the torque limit value; If the current vehicle speed is within a pre-set second interval, set the torque limit value to one quarter; If the current vehicle speed is within a pre-set third interval, set the torque limit value to one half; Wherein, when the current vehicle speed is within 0 - 30 km / h, the torque limit value is not limited; when the current vehicle speed is within 31 - 60 km / h, the torque limit value is set to one quarter; when the current vehicle speed is greater than 60 km / h, the torque limit value is set to one half.

2. The method according to claim 1, characterized in that, The determining whether the electric vehicle is leaking air based on the first air pressure and the second air pressure includes: Obtain the initial first air pressure of the front axle air outlet cylinder and the initial second air pressure of the rear axle air outlet cylinder when the electric vehicle starts; Determine a first difference between the initial first air pressure and the initial second air pressure; Determine a second difference between the first air pressure and the second air pressure; Determine whether the electric vehicle is leaking air based on the first difference and the second difference.

3. The method according to claim 2, wherein The determining whether the electric vehicle is leaking air based on the first difference and the second difference includes: If the second difference is greater than a pre-set first air pressure threshold, determine that the electric vehicle is leaking air; If the second difference is less than or equal to the first air pressure threshold, determine whether the difference between the first difference and the second difference is greater than a pre-set second air pressure threshold; If the difference between the first difference and the second difference is greater than the second air pressure threshold, determine that the electric vehicle is leaking air.

4. The method according to claim 1, wherein The determining the type of air leak includes: If the air leakage mode of the electric vehicle is at least one of fuel pipe air leakage, lubricating oil pipe air leakage, cooling pipeline air leakage, and steering assist oil pipe air leakage, then the air leakage type is vehicle pipeline air leakage; If the electric vehicle has at least one air leakage of brake pump air leakage, brake pad air leakage, and brake pipeline air leakage, then the air leakage type is brake pipeline air leakage.

5. The method according to claim 1, characterized in that, Determining the air leakage weight of the electric vehicle based on the air leakage type includes: Determining at least one air leakage mode of the electric vehicle included in the air leakage type; Assigning values to at least one of the air leakage modes respectively to obtain the initial air leakage weights corresponding to various air leakage modes; Adding up the initial air leakage weights to obtain the air leakage weight.

6. The method according to claim 1, characterized in that The motor is a permanent magnet synchronous motor, and the maximum power of the motor is 420kW, and the peak torque is 2800N·m.

7. The method according to claim 1, characterized in that The electric vehicle further includes a display instrument. Before restricting the power of the electric vehicle, the method further includes: Activating the air leakage identifier of the electric vehicle; While restricting the power of the electric vehicle, the method further includes: Displaying the corresponding fault information on the display instrument.

8. The method according to claim 1, wherein The electric vehicle further includes a pressure sensor, which is used to collect the air pressure of the front axle air outlet cylinder and the air pressure of the rear axle air outlet cylinder, and the model of the pressure sensor is PT100.

9. A driving protection control device for a pure electric double-circuit air brake, characterized in that, Applied to an electric vehicle, used to implement the drive protection control method of pure electric double-loop air pressure braking described in any one of claims 1 to 8. The device includes: An air pressure acquisition module, configured to acquire the first air pressure of the front axle air outlet cylinder and the second air pressure of the rear axle air outlet cylinder of the electric vehicle; An air leakage determination module, configured to determine whether the electric vehicle leaks air based on the first air pressure and the second air pressure; A type and rate determination module, configured to determine the air leakage type and air leakage rate if the electric vehicle leaks air; A power restriction module, configured to restrict the power of the electric vehicle based on the air leakage type and the air leakage rate to provide drive protection for the electric vehicle.

10. An electronic device, characterized in that, Includes a processor and a memory. The memory stores computer-executable instructions that can be executed by the processor. The processor executes the computer-executable instructions to implement the drive protection control method of pure electric double-loop air pressure braking described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by the processor, the computer-executable instructions prompt the processor to implement the drive protection control method of pure electric double-loop air pressure braking described in any one of claims 1 to 8.

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