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

Abstract

The invention provides a driving protection control method and device for pure electric double-loop pneumatic braking, relates to the technical field of electric automobiles, is applied to the electric automobiles, and comprises the following steps: acquiring first air pressure of a front axle air outlet cylinder and second air pressure of a rear axle air outlet cylinder of the electric automobile; 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 an air leakage type and an air leakage rate; and limiting the power of the electric vehicle based on the air leakage type and the air leakage rate so as to carry out driving protection on the electric vehicle. In the mode, the power of the electric vehicle is limited through the air leakage type and the air leakage rate, the safety of the vehicle and 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 pure electric dual-circuit pneumatic braking. Background Art

[0002] As a new type of transportation, the safety of the braking system of electric vehicles is of vital importance. The braking system of electric vehicles usually includes front axle air reservoirs and rear axle air reservoirs for storing compressed air. When the driver steps on the brake pedal, the compressed air in the air reservoir is transported to the brake element through the pipeline to generate braking force. At the same time, the vehicle control unit (VCU) can monitor the air pressure of the air reservoir in real time through the air pressure sensor, so as to promptly detect and deal with the leakage of the vehicle pipeline or brake element.

[0003] However, although the relevant technology can monitor the operating status of the vehicle, when the braking system fails, it is often impossible to take protective measures in a timely and effective manner, thereby increasing the safety risks of the vehicle and the people inside the vehicle. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a drive protection control method and device for a pure electric dual-circuit pneumatic brake, which limits the power of an electric vehicle by leakage type and leakage rate, so as to improve the safety of the vehicle and the people in the vehicle and reduce safety risks.

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

[0006] In a preferred embodiment of the present invention, the above-mentioned determination of whether the electric vehicle has an air leak based on the first air pressure and the second air pressure includes: obtaining the initial first air pressure of the front axle air outlet and the initial second air pressure of the rear axle air outlet when the electric vehicle is started; 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 has an air leak based on the first difference and the second difference.

[0007] In a preferred embodiment of the present invention, the above-mentioned determination of whether the electric vehicle is leaking 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 is leaking; 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 the 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 is leaking.

[0008] In a preferred embodiment of the present invention, the above-mentioned determination of the leakage type includes: if the leakage of the electric vehicle is at least one of fuel pipe leakage, lubricating oil pipe leakage, cooling pipe leakage and power steering oil pipe leakage, then the leakage type is vehicle pipeline leakage; if the electric vehicle has at least one of brake pump leakage, brake pad leakage and brake pipe leakage, then the leakage type is brake pipe leakage.

[0009] In a preferred embodiment of the present invention, the above-mentioned determination of the leakage rate includes: determining the time interval between the time when the leakage starts and the current time; determining 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; and using the amount of air pressure drop as the leakage rate.

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

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

[0012] In a preferred embodiment of the present invention, the power of the electric vehicle is limited as described above, including: determining a torque limit of a motor of the electric vehicle based on a current speed of the electric vehicle; and limiting the power by the torque limit 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, the above-mentioned determination of the torque limit 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, the torque limit is not limited; if the current vehicle speed is within a pre-set second interval, the torque limit is set to one quarter; if the current vehicle speed is within a pre-set third interval, the torque limit is set to one half.

[0015] In a preferred embodiment of the present invention, the electric vehicle further includes a display instrument, and before limiting the power of the electric vehicle, the method further includes: activating a gas leakage indicator of the electric vehicle; while limiting the power of the electric vehicle, the method further includes: displaying corresponding fault information in the display instrument.

[0016] In a preferred embodiment of the present invention, the electric vehicle further comprises an air pressure sensor, which is used to collect the air pressure of the front axle air bag and the rear axle air bag, and the model of the air pressure sensor is PT100.

[0017] In the second aspect, an embodiment of the present invention also provides a driving protection control device for a pure electric dual-circuit pneumatic brake, which is applied to electric vehicles. The device includes: an air pressure acquisition module, which is used to acquire a first air pressure of a front axle air outlet and a second air pressure of a rear axle air outlet of the electric vehicle; a leakage determination module, which is used to determine whether the electric vehicle is leaking based on the first air pressure and the second air pressure; a type and rate determination module, which is used to determine the leakage type and leakage rate if the electric vehicle is leaking; and a power limiting module, which is used to limit the power based on the leakage type and leakage rate to provide driving protection for the electric vehicle.

[0018] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the drive protection control method of the pure electric dual-circuit pneumatic brake of the first aspect mentioned above.

[0019] In a fourth aspect, an embodiment of the present invention further provides 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 prompt the processor to implement the drive protection control method for the pure electric dual-circuit pneumatic brake of the first aspect mentioned above.

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

[0021] The embodiment of the present invention provides a driving protection control method and device for pure electric dual-circuit pneumatic brakes, which are applied to electric vehicles. By obtaining the first air pressure of the front axle outlet and the second air pressure of the rear axle outlet of the electric vehicle, it is determined whether the electric vehicle is leaking based on the first air pressure and the second air pressure. If the electric vehicle is leaking, the type and rate of the leak are determined, and the power of the electric vehicle is limited based on the type and rate of the leak to protect the driving of the electric vehicle. In this way, the power of the electric vehicle is limited by the type and rate of the leak, which improves the safety of the vehicle and the people in the vehicle and reduces the safety risks.

[0022] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0023] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A flow chart 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 A flow chart of another driving protection control method of a pure electric dual-circuit pneumatic brake provided by an embodiment of the present invention;

[0027] Figure 3a A flow chart of another driving protection control method of a pure electric dual-circuit pneumatic brake provided by an embodiment of the present invention;

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

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

[0030] Figure 5 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] As a new type of transportation, the safety of the braking system of electric vehicles is of vital importance. The braking system of electric vehicles usually includes front axle air reservoirs and rear axle air reservoirs for storing compressed air. When the driver steps on the brake pedal, the compressed air in the air reservoir is transported to the brake element through the pipeline to generate braking force. At the same time, the vehicle control unit (VCU) can monitor the air pressure of the air reservoir in real time through the air pressure sensor, so as to promptly detect and deal with the leakage of the vehicle pipeline or brake element.

[0033] However, although the relevant technology can monitor the operating status of the vehicle, when the braking system fails, it is often impossible to take protective measures in a timely and effective manner, thereby increasing the safety risks of the vehicle and the people inside the vehicle.

[0034] Based on this, a pure electric dual-circuit pneumatic brake drive protection control method and device provided in an embodiment of the present invention can obtain the first air pressure of the front axle outlet and the second air pressure of the rear axle outlet of the electric vehicle, determine whether the electric vehicle is leaking based on the first air pressure and the second air pressure, and if the electric vehicle is leaking, determine the type and rate of the leak, and limit the power of the electric vehicle based on the type and rate of the leak to protect the electric vehicle. In this way, the power of the electric vehicle is limited by the type and rate of the leak, which improves the safety of the vehicle and the people in the vehicle and reduces the safety risk.

[0035] To facilitate understanding of this embodiment, a driving protection control method for a pure electric dual-circuit pneumatic brake disclosed in an embodiment of the present invention is first introduced in detail.

[0036] Example 1

[0037] The embodiment of the present invention provides a driving protection control method of a pure electric dual-circuit pneumatic brake, which is applied to electric vehicles. Figure 1 The present invention provides a flow chart of a driving protection control method for a pure electric dual-circuit pneumatic brake. Figure 1 As shown, the driving protection control method of the pure electric dual-circuit pneumatic brake may include the following steps:

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

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

[0040] Step S102, determining whether the electric vehicle has an air leak 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. When the difference exceeds the normal range, it is considered that the electric vehicle is leaking. If the difference does not exceed the normal range, the difference between the first air pressure before the electric vehicle is started and the second air pressure before the electric vehicle is started is determined. When the difference exceeds the normal range, it is considered that the electric vehicle is leaking.

[0042] Step S103: if the electric vehicle has a gas leak, determine the type and rate of the gas leak.

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

[0044] Among them, the leakage mode of the electric vehicle can be determined by a device with a leakage detection function, and can also be determined by manual detection.

[0045] In the case of manual inspection, for leaks in the vehicle pipeline, the specific location of the leak must be determined first, such as by observation, listening, applying soapy water, and using professional testing instruments. You can observe whether there are obvious oil stains, stains, or signs of damage on the surface of the pipeline; when the electric car is stationary, listen carefully for the sound of gas leakage; apply soapy water to the suspected leaking part to observe whether bubbles are generated; accurately locate the leak through a gas leak detector, etc. For brake line leaks, first check whether the various components of the brake system, such as brake pads, brake pumps, brake lines, etc., are intact, and pay special attention to checking whether the brake lines have cracks, wear, or poor connections. You can also use observation, listening, applying soapy water, and using professional testing instruments to determine the leak location.

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

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

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

[0049] For example, when the fuel pipe leaks, since fuel is a flammable substance and there are serious safety hazards, the vehicle should be stopped from use immediately and professional maintenance personnel should be contacted for repairs; when the lubricating oil pipe leaks, the lubricating oil will be lost, affecting the lubrication effect of mechanical parts, so the lubricating oil pipe should be checked for aging, wear or looseness, and replaced or tightened in time; when the cooling line leaks, the cooling effect of the engine will be affected and the engine will overheat, so the cooling line should be checked for cracks, looseness or poor connection, and repaired in time; when the brake pump leaks, the sealing performance of the brake pump should be checked for good, and the brake pump should be replaced if necessary; when the brake pad leaks, check whether the brake pad is severely worn or improperly installed, and whether the brake cylinder is leaking. If necessary, the brake pad should be replaced or the brake cylinder should be repaired; when the brake line leaks, the condition of the brake line should be checked, and the damaged parts should be replaced or repaired in time.

[0050] Nevertheless, there may still be a situation where it is impossible to stop the vehicle for maintenance due to a gas leak. In this case, it is necessary to limit the power to the most appropriate range according to the impact of different gas leak modes on the electric vehicle, so as to ensure that the electric vehicle can reach a parking position quickly and safely.

[0051] The driving protection control method of the pure electric dual-circuit pneumatic brake provided in the embodiment of the present invention can obtain the first air pressure of the front axle air outlet of the electric vehicle and the second air pressure of the rear axle air outlet, determine whether the electric vehicle is leaking based on the first air pressure and the second air pressure, and if the electric vehicle is leaking, determine the type and rate of the leak, and limit the power of the electric vehicle based on the type and rate of the leak to protect the driving of the electric vehicle. In this way, the power of the electric vehicle is limited by the type and rate of the leak, which improves the safety of the vehicle and the people in the vehicle and reduces the safety risk.

[0052] Example 2

[0053] An embodiment of the present invention also provides another drive protection control method for pure electric dual-circuit pneumatic braking; this method is implemented on the basis of the method in the above embodiment; this method focuses on describing the specific implementation method of determining whether an electric vehicle is leaking based on the first air pressure and the second air pressure.

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

[0055] Step S201, obtaining an initial first air pressure of a front axle air outlet and an initial second air pressure of a rear axle air outlet when the electric vehicle is started.

[0056] It should be noted that before the electric vehicle is started, there may be a difference in the air pressure of the front axle outlet bag and the air pressure of the rear axle outlet bag. Therefore, the difference in air pressure between the front and rear axle outlet bags cannot be used as the basis for judging whether there is a leak.

[0057] Step S202, determining a first difference between an initial first air pressure and an initial second air pressure.

[0058] The initial first air pressure and the initial second air pressure are subtracted to obtain a first difference.

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

[0060] The first air pressure is subtracted from the second air pressure to obtain a second difference value.

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

[0062] Specifically, determining whether the electric vehicle is leaking air based on the first difference and the second difference may include: if the second difference is greater than a preset first air pressure threshold, determining that the electric vehicle is leaking air; 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 the 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 is leaking air.

[0063] When the first difference exceeds the normal range, that is, exceeds the first pressure threshold, it can be considered that the electric vehicle is leaking. When the difference between the first difference and the second difference exceeds the normal range, that is, exceeds the second pressure threshold, it can be considered that the electric vehicle is leaking.

[0064] The driving protection control method for pure electric dual-circuit pneumatic braking provided in an embodiment of the present invention can determine whether an electric vehicle has an air leak through a first difference and a second difference, thereby improving the accuracy of air leak detection. Furthermore, when an electric vehicle is determined to have an air leak, corresponding power limitations are adopted, thereby improving the safety of the vehicle and the people inside the vehicle and reducing safety risks.

[0065] Example 3

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

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

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

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

[0070] Among them, since each leakage mode has different influences on the electric vehicle, different importance coefficients can be set for different leakage modes, that is, assigned as the initial leakage weight of the leakage mode. When the electric vehicle has only one leakage mode, the initial leakage weight is used as the leakage weight; when the electric vehicle has multiple leakage modes, the initial leakage weights of the multiple leakage modes are added together to obtain the leakage weight.

[0071] Step S302: determining a leakage rate threshold corresponding to the leakage weight based on a preset mapping relationship.

[0072] The greater the leakage weight, the greater the impact on the safety of the electric vehicle, and therefore 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 preset.

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

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

[0075] Among them, determining the torque limit 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 pre-set first interval, no restriction is imposed on the torque limit; if the current vehicle speed is within a pre-set second interval, the torque limit is set to one quarter; if the current vehicle speed is within a pre-set third interval, the torque limit is set to one half.

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

[0077] Furthermore, the electric vehicle may also include a display instrument. Before limiting the power of the electric vehicle, a gas leakage indicator of the electric vehicle may be activated. While limiting the power of the electric vehicle, corresponding fault information may be displayed in the display instrument.

[0078] For ease of understanding, Figure 3b A driving protection control logic diagram of a pure electric dual-circuit pneumatic brake provided by an embodiment of the present invention is shown in FIG. Figure 3b As shown, during the driving of the electric vehicle, the VCU monitors the first air pressure of the front axle air outlet and the second air pressure of the rear axle air outlet through the air pressure sensor. After confirming the air leakage, the type of air leakage is determined by a device with an air leakage detection function, and the corresponding air leakage rate threshold is determined by 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 mark of the electric vehicle is activated, and when the air leakage rate is less than the corresponding air leakage rate threshold, no processing is performed; after activating the air leakage mark of the electric vehicle, the VCU transmits the information to the display instrument through the CAN line, so that the fault information is displayed on the display instrument; at the same time, the VCU forwards the torque limit value through the CAN line according to the current speed of the electric vehicle, the shift controller controls the motor controller to limit the power, and the motor executes the power limit, thereby improving the overall safety of the electric vehicle, thereby protecting the safety of occupants and pedestrians.

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

[0080] The driving protection control method for pure electric dual-circuit pneumatic braking provided in an embodiment of the present invention can limit the power of an electric vehicle by leakage type and leakage rate, so that different leakage weights correspond to different leakage rate thresholds, so as to limit the power of the electric vehicle, avoid the acceleration of the leakage rate, thereby improving the overall safety of the electric vehicle and reducing safety risks.

[0081] Example 4

[0082] Corresponding to the above method embodiment, the embodiment of the present invention provides a pure electric dual-circuit pneumatic brake drive protection control device, which is applied to electric vehicles. Figure 4 ,like Figure 4 As shown, the driving protection control device of the pure electric dual-circuit pneumatic brake may include:

[0083] The air pressure acquisition module 401 is used to acquire a first air pressure of a front axle air outlet and a second air pressure of a rear axle air outlet of the electric vehicle.

[0084] The air leakage determination module 402 is used to determine whether the electric vehicle has an air leakage based on the first air pressure and the second air pressure.

[0085] The type and rate determination module 403 is used to determine the type and rate of leakage if the electric vehicle has leakage.

[0086] The power limiting module 404 is used to limit the power based on the leakage type and leakage rate to provide driving protection for the electric vehicle.

[0087] The driving protection control device of the pure electric dual-circuit pneumatic brake provided in the embodiment of the present invention can obtain the first air pressure of the front axle air outlet of the electric vehicle and the second air pressure of the rear axle air outlet, determine whether the electric vehicle is leaking based on the first air pressure and the second air pressure, and if the electric vehicle is leaking, determine the type and rate of the leak, and limit the power of the electric vehicle based on the type and rate of the leak, so as to provide driving protection for the electric vehicle. In this way, the power of the electric vehicle is limited by the type and rate of the leak, which improves the safety of the vehicle and the people in the vehicle and reduces the safety risk.

[0088] In some embodiments, the air leakage determination module is also used to obtain the initial first air pressure of the front axle air outlet and the initial second air pressure of the rear axle air outlet when the electric vehicle is started; determine the first difference between the initial first air pressure and the initial second air pressure; determine the second difference between the first air pressure and the second air pressure; and determine whether the electric vehicle has an air leakage based on the first difference and the second difference.

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

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

[0091] In some embodiments, the type and rate determination module is also used to determine the time interval between the time when the leakage starts 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; and use the air pressure drop as the leakage rate.

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

[0093] In some embodiments, the power limiting module is further used to determine at least one leakage mode of the electric vehicle included in the leakage type; assign values ​​to at least one leakage mode respectively to obtain initial leakage weights corresponding to various leakage modes; and add the initial leakage weights to obtain the leakage weight.

[0094] In some embodiments, the power limiting module is further used to determine the torque limit of the motor of the electric vehicle based on the current speed of the electric vehicle; and to limit the power by the torque limit 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 limiting module is also used to not limit the torque limit if the current vehicle speed is within a preset first interval; to limit the torque limit to one quarter if the current vehicle speed is within a preset second interval; and to limit the torque limit to one half if the current vehicle speed is within a preset third interval.

[0097] In some embodiments, the electric vehicle further includes a display instrument and a power limiting module, which is also used to activate a gas leakage indicator of the electric vehicle; and display corresponding fault information in the display instrument.

[0098] In some embodiments, the electric vehicle further includes an air pressure sensor, which is used to collect the air pressure of the front axle outlet bag and the rear axle outlet bag, and the model of the air pressure sensor is PT100.

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

[0100] Example 5

[0101] The embodiment of the present invention also provides an electronic device for running the above-mentioned pure electric dual-circuit pneumatic brake drive protection control method; see Figure 5 A structural schematic diagram of an electronic device is shown, which includes a memory 500 and a processor 501, wherein 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 pure electric dual-circuit pneumatic brake drive protection control method.

[0102] Further, Figure 5 The electronic device shown further includes a bus 502 and a communication interface 503 , and the processor 501 , the communication interface 503 and the memory 500 are connected via the bus 502 .

[0103] The memory 500 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 503 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may 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 ease of representation, Figure 5 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only 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 hardware integrated logic circuit or software instructions in the processor 501. The above processor 501 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature 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. The storage medium is located in the memory 500, and the processor 501 reads the information in the memory 500 and completes the steps of the method of the above embodiment in combination with its hardware.

[0105] An embodiment of the present invention also provides 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 prompt the processor to implement the above-mentioned pure electric dual-circuit pneumatic brake drive protection control method. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0106] The computer program product of the drive protection control method for pure electric dual-circuit pneumatic braking provided in the embodiment of the present invention includes a computer-readable storage medium storing a 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 previous method embodiment. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0107] 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.

[0108] In the 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

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

[0110] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may 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 that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0112] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; 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 be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A driving protection control method for pure electric dual-circuit pneumatic brake, characterized in that: Applied to electric vehicles, the method comprises: Acquire a first air pressure of a front axle outlet and a second air pressure of a rear axle outlet of the electric vehicle; determining whether the electric vehicle has an air leak based on the first air pressure and the second air pressure; If the electric vehicle leaks, determine the type and rate of the leak; The power of the electric vehicle is limited based on the gas leakage type and the gas leakage rate to perform driving protection on the electric vehicle.

2. The method according to claim 1, characterized in that: The determining whether the electric vehicle has an air leak based on the first air pressure and the second air pressure includes: Acquire an initial first air pressure of the front axle air outlet and an initial second air pressure of the rear axle air outlet when the electric vehicle is started; 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; It is determined whether the electric vehicle has an air leak based on the first difference and the second difference.

3. The method according to claim 2, characterized in that The determining whether the electric vehicle has a gas leak based on the first difference and the second difference includes: If the second difference is greater than a preset first air pressure threshold, it is determined that the electric vehicle is leaking air; 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, it is determined that the electric vehicle has an air leak.

4. The method according to claim 1, characterized in that The determining of the leakage type comprises: If the leakage of the electric vehicle is at least one of a fuel pipe leakage, a lubricating oil pipe leakage, a cooling pipe leakage and a power steering oil pipe leakage, the leakage type is a whole vehicle pipe leakage; If the electric vehicle has at least one of brake pump leakage, brake pad leakage and brake line leakage, the leakage type is brake line leakage.

5. The method according to claim 1, characterized in that Determine the leak rate, including: Determine the time interval between the time when the air leakage starts 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; The amount of the gas pressure drop is taken as the gas leakage rate.

6. The method according to claim 1, characterized in that The limiting the power of the electric vehicle based on the leakage type and the leakage rate includes: Determining a gas leakage weight of the electric vehicle based on the gas leakage type; Determine a leakage rate threshold corresponding to the leakage weight based on a preset mapping relationship; If the leakage rate meets the leakage rate threshold, the power of the electric vehicle is limited.

7. The method according to claim 6, characterized in that The determining the gas leakage weight of the electric vehicle based on the gas leakage type includes: Determining that the electric vehicle includes at least one gas leakage mode among the gas leakage types; Assigning values ​​to at least one of the leakage modes respectively to obtain initial leakage weights corresponding to the leakage modes; The initial leakage weights are summed to obtain the leakage weight.

8. The method according to claim 6, characterized in that The limiting the power of the electric vehicle comprises: determining a torque limit value of a motor of the electric vehicle based on a current vehicle speed of the electric vehicle; The power is limited by a torque limitation of the electric machine.

9. The method according to claim 8, characterized in that 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.

10. The method according to claim 8, characterized in that The step of determining the torque limit of the motor of the electric vehicle based on the current speed of the electric vehicle comprises: If the current vehicle speed is within a preset first interval, the torque limit value is not limited; If the current vehicle speed is within a preset second interval, the torque limit is set to one quarter; If the current vehicle speed is within a preset third interval, the torque limit is set to one-half.

11. The method according to claim 6, characterized in that The electric vehicle further includes a display instrument. Before limiting the power of the electric vehicle, the method further includes: activating a gas leak indicator of the electric vehicle; While limiting the power of the electric vehicle, the method further includes: The corresponding fault information is displayed in the display instrument.

12. The method according to claim 1, characterized in that The electric vehicle also includes an air pressure sensor, which is used to collect the air pressure of the front axle air outlet and the air pressure of the rear axle air outlet. The model of the air pressure sensor is PT100.

13. A pure electric dual-circuit pneumatic brake drive protection control device, characterized in that: Applied to electric vehicles, the device comprises: An air pressure acquisition module, used for acquiring a first air pressure of a front axle air outlet and a second air pressure of a rear axle air outlet of the electric vehicle; A gas leakage determination module, configured to determine whether the electric vehicle has a gas leakage based on the first gas pressure and the second gas pressure; A type and rate determination module, used to determine the type and rate of leakage if the electric vehicle leaks air; The power limiting module is used to limit the power based on the leakage type and the leakage rate to provide driving protection for the electric vehicle.

14. An electronic device, characterized in that: It comprises a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the driving protection control method of the pure electric dual-circuit pneumatic brake as described in any one of claims 1 to 12.

15. 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 for the pure electric dual-circuit pneumatic brake as described in any one of claims 1 to 12.

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