Auxiliary braking control method and system and vehicle

Abstract

The invention discloses an auxiliary braking control method and system and a vehicle, and the method is executed by an auxiliary braking controller and comprises the steps that vehicle driving parameters and a vehicle slope state are obtained; and when the vehicle driving parameters meet the preset conditions and the vehicle slope state is in the downhill state, it is judged that the auxiliary brake starting conditions are met, and exhaust brake control and engine brake control are started. According to the auxiliary braking system, the mechanical pump engine can still conduct auxiliary braking under the condition that no ECU exists, it can be ensured that the auxiliary braking function is timely, effectively and reasonably started and stopped, and meanwhile the main braking intervention requirement judgment capacity, the upshift requirement judgment capacity and the overproof engine protection alarm capacity are achieved.

Description

Technical Field

[0001] The present invention belongs to the field of vehicle electrical technology, and in particular relates to an auxiliary braking control method, a control system and a vehicle. Background Art

[0002] Mechanical pump engines without ECU have the advantages of being simple and reliable, easy to maintain and repair, and having low requirements for oil quality. However, since mechanical pump engines do not have ECU control, many fine control functions cannot be realized. If the driver does not take braking measures and change to the appropriate gear in time on a long downhill section, the engine will be damaged by overspeed. In addition, drivers often use exhaust brakes (auxiliary brakes) as brakes, resulting in various problems such as a high exhaust brake damage rate.

[0003] The prior art often targets engines with ECUs to finely control the braking torque of exhaust brakes or engine brakes, or multi-mode control of auxiliary brakes and other functions, but there is no solution to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide an auxiliary braking control method, a control system and a vehicle, which enable a mechanical pump engine to perform auxiliary braking without an ECU, and can ensure that the auxiliary braking function is opened and closed in a timely, effective and reasonable manner, while also having the ability to determine the need for main braking intervention, the need for upshifting, and the ability to provide an alarm for over-standard engine protection.

[0005] The present invention provides the following technical solutions: In a first aspect, an auxiliary braking control method is provided, which is executed by an auxiliary braking controller, comprising: Obtain vehicle driving parameters and vehicle slope status; When the vehicle driving parameters meet the preset conditions and the vehicle slope is in a downhill state, it is determined that the auxiliary brake activation conditions are met, and the exhaust brake control and the engine brake control are activated; Wherein, the exhaust brake control and engine brake control include: When the engine speed and vehicle speed are within a preset range, brake torque calculation and deceleration calculation are performed, and it is determined whether exhaust braking and / or engine braking is appropriate to be activated based on the calculation results; If it is appropriate to start the exhaust brake and / or the engine brake, start the exhaust brake and / or the engine brake, and obtain the engine speed and the vehicle speed in real time; If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are requested, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination; If the engine speed and / or vehicle speed still exceeds the preset value after the cyclic judgment, the speed and / or vehicle speed over-limit alarm will be activated.

[0006] Furthermore, the vehicle driving parameters include: engine speed, vehicle speed, gear status and auxiliary brake handle status.

[0007] Furthermore, the vehicle driving parameters meeting preset conditions include: the engine speed is greater than the idle value, the vehicle speed is greater than the auxiliary brake opening threshold, the gear is in the forward gear, and the auxiliary brake handle is in the open state.

[0008] Furthermore, the exhaust brake control includes: Determine whether the engine speed and vehicle speed are within a preset range, and if the engine speed and / or vehicle speed are not within the preset range, activate a speed and / or vehicle speed over-limit alarm; If the engine speed and vehicle speed are within the preset range, the brake torque calculation and deceleration calculation are performed, and it is determined whether it is appropriate to start the exhaust brake based on the calculation results; If it is not suitable to start the exhaust brake, an alarm will be sounded and an application will be made to exit the auxiliary brake; If it is appropriate to start the exhaust brake, start the exhaust brake and obtain the engine speed and vehicle speed in real time during the exhaust brake process; If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are requested, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination; If the engine speed and / or vehicle speed still exceeds the preset value after the cyclic judgment, the speed and / or vehicle speed over-limit alarm will be activated.

[0009] Furthermore, the engine brake control includes: Determine whether the engine speed and vehicle speed are within a preset range, and if the engine speed and / or vehicle speed are not within the preset range, activate a speed and / or vehicle speed over-limit alarm; If the engine speed and vehicle speed are within the preset range, the braking torque and deceleration calculations are performed, and it is determined whether it is appropriate to start the engine brake based on the calculation results; If it is not suitable to start the engine brake, an alarm will be sounded and an application will be made to exit the auxiliary brake; If it is appropriate to start the engine brake, start the engine brake, start the flameout limit and start the flameout fuel cut-off, and obtain the engine speed and vehicle speed in real time during the engine braking process; If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are requested, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination; If the engine speed and / or vehicle speed still exceeds the preset value after the cyclic judgment, the speed and / or vehicle speed over-limit alarm will be activated.

[0010] Furthermore, the engine brake control also includes: when exiting the auxiliary brake, closing the flameout limit and closing the flameout and fuel cut-off.

[0011] Furthermore, the engine braking control also includes: after shutting down the flameout and cutting off the fuel supply, determining whether the engine speed is lower than the idle value; if the engine speed is lower than the idle value, re-issuing the start signal to control the engine speed to increase and restore the engine start state.

[0012] In a second aspect, an auxiliary braking control system is provided, comprising: Collection instrument, used to collect vehicle driving parameters; A slope meter, used to collect the vehicle slope status; Auxiliary brake mechanism, used for exhaust brake and engine brake; Siren, used for making an alarm; The auxiliary brake controller is connected to the data collection instrument, the incline meter, the auxiliary brake mechanism and the alarm respectively, and is used to execute the auxiliary brake control method described in the first aspect.

[0013] Furthermore, it also includes a main brake mechanism, a starter circuit and a flameout limiter respectively connected to the auxiliary brake controller; The main brake mechanism is used to send a main brake switch state signal to the auxiliary brake controller and receive a main brake application signal from the auxiliary brake controller.

[0014] In a third aspect, a vehicle is provided, which uses the method described in the first aspect to perform auxiliary braking control, or includes the auxiliary braking control system described in the second aspect.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The auxiliary brake control method provided by the present invention is executed by an auxiliary brake controller. By acquiring the vehicle driving parameters and the vehicle slope state, when the vehicle driving parameters meet the preset conditions and the vehicle slope state is in a downhill state, it is determined that the auxiliary brake opening conditions are met, and the exhaust brake control and the engine brake control are turned on, so that the mechanical pump engine can still perform auxiliary braking without an ECU, and a dual auxiliary brake control mode of exhaust brake control and engine brake control can be realized, thereby improving the adaptability of different auxiliary brake functions; in addition, taking the vehicle slope state being in a downhill state as one of the auxiliary brake opening conditions can ensure that the auxiliary brake function is turned on and off in a timely, effective and reasonable manner; (2) When the exhaust brake control and engine brake control are performed, the present invention performs brake torque calculation and deceleration calculation when the engine speed and vehicle speed are within a preset range, and determines whether it is appropriate to start the exhaust brake and / or engine brake according to the calculation results, thereby ensuring that the auxiliary brake is turned on in time, thereby avoiding vehicle damage and safety problems caused by failure to turn on the auxiliary function in time; (3) When performing exhaust brake control and engine brake control, the present invention obtains the engine speed and vehicle speed in real time. If the engine speed and / or vehicle speed exceeds a preset value, an alarm is sounded and a main brake and upshift are requested. Therefore, the present invention has the ability to determine the need for main brake intervention and the ability to determine the need for upshift, ensuring that the driver is reminded to take correct measures in a timely and effective manner to protect the engine, avoid vehicle failure and effectively limit the vehicle speed. At the same time, the present invention also has the ability to provide an alarm for over-limit engine protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a flow chart for determining auxiliary brake activation conditions in an embodiment of the present invention; Figure 2 is a schematic diagram of the flow of exhaust brake control in an embodiment of the present invention; Figure 3 is a schematic flow chart of engine brake control in an embodiment of the present invention; Figure 4 It is a principle topological diagram of the auxiliary braking control system in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] The term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the associated objects are in an "or" relationship.

[0019] Example 1

[0020] This embodiment provides an auxiliary braking control method, which is executed by an auxiliary braking controller, and the steps are as follows: Step 1: Obtain vehicle driving parameters and vehicle slope status.

[0021] Step 2: When the vehicle driving parameters meet the preset conditions and the vehicle slope state is in a downhill state, it is determined that the auxiliary brake activation conditions are met, and the exhaust brake control and the engine brake control are activated.

[0022] Wherein, the exhaust brake control and engine brake control include: When the engine speed and vehicle speed are within a preset range, brake torque calculation and deceleration calculation are performed, and it is determined whether exhaust braking and / or engine braking is appropriate to be activated based on the calculation results; If it is appropriate to start the exhaust brake and / or the engine brake, start the exhaust brake and / or the engine brake, and obtain the engine speed and the vehicle speed in real time; If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are requested, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination; If the engine speed and / or vehicle speed still exceeds the preset value after the cyclic judgment, the speed and / or vehicle speed over-limit alarm will be activated.

[0023] Example 2

[0024] This embodiment provides an auxiliary braking control method, which is executed by an auxiliary braking controller, and the steps are as follows: Step 1: Obtain vehicle driving parameters and vehicle slope status.

[0025] The vehicle driving parameters include: engine speed, vehicle speed, gear status and auxiliary brake handle status.

[0026] Step 2: Figure 1 As shown, when the vehicle driving parameters meet the preset conditions and the vehicle slope state is in a downhill state, it is determined that the auxiliary braking activation conditions are met, and the exhaust brake control and engine brake control are turned on; if the vehicle slope state is not suitable for braking, an alarm is issued to remind the driver to perform the main brake.

[0027] The vehicle driving parameters meeting the preset conditions include: (1) The engine speed is greater than the idle speed, that is, the engine is in normal operation; (2) The vehicle speed is greater than the auxiliary braking threshold. The auxiliary braking threshold can be confirmed through experimental test calibration to ensure that the auxiliary braking can obtain the ideal braking torque. When it is lower than this value, the auxiliary braking effect will drop sharply and no longer have a significant auxiliary braking effect; (3) The gear is in the forward gear. When the vehicle gear is in neutral or reverse gear mode, the engine is disconnected from the vehicle resistance load and cannot effectively transmit the auxiliary braking force to achieve the purpose of reducing the vehicle speed; (4) The auxiliary brake handle is in the open position.

[0028] Furthermore, taking the vehicle's downhill slope as one of the conditions for activating the auxiliary brake can ensure that the auxiliary brake function is activated and deactivated in a timely, effective and reasonable manner.

[0029] like Figure 2 As shown, the steps of the exhaust brake control method are as follows: Step 2.1.1: Determine whether the engine speed and vehicle speed are within a preset range. If the engine speed and / or vehicle speed are not within the preset range, activate a speed and / or vehicle speed over-limit alarm.

[0030] Step 2.1.2: If the engine speed and vehicle speed are within the preset range, the braking torque calculation and deceleration calculation are performed, and it is determined whether it is appropriate to start the exhaust brake based on the calculation results.

[0031] Among them, the calibration table through experimental testing can obtain the range of brake torque values ​​under the engine speed and vehicle speed and determine the appropriate time period for starting auxiliary braking. Specifically, through engine bench test calibration, the brake torque values ​​obtained by the corresponding auxiliary braking tested at different engine speeds are obtained. For example, the longitudinal direction of the table is the engine speed, and the lateral direction is the auxiliary brake torque value measured at the corresponding speed, thereby forming a calibration table. Furthermore, through the parameter calculation of the vehicle speed ratio, it can be known that under the corresponding vehicle speed and the corresponding engine speed, the gearbox speed ratio at this time can be calculated, and the power chain transmission speed ratio of the vehicle can be obtained in combination with the drive axle speed ratio. Therefore, another parameter table can be calculated, that is, the corresponding relationship table between the engine speed and the vehicle speed at a certain gear. On the premise of presetting a reasonable and available auxiliary braking torque value range, by querying the above two tables, it can be known whether the auxiliary braking torque at the corresponding engine speed and vehicle speed meets the activation conditions, that is, whether the auxiliary braking torque is large enough to be worth turning on the function. If the auxiliary braking torque value is too small, there is no need to turn on the function; if the vehicle speed and the engine speed are too high, the auxiliary braking torque value is too large. If it is turned on, it is easy to damage the auxiliary braking system and the engine system, which also needs to be avoided and is prohibited from being turned on.

[0032] The theoretical braking torque acting on the wheel can be calculated through the auxiliary braking torque at the corresponding engine speed and vehicle speed and the transmission speed ratio of the vehicle power chain. The required deceleration value (i.e. negative acceleration) can be obtained according to the acceleration calculation formula. By determining the changing trend of the vehicle deceleration, it can be determined whether the engine speed and vehicle speed will exceed the standard and become out of control after a specific period of time, and the corresponding alarm value can be provided in time.

[0033] Step 2.1.3: If it is not appropriate to start the exhaust brake, an alarm will be sounded and an application will be made to exit the auxiliary brake.

[0034] Step 2.1.4: If it is appropriate to start the exhaust brake, start the exhaust brake and obtain the engine speed and vehicle speed in real time during the exhaust brake process.

[0035] Step 2.1.5: If the engine speed and / or vehicle speed exceeds the preset value, or has a tendency to exceed the preset value, an alarm is issued and a main brake and upshift are applied, and then the braking torque calculation and deceleration calculation are performed again to perform a cyclic determination.

[0036] By determining the need for main brake intervention and the need for upshifting, the system ensures that the driver is reminded to take correct measures in a timely and effective manner to protect the engine, avoid vehicle failures and effectively limit the vehicle speed. It also has the ability to provide an alarm for excessive engine protection.

[0037] Step 2.1.6: If the engine speed and / or vehicle speed still exceeds the preset value after the cycle determination, the speed and / or vehicle speed over-limit alarm is activated.

[0038] like Figure 3 As shown, the engine brake control method steps are as follows: Step 2.2.1: Determine whether the engine speed and vehicle speed are within a preset range. If the engine speed and / or vehicle speed are not within the preset range, activate a speed and / or vehicle speed over-limit alarm.

[0039] Step 2.2.2: If the engine speed and vehicle speed are within the preset range, the braking torque calculation and deceleration calculation are performed, and it is determined whether it is appropriate to start the engine braking based on the calculation results.

[0040] The calculation methods of braking torque and deceleration are the same as those in step 2.1.2.

[0041] Step 2.2.3: If it is not suitable to start the engine brake, an alarm will be sounded and an application will be made to exit the auxiliary brake. When exiting the auxiliary brake, close the flameout limiter and the flameout fuel cut-off to restore normal fuel supply; then determine whether the engine speed is lower than the idle value; if the engine speed is lower than the idle value, re-send the start signal to control the engine speed to increase and restore the engine start state.

[0042] Step 2.2.4: If it is appropriate to start engine braking, start engine braking, and start the flameout limit to ensure that the flameout valve is in its working state, start flameout and fuel cut-off, maintain the minimum fuel supply state, and maintain the engine running continuously under the inertia of the vehicle going downhill; in addition, obtain the engine speed and vehicle speed in real time during the engine braking process.

[0043] Step 2.2.5: If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are applied, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination.

[0044] Step 2.2.6: If the engine speed and / or vehicle speed still exceeds the preset value after the cycle determination, the speed and / or vehicle speed over-limit alarm is activated.

[0045] The auxiliary braking control method provided by the present invention is executed by an auxiliary braking controller, which obtains the vehicle driving parameters and the vehicle slope state. When the vehicle driving parameters meet the preset conditions and the vehicle slope state is in a downhill state, it is determined that the auxiliary braking start-up conditions are met, and the exhaust brake control and the engine brake control are turned on, so that the mechanical pump engine can still perform auxiliary braking without an ECU, and can realize a dual auxiliary braking control mode of exhaust brake control and engine brake control, thereby improving the adaptability of different auxiliary braking functions; in addition, taking the vehicle slope state being in a downhill state as one of the auxiliary braking start-up conditions can ensure that the auxiliary braking function is turned on and off in a timely, effective and reasonable manner.

[0046] Example 3

[0047] like Figure 4 As shown, this embodiment provides an auxiliary brake control system, including an auxiliary brake controller and a data collection instrument, a slope meter, an auxiliary brake mechanism, a main brake mechanism and an alarm respectively connected to the auxiliary brake controller.

[0048] The acquisition instrument is used to collect vehicle driving parameters and send the parameter information to the auxiliary brake controller. Specifically, the acquisition instrument is equipped with a vehicle speed sensor for measuring vehicle speed and a speed sensor for measuring engine speed. The acquisition instrument is also used to collect the vehicle gear status.

[0049] The incline meter is used to collect the vehicle's slope status and send the slope status to the auxiliary brake controller. The incline meter can measure the road slope value or the vehicle's driving inclination angle to confirm the vehicle's slope status, such as uphill, downhill or flat road.

[0050] The auxiliary braking mechanism, including an exhaust brake valve, an in-cylinder brake valve, a flameout control valve, an auxiliary brake handle, etc., is used to send an auxiliary brake switch (such as an auxiliary brake handle) status signal to the auxiliary brake controller, and receive an auxiliary brake start signal from the auxiliary brake controller to perform exhaust braking and engine braking.

[0051] The main brake mechanism is used to send a main brake switch status signal to the auxiliary brake controller and receive a main brake application signal from the auxiliary brake controller so that the driver can perform active braking.

[0052] The alarm, such as a buzzer, is used to receive a signal from the auxiliary brake controller to give an alarm.

[0053] The auxiliary brake controller is used to execute the auxiliary brake control method described in Example 1 or Example 2, which will not be described in detail here.

[0054] In this embodiment, the auxiliary brake control system also includes a start circuit, a flameout limiter, a data recorder, etc. The start circuit is used to receive a signal from the auxiliary brake controller to restart the engine; the flameout limiter is used to receive a signal from the auxiliary brake controller to start or close the flameout limiter; the data recorder is used to record data information during the auxiliary braking process. Furthermore, a calibration quantity is preset in the auxiliary brake control system for calculating the braking torque and deceleration.

[0055] Example 4

[0056] This embodiment provides a vehicle that uses the auxiliary braking control method described in Example 1 or Example 2 to perform auxiliary braking, or is equipped with the auxiliary braking control system described in Example 3.

[0057] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0058] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0059] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0060] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An auxiliary braking control method, characterized in that: Performed by the auxiliary brake controller, including: Obtain vehicle driving parameters and vehicle slope status; When the vehicle driving parameters meet the preset conditions and the vehicle slope is in a downhill state, it is determined that the auxiliary brake activation conditions are met, and the exhaust brake control and the engine brake control are activated; Wherein, the exhaust brake control and engine brake control include: When the engine speed and vehicle speed are within a preset range, brake torque calculation and deceleration calculation are performed, and it is determined whether exhaust braking and / or engine braking is appropriate to be activated based on the calculation results; If it is appropriate to start the exhaust brake and / or the engine brake, start the exhaust brake and / or the engine brake, and obtain the engine speed and the vehicle speed in real time; If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are requested, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination; If the engine speed and / or vehicle speed still exceeds the preset value after the cyclic judgment, the speed and / or vehicle speed over-limit alarm will be activated.

2. The auxiliary brake control method according to claim 1, characterized in that: The vehicle driving parameters include: engine speed, vehicle speed, gear status and auxiliary brake handle status.

3. The auxiliary brake control method according to claim 2, characterized in that: The vehicle driving parameters meeting the preset conditions include: the engine speed is greater than the idle speed value, the vehicle speed is greater than the auxiliary brake opening threshold, the gear is in the forward gear, and the auxiliary brake handle is in the open state.

4. The auxiliary brake control method according to claim 1, characterized in that: The exhaust brake control comprises: Determine whether the engine speed and vehicle speed are within a preset range, and if the engine speed and / or vehicle speed are not within the preset range, activate a speed and / or vehicle speed over-limit alarm; If the engine speed and vehicle speed are within the preset range, the brake torque calculation and deceleration calculation are performed, and it is determined whether it is appropriate to start the exhaust brake based on the calculation results; If it is not suitable to start the exhaust brake, an alarm will be sounded and an application will be made to exit the auxiliary brake; If it is appropriate to start the exhaust brake, start the exhaust brake and obtain the engine speed and vehicle speed in real time during the exhaust brake process; If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are requested, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination; If the engine speed and / or vehicle speed still exceeds the preset value after the cyclic judgment, the speed and / or vehicle speed over-limit alarm will be activated.

5. The auxiliary brake control method according to claim 1, characterized in that: The engine brake control includes: Determine whether the engine speed and vehicle speed are within a preset range, and if the engine speed and / or vehicle speed are not within the preset range, activate a speed and / or vehicle speed over-limit alarm; If the engine speed and vehicle speed are within the preset range, the braking torque and deceleration calculations are performed, and it is determined whether it is appropriate to start the engine brake based on the calculation results; If it is not suitable to start the engine brake, an alarm will be sounded and an application will be made to exit the auxiliary brake; If it is appropriate to start the engine brake, start the engine brake, start the flameout limit and start the flameout fuel cut-off, and obtain the engine speed and vehicle speed in real time during the engine braking process; If the engine speed and / or vehicle speed exceeds the preset value, an alarm is sounded and a main brake and upshift are requested, and then the brake torque calculation and deceleration calculation are performed again to perform a cyclic determination; If the engine speed and / or vehicle speed still exceeds the preset value after the cyclic judgment, the speed and / or vehicle speed over-limit alarm will be activated.

6. The auxiliary brake control method according to claim 5, characterized in that: The engine brake control also includes: when exiting the auxiliary brake, closing the flameout limit and closing the flameout fuel cut-off.

7. The auxiliary brake control method according to claim 6, characterized in that: The engine brake control also includes: after shutting down the flameout and cutting off the fuel, determining whether the engine speed is lower than the idle value; if the engine speed is lower than the idle value, re-issuing the start signal, controlling the engine speed to increase and restore the engine start state.

8. An auxiliary brake control system, characterized in that: include: Collection instrument, used to collect vehicle driving parameters; A slope meter, used to collect the vehicle slope status; Auxiliary brake mechanism, used for exhaust brake and engine brake; Siren, used for making an alarm; An auxiliary brake controller is connected to the data collection instrument, the incline meter, the auxiliary brake mechanism and the alarm respectively, and is used to execute the auxiliary brake control method described in any one of claims 1 to 7.

9. The auxiliary brake control system according to claim 8, characterized in that: It also includes a main brake mechanism, a starter circuit and a flameout limiter respectively connected to the auxiliary brake controller; The main brake mechanism is used to send a main brake switch state signal to the auxiliary brake controller and receive a main brake application signal from the auxiliary brake controller.

10. A vehicle, characterized in that: Auxiliary braking control is performed using the method described in any one of claims 1 to 7, or includes the auxiliary braking control system described in claim 8 or 9.

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