An auxiliary brake control method, control system and vehicle

Abstract

The application discloses an auxiliary brake control method, a control system and a vehicle. The method is executed by an auxiliary brake controller and comprises the following steps: acquiring vehicle running parameters and a vehicle slope state; when the vehicle running parameters meet preset conditions and the vehicle slope state is in a downhill state, it is determined that the auxiliary brake opening conditions are met, and exhaust brake control and engine brake control are started. The application realizes auxiliary brake of a mechanical pump engine under the condition of no ECU, and ensures that the auxiliary brake function is timely, effectively and reasonably started and stopped, and the auxiliary brake function has the determination ability of main brake intervention demand, the determination ability of gear up demand and the alarm ability of engine protection exceeding the standard.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of vehicle electrical technology, and particularly relates to an auxiliary brake control method, a control system and a vehicle. BACKGROUND

[0002] The mechanical pump engine without ECU has the advantages of simplicity and reliability, simple maintenance and low requirement for oil products. However, the mechanical pump engine cannot realize many fine control functions due to the absence of ECU control. If the driver does not take braking measures and change the appropriate gear in time during long downhill road driving, the engine will be damaged due to overspeed, and the driver often uses exhaust brake (auxiliary brake) as brake, resulting in high exhaust brake damage rate and various problems.

[0003] In the prior art, functions such as fine control of brake torque of exhaust brake or engine brake, or multi-mode control of auxiliary brake are often realized for ECU engine, but there is no solution to the above problems. SUMMARY

[0004] The present application aims to overcome the deficiencies in the prior art, and provides an auxiliary brake control method, a control system and a vehicle, which can realize auxiliary brake for the mechanical pump engine under the condition of no ECU, and ensure that the auxiliary brake function is started and stopped in time, effectively and reasonably, and the auxiliary brake function has the ability to determine the need for intervention of main brake, the need for gear upshift and the need for alarm of engine protection when the engine exceeds the standard.

[0005] The present application provides the following technical solutions:

[0006] In a first aspect, an auxiliary brake control method is provided, which is executed by an auxiliary brake controller and includes the following steps:

[0007] Obtaining vehicle driving parameters and vehicle slope state;

[0008] 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 condition is met, and exhaust brake control and engine brake control are started;

[0009] The exhaust brake control and engine brake control include the following steps:

[0010] 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 it is appropriate to start exhaust brake and / or engine brake according to the calculation results;

[0011] If it is appropriate to start exhaust brake and / or engine brake, exhaust brake and / or engine brake is started, and the engine speed and vehicle speed are obtained in real time;

[0012] If the engine speed and / or the vehicle speed exceeds the preset value, an alarm is given and the main brake and upshift are applied, and then the brake torque calculation and the deceleration calculation are performed again for a cycle determination;

[0013] If the engine speed and / or the vehicle speed still exceeds the preset value after the cycle determination, the speed and / or the vehicle speed over-limit alarm is started.

[0014] Further, the vehicle driving parameters include the engine speed, the vehicle speed, the gear state and the auxiliary brake handle state.

[0015] Further, the vehicle driving parameters meeting the preset conditions include that the engine speed is greater than an idle speed value, the vehicle speed is greater than an auxiliary brake opening threshold value, the gear is in a forward gear and the auxiliary brake handle is in an open state.

[0016] Further, the exhaust brake control includes:

[0017] It is determined whether the engine speed and the vehicle speed are within a preset range, and if the engine speed and / or the vehicle speed is not within the preset range, a speed and / or vehicle speed over-limit alarm is started;

[0018] If the engine speed and the vehicle speed are within the preset range, brake torque calculation and deceleration calculation are performed, and it is determined whether it is appropriate to start the exhaust brake according to the calculation results;

[0019] If it is not appropriate to start the exhaust brake, an alarm is given and the auxiliary brake is applied to exit;

[0020] If it is appropriate to start the exhaust brake, the exhaust brake is started, and the engine speed and the vehicle speed are acquired in real time during the exhaust brake process;

[0021] If the engine speed and / or the vehicle speed exceeds the preset value, an alarm is given and the main brake and upshift are applied, and then the brake torque calculation and the deceleration calculation are performed again for a cycle determination;

[0022] If the engine speed and / or the vehicle speed still exceeds the preset value after the cycle determination, the speed and / or the vehicle speed over-limit alarm is started.

[0023] Further, the engine brake control includes:

[0024] It is determined whether the engine speed and the vehicle speed are within a preset range, and if the engine speed and / or the vehicle speed is not within the preset range, a speed and / or vehicle speed over-limit alarm is started;

[0025] If the engine speed and the vehicle speed are within the preset range, brake torque calculation and deceleration calculation are performed, and it is determined whether it is appropriate to start the engine brake according to the calculation results;

[0026] If it is not appropriate to start the engine brake, an alarm is given and the auxiliary brake is applied to exit;

[0027] If the engine brake is started, the engine brake is started, the engine cut-off limit is started, and the engine cut-off is started, and the engine speed and vehicle speed are obtained in real time during the engine brake process;

[0028] If the engine speed and / or vehicle speed exceeds the preset value, an alarm is issued and the main brake and upshift are applied, and then the brake torque calculation and deceleration calculation are performed again for cyclic determination;

[0029] If the engine speed and / or vehicle speed still exceeds the preset value after cyclic determination, an engine speed and / or vehicle speed over-limit alarm is started.

[0030] Further, the engine brake control further comprises: when the auxiliary brake is exited, the engine cut-off limit is closed, and the engine cut-off is closed.

[0031] Further, the engine brake control further comprises: after the engine cut-off is closed, it is determined whether the engine speed is lower than the idle speed value; if the engine speed is lower than the idle speed value, a start signal is reissued to control the engine speed to increase and restore the engine start state.

[0032] In a second aspect, an auxiliary brake control system is provided, comprising:

[0033] An instrument is used to collect vehicle driving parameters;

[0034] A slope meter is used to collect vehicle slope state;

[0035] An auxiliary brake mechanism is used to perform exhaust brake and engine brake;

[0036] An alarm is used for alarm;

[0037] An auxiliary brake controller is connected to the collection instrument, slope meter, auxiliary brake mechanism and alarm respectively, and is used to execute the auxiliary brake control method of the first aspect.

[0038] Further, it further comprises a main brake mechanism, a start circuit and an engine cut-off limiter connected to the auxiliary brake controller respectively;

[0039] The main brake mechanism is used to send a main brake switch state signal to the auxiliary brake controller, and receive an application main brake signal from the auxiliary brake controller.

[0040] In a third aspect, a vehicle is provided, which adopts the auxiliary brake control method of the first aspect or comprises the auxiliary brake control system of the second aspect.

[0041] Compared with the prior art, the present application has the following advantages:

[0042] (1) The auxiliary brake control method provided by the application is executed by an auxiliary brake controller, vehicle running parameters and vehicle slope state are acquired, when the vehicle running parameters meet the preset conditions and the vehicle slope state is in a downhill state, it is determined that the auxiliary brake opening condition is met, exhaust brake control and engine brake control are opened, mechanical pump engine can still perform auxiliary brake under the condition of no ECU, and the double auxiliary brake control mode of exhaust brake control and engine brake control can be realized, so the adaptation ability of different auxiliary brake functions can be improved; in addition, the vehicle slope state in the downhill state is taken as one of the auxiliary brake opening conditions, which can ensure that the auxiliary brake function is timely, effective and reasonable to open and close;

[0043] (2) When the exhaust brake control and the engine brake control are performed, the brake torque calculation and the deceleration calculation are performed when the engine speed and the vehicle speed are in the preset range, and whether it is appropriate to start the exhaust brake and / or the engine brake is determined according to the calculation result, so that the auxiliary brake is opened in time, and the vehicle damage and safety problems caused by not opening the auxiliary function in time are avoided;

[0044] (3) When the exhaust brake control and the engine brake control are performed, the engine speed and the vehicle speed are acquired in real time, if the engine speed and / or the vehicle speed exceeds the preset value, an alarm is given and the main brake and the upshift are applied, so that the determination ability of the main brake intervention demand and the determination ability of the upshift demand are possessed, the engine is protected by reminding the driver to take correct measures in time and effectively, vehicle failure is avoided and the vehicle speed is effectively limited, and the alarm ability of the over-standard engine protection is also possessed. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a flowchart for determining the auxiliary brake opening condition in the embodiment of the application;

[0046] Figure 2 is a flowchart for exhaust brake control in the embodiment of the application;

[0047] Figure 3 is a flowchart for engine brake control in the embodiment of the application;

[0048] Figure 4 is a principle topology diagram of the auxiliary brake control system in the embodiment of the application. DETAILED DESCRIPTION

[0049] The application will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application.

[0050] The term "and / or", only describes the association relation of the associated objects, which means that there can be three relations, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " generally represents an "or" relationship between the associated objects before and after it.

[0051] Embodiment 1

[0052] The embodiment provides an auxiliary brake control method, which is executed by an auxiliary brake controller, and steps are as follows:

[0053] Step 1, obtaining vehicle running parameters and vehicle slope state.

[0054] Step 2, when the vehicle running parameters meet the preset conditions and the vehicle slope state is in the downhill state, it is determined that the auxiliary brake opening condition is met, and the exhaust brake control and the engine brake control are started.

[0055] The exhaust brake control and the engine brake control comprise:

[0056] When the engine speed and the vehicle speed are in the preset range, the brake torque calculation and the deceleration calculation are performed, and whether it is appropriate to start the exhaust brake and / or the engine brake is determined according to the calculation result;

[0057] If it is appropriate to start the exhaust brake and / or the engine brake, the exhaust brake and / or the engine brake are started, and the engine speed and the vehicle speed are obtained in real time;

[0058] If the engine speed and / or the vehicle speed exceeds the preset value, an alarm is given and the main brake and the gear up are applied, and then the brake torque calculation and the deceleration calculation are performed again to perform a cycle determination;

[0059] If the engine speed and / or the vehicle speed still exceeds the preset value after the cycle determination, an engine speed and / or vehicle speed over-limit alarm is started.

[0060] Embodiment 2

[0061] The embodiment provides an auxiliary brake control method, which is executed by an auxiliary brake controller, and steps are as follows:

[0062] Step 1, obtaining vehicle running parameters and vehicle slope state.

[0063] The vehicle running parameters comprise an engine speed, a vehicle speed, a gear state and an auxiliary brake handle state.

[0064] Step 2, as Figure 1As shown, when the vehicle running parameter meets the preset condition, and the vehicle slope state is in the downhill state, it is determined that the auxiliary braking opening condition is met, and the exhaust brake control and engine brake control are opened; if the vehicle slope state is not suitable for braking, an alarm is given to remind the driver to perform main braking.

[0065] The vehicle running parameter meeting the preset condition includes:

[0066] (1) The engine speed is greater than the idle speed value, i.e. the engine is in a normal operating state;

[0067] (2) The vehicle speed is greater than the auxiliary braking opening threshold value, which can be confirmed by experimental test calibration to ensure that the auxiliary braking can obtain ideal braking torque, and when the value is lower, the auxiliary braking effect will decrease sharply and no longer have significant auxiliary braking effect;

[0068] (3) The gear is in the forward gear, when the vehicle gear is in the neutral gear or the reverse gear mode, the engine and the vehicle resistance load are disconnected, and the auxiliary braking force cannot be effectively transmitted to achieve the purpose of reducing the vehicle speed;

[0069] (4) The auxiliary braking handle is in the open state.

[0070] Further, taking the vehicle slope state in the downhill state as one of the auxiliary braking opening conditions can ensure that the auxiliary braking function is timely, effective and reasonable.

[0071] As shown in Figure 2 , the exhaust brake control method steps are as follows:

[0072] Step 2.1.1, determine whether the engine speed and vehicle speed are in the preset range, if the engine speed and / or vehicle speed are not in the preset range, start the speed and / or speed overrun alarm.

[0073] Step 2.1.2, if the engine speed and vehicle speed are in the preset range, calculate the braking torque and deceleration, and determine whether it is appropriate to start the exhaust brake according to the calculation result.

[0074] The calibration table obtained by experimental test can obtain the brake torque value range under the engine speed and vehicle speed and determine the appropriate timing of starting auxiliary braking. Specifically, through engine bench test calibration, the brake torque value obtained by corresponding auxiliary braking under different engine speeds is obtained, for example, the longitudinal direction of the table is the engine speed, and the lateral direction is the auxiliary brake torque value measured under the corresponding speed, thereby forming a calibration table. Further, through the parameter calculation of the vehicle speed ratio, the transmission speed ratio under the corresponding vehicle speed and engine speed can be calculated, and the drive axle speed ratio can be obtained, so that another parameter table, i.e., the corresponding relationship table of engine speed under a certain gear and vehicle speed, can be calculated. Under the premise of pre-setting a certain reasonable and available auxiliary brake torque value range, by querying the above two tables, it can be known whether the auxiliary brake torque under the corresponding engine speed and vehicle speed meets the opening condition, i.e., whether the auxiliary brake torque is large enough to be worth opening the function. If the auxiliary brake torque value is too small, it is unnecessary to open the function. If the vehicle speed is too high and the engine speed is too high, the auxiliary brake torque value is too large, and if it is opened, it is easy to damage the auxiliary brake system and the engine system, and it also needs to be avoided and prohibited to open.

[0075] By the auxiliary brake torque under the corresponding engine speed and vehicle speed and the vehicle power chain transmission speed ratio, the theoretical brake torque acting on the wheel can be calculated, and the required deceleration value (i.e., negative acceleration) can be obtained according to the acceleration calculation formula. By determining the change trend of the vehicle deceleration, it can be determined whether the engine speed and vehicle speed will be out of control after a certain time, and the corresponding alarm value can be provided in time.

[0076] Step 2.1.3, if it is not appropriate to start exhaust braking, an alarm is given and the auxiliary braking is applied to exit.

[0077] Step 2.1.4, if it is appropriate to start exhaust braking, exhaust braking is started, and the engine speed and vehicle speed are obtained in real time during the exhaust braking process.

[0078] Step 2.1.5, if the engine speed and / or vehicle speed exceeds the preset value or has a trend of exceeding the preset value, an alarm is given and the main brake and upshift are applied, and then the brake torque calculation and deceleration calculation are performed again to perform a cycle determination.

[0079] Through the determination of the main brake intervention requirement and the determination of the upshift requirement, it is ensured that the driver is reminded to take correct measures in time and effectively to protect the engine, avoid vehicle failure and effectively limit the vehicle speed, and also has the alarm capability of exceeding the engine protection standard.

[0080] Step 2.1.6, if the engine speed and / or vehicle speed still exceeds the preset value after the cycle determination, a speed and / or vehicle speed over-limit alarm is started.

[0081] As Figure 3 shown in the figure, the engine brake control method steps as follows:

[0082] Step 2.2.1, determine whether the engine speed and vehicle speed are in the preset range, if the engine speed and / or vehicle speed is not in the preset range, start the speed and / or speed overrun alarm.

[0083] Step 2.2.2, if the engine speed and vehicle speed are in the preset range, calculate the brake torque and deceleration, and determine whether it is appropriate to start the engine brake according to the calculation result.

[0084] Wherein, the brake torque calculation and deceleration calculation method is the same as step 2.1.2.

[0085] Step 2.2.3, if it is not appropriate to start the engine brake, alarm and apply to exit the auxiliary brake. When exiting the auxiliary brake, close the flameout limit, close the flameout oil to restore normal oil supply; then determine whether the engine speed is lower than the idle value; if the engine speed is lower than the idle value, reissue the start signal, control the engine speed to increase and restore the engine start state.

[0086] Step 2.2.4, if it is appropriate to start the engine brake, start the engine brake, and start the flameout limit to ensure that the flameout valve is in the working state, start the flameout oil, maintain the minimum oil supply state, and maintain the engine continuous operation under the inertia of the vehicle downhill; in addition, the engine speed and vehicle speed are obtained in real time during the engine brake process.

[0087] Step 2.2.5, if the engine speed and / or vehicle speed exceeds the preset value, alarm and apply the main brake and upshift, then calculate the brake torque and deceleration again for cyclic determination.

[0088] Step 2.2.6, if the engine speed and / or vehicle speed still exceeds the preset value after cyclic determination, start the speed and / or speed overrun alarm.

[0089] The auxiliary brake control method provided by the application is executed by the auxiliary brake controller, by obtaining the vehicle running parameters and the vehicle slope state, when the vehicle running parameters meet the preset conditions and the vehicle slope state is in the downhill state, it is determined that the auxiliary brake opening condition is met, the exhaust brake control and the engine brake control are opened, the mechanical pump engine can still perform auxiliary brake under the condition of no ECU, and the double auxiliary brake control mode of exhaust brake control and engine brake control can be realized, so the adaptation ability of different auxiliary brake functions can be improved; in addition, the vehicle slope state in the downhill state is used as one of the auxiliary brake opening conditions, which can ensure that the auxiliary brake function is timely, effective and reasonable.

[0090] Example 3

[0091] like Figure 4 As shown, this embodiment provides an auxiliary braking control system, including an auxiliary braking controller and a data acquisition instrument, an inclinometer, an auxiliary braking mechanism, a main braking mechanism, and an alarm, all connected to the auxiliary braking controller.

[0092] The data acquisition instrument is used to collect vehicle driving parameters and send the parameter information to the auxiliary braking controller. Specifically, the data acquisition instrument includes a vehicle speed sensor for measuring vehicle speed and a speed sensor for measuring engine speed. The data acquisition instrument also collects information on the vehicle's gear status.

[0093] A slope meter is used to collect information about a vehicle's slope and send this information to the auxiliary braking controller. The slope meter can measure the road gradient or the vehicle's tilt angle to determine the vehicle's slope status, such as whether it is going uphill, downhill, or on a flat road.

[0094] The auxiliary braking mechanism, including an exhaust brake valve, an in-cylinder brake valve, an engine shutdown control valve, and an auxiliary brake handle, is used to send an auxiliary brake switch (such as an auxiliary brake handle) status signal to the auxiliary brake controller and receive an activation signal for the auxiliary brake from the auxiliary brake controller to perform exhaust braking and engine braking.

[0095] The main braking mechanism is used to send the main braking switch status signal to the auxiliary braking controller and receive the main braking request signal from the auxiliary braking controller so that the driver can perform active braking.

[0096] Alarms, such as buzzers, are used to receive signals from the auxiliary brake controller to issue an alarm.

[0097] An auxiliary braking controller is used to execute the auxiliary braking control method described in Embodiment 1 or Embodiment 2, which will not be described in detail here.

[0098] In this embodiment, the auxiliary braking control system also includes a start-up circuit, an engine shutdown limiter, and a data logger; the start-up circuit is used to receive signals from the auxiliary braking controller to restart the engine; the engine shutdown limiter is used to receive signals from the auxiliary braking controller to activate or deactivate the engine shutdown limiter; and the data logger is used to record data information during the auxiliary braking process. Furthermore, the auxiliary braking control system also includes preset calibration values ​​for calculating braking torque and deceleration.

[0099] Example 4

[0100] This embodiment provides a vehicle that uses the auxiliary braking control method described in Embodiment 1 or Embodiment 2 for auxiliary braking, or is equipped with the auxiliary braking control system described in Embodiment 3.

[0101] Those skilled in the art will appreciate that embodiments of the present application can be readily used as software, hardware, or a combination of software and hardware. In a software embodiment, the methods can be tangibly embodied in a machine-readable storage medium having stored thereon instructions that can be used to program a processing system to perform the methods. The machine-readable storage medium can be magnetic

[0102] The present application is described in reference to the drawings, which are as follows. Figure 1 Each flow or multiple flows and / or blocks Figure 1 Means for carrying out the function specified by the flow or flows and / or block or blocks.

[0103] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flow Figure 1 Each flow or multiple flows and / or blocks Figure 1 Means for carrying out the function specified by the flow or flows and / or block or blocks.

[0104] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 Each flow or multiple flows and / or blocks Figure 1 Means for carrying out the function specified by the flow or flows and / or block or blocks.

[0105] The above description is only preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. An auxiliary braking control method, characterized in that, Performed by the auxiliary braking controller, including: Obtain vehicle driving parameters and vehicle slope status; When the vehicle's driving parameters meet the preset conditions and the vehicle's slope is in a downhill state, it is determined that the conditions for activating auxiliary braking are met, and exhaust braking control and / or engine braking control are activated. Wherein, the exhaust braking control and / or engine braking control includes: When the engine speed and vehicle speed are within the preset range, braking torque and deceleration are calculated, and the appropriateness to start exhaust braking and / or engine braking is determined based on the calculation results. If it is appropriate to activate exhaust braking and / or engine braking, then activate exhaust braking and / or engine braking, and obtain engine speed and vehicle speed in real time; If the engine speed and / or vehicle speed exceed the preset value, an alarm will be triggered and the main brake and upshift will be requested. Then, the braking torque and deceleration will be calculated again for cyclic judgment. If, after repeated checks, the engine speed and / or vehicle speed still exceed the preset values, an over-limit alarm for engine speed and / or vehicle speed will be activated.

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

3. The auxiliary braking control method according to claim 2, characterized in that, The vehicle driving parameters meet the preset conditions, including: engine speed is greater than idle speed, vehicle speed is greater than auxiliary braking activation threshold, gear is in forward gear, and auxiliary braking lever is in the open state.

4. The auxiliary braking control method according to claim 1, characterized in that, The exhaust braking control includes: Determine whether the engine speed and vehicle speed are within the preset range. If the engine speed and / or vehicle speed are not within the preset range, activate the speed and / or vehicle speed over-limit alarm. If the engine speed and vehicle speed are within the preset range, braking torque and deceleration calculations are performed, and it is determined whether it is appropriate to start the exhaust brake based on the calculation results. If it is not appropriate to activate the exhaust brake, an alarm will be triggered and a request to disengage the auxiliary brake will be made. If it is appropriate to initiate exhaust braking, then initiate exhaust braking and obtain engine speed and vehicle speed in real time during exhaust braking. If the engine speed and / or vehicle speed exceed the preset value, an alarm will be triggered and the main brake and upshift will be requested. Then, the braking torque and deceleration will be calculated again for cyclic judgment. If, after repeated checks, the engine speed and / or vehicle speed still exceed the preset values, an over-limit alarm for engine speed and / or vehicle speed will be activated.

5. The auxiliary braking control method according to claim 1, characterized in that, The engine braking control includes: Determine whether the engine speed and vehicle speed are within the preset range. If the engine speed and / or vehicle speed are not within the preset range, activate the speed and / or vehicle speed over-limit alarm. If the engine speed and vehicle speed are within the preset range, braking torque and deceleration calculations are performed, and it is determined whether it is appropriate to start engine braking based on the calculation results. If it is not appropriate to start engine braking, an alarm will be triggered and a request to disengage auxiliary braking will be made; If it is appropriate to start engine braking, then start engine braking, and activate the engine shutdown limit switch and engine shutdown fuel cut-off, and obtain engine speed and vehicle speed in real time during engine braking; If the engine speed and / or vehicle speed exceed the preset value, an alarm will be triggered and the main brake and upshift will be requested. Then, the braking torque and deceleration will be calculated again for cyclic judgment. If, after repeated checks, the engine speed and / or vehicle speed still exceed the preset values, an over-limit alarm for engine speed and / or vehicle speed will be activated.

6. The auxiliary braking control method according to claim 5, characterized in that, The engine braking control also includes: closing the engine shutdown limit switch and closing the engine shutdown fuel cut-off when the auxiliary braking is disengaged.

7. The auxiliary braking control method according to claim 6, characterized in that, The engine braking control also includes: after shutting off the fuel supply, determining whether the engine speed is lower than the idle speed; if the engine speed is lower than the idle speed, then issuing a restart signal to control the engine speed to increase and restore the engine to the starting state.

8. An auxiliary braking control system, characterized in that, include: Data acquisition instruments are used to collect vehicle driving parameters; Inclinometer, used to collect vehicle slope information; Auxiliary braking mechanism for exhaust braking and / or engine braking; An alarm is used to sound an alarm. An auxiliary braking controller is connected to the data acquisition instrument, inclinometer, auxiliary braking mechanism, and alarm, respectively, and is used to execute the auxiliary braking control method according to any one of claims 1 to 7.

9. The auxiliary braking control system according to claim 8, characterized in that, It also includes a main braking mechanism, a starting circuit, and a shutdown limit switch, which are respectively connected to the auxiliary braking controller; The main braking mechanism is used to send a main braking switch status signal to the auxiliary braking controller and to receive a request for main braking signal from the auxiliary braking controller.

10. A vehicle, characterized in that, The 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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