Engine braking method, device, equipment and readable storage medium

Abstract

The present invention provides an engine braking method, device, equipment and readable storage medium. The engine braking method includes: when detecting that the vehicle auxiliary brake is turned on, obtaining the engine speed; if the engine speed is higher than the preset speed, setting the engine braking mode to turn on the cylinder brake and turn off the exhaust brake; if the engine speed is lower than the preset speed, setting the engine braking mode to turn on the cylinder brake and exhaust brake at the same time; monitoring the engine speed, and adjusting the engine braking mode according to the engine speed. The present invention obtains the engine speed and compares the engine speed with the preset speed under the vehicle working condition with the auxiliary brake turned on, and sets the corresponding engine braking mode to make the engine have the maximum braking power, and adjusts the engine braking mode according to the real-time engine speed, so that the engine can exert the maximum braking power under different speeds.

Description

Technical Field

[0001] The present invention relates to the field of engine technology, and in particular to an engine braking method, device, equipment and a readable storage medium. Background Art

[0002] With the continuous upgrading of automobile technology, the requirements for vehicle comfort are getting higher and higher. In addition to traditional brakes, vehicles have also added engine cylinder braking and exhaust braking to improve the braking power of the engine. Among them, engine cylinder braking is a form of auxiliary braking of the whole vehicle. Its advantage is that it can not only improve the braking ability of the whole vehicle, but also reduce the braking load of the main brake of the whole vehicle. During engine cylinder braking, when the engine is close to the top dead center during the compression stroke, the exhaust valve is opened with a small lift under the drive of the engine cylinder braking device, and then the compressed high-pressure gas in the cylinder is quickly released, so that the pressure in the cylinder is rapidly reduced to reduce the energy of the power stroke. Therefore, in the subsequent power stroke, the engine basically does not work externally, thereby slowing down the engine; when the exhaust brake is turned on, the exhaust butterfly valve is closed to a certain extent (but not completely closed, and the opening will be adjusted according to the pressure in the exhaust manifold), so that the engine piston is subjected to the reverse pressure of the gas during the exhaust stroke, slowing down the running speed of the engine and producing a braking effect. Currently, when the driver turns on the auxiliary brake switch, the engine cylinder brake and exhaust brake are turned on together, and when the auxiliary brake switch is turned off, the cylinder brake and exhaust brake are turned off at the same time. However, this braking scheme cannot always exert the maximum braking power of the engine. Summary of the invention

[0003] The main purpose of the present invention is to provide an engine braking method, device, equipment and readable storage medium, aiming to solve the technical problem that when the existing auxiliary brake is turned on or off, the in-cylinder brake and the exhaust brake will be turned on or off at the same time, and the maximum braking power of the engine cannot always be exerted.

[0004] In a first aspect, the present invention provides an engine braking method, wherein the engine braking includes in-cylinder braking and exhaust braking, and the engine braking method includes:

[0005] When it is detected that the vehicle auxiliary brake is turned on, the engine speed is obtained;

[0006] If the engine speed is higher than the preset speed, the engine braking mode is set to in-cylinder braking on and exhaust braking off;

[0007] If the engine speed is lower than the preset speed, the engine braking mode is set to open the cylinder brake and exhaust brake at the same time;

[0008] Monitor the engine speed and adjust the engine braking method according to the engine speed.

[0009] Optionally, the monitoring of the engine speed and adjusting the engine braking method according to the engine speed includes:

[0010] Monitor engine speed;

[0011] When the engine speed is higher than a first preset value, the engine braking mode is set to in-cylinder braking on and exhaust braking off, and the first preset value is greater than the preset speed;

[0012] When the engine speed is lower than a second preset value, the engine braking mode is set to be simultaneously turned on with the in-cylinder brake and the exhaust brake, and the second preset value is less than the preset speed.

[0013] Optionally, after monitoring the engine speed and adjusting the engine braking method according to the engine speed, the method further includes:

[0014] Adjust the engine braking method according to the status of the accelerator pedal and the brake pedal.

[0015] Optionally, adjusting the braking mode of the engine according to the accelerator pedal state and the brake pedal state includes:

[0016] When it is detected that the accelerator pedal opening is greater than a first preset opening, and the duration of the accelerator pedal opening being greater than the first preset opening is greater than a first preset time, and the vehicle speed is continuously increasing, the engine braking mode is set to in-cylinder braking off and exhaust braking on;

[0017] When it is detected that the brake pedal opening is greater than the second preset opening, and the duration of the brake pedal opening being greater than the second preset opening is greater than the second preset time, return to the step of monitoring the engine speed and adjusting the engine braking method according to the engine speed.

[0018] Optionally, before obtaining the engine speed when the vehicle auxiliary brake is detected to be turned on, the method includes:

[0019] Based on the engine bench test, the engine braking power is calibrated at different engine speeds when the in-cylinder brake is turned on alone and when the in-cylinder brake and the engine brake are turned on simultaneously, and curve fitting is performed to obtain a first braking power curve and a second braking power curve;

[0020] The engine speed at the intersection of the first brake power curve and the second brake power curve is determined as a preset speed.

[0021] In a second aspect, the present invention further provides an engine braking device, the engine braking device comprising:

[0022] An acquisition module, used for acquiring the engine speed when it is detected that the vehicle auxiliary brake is turned on;

[0023] A first setting module is used to set the engine braking mode to in-cylinder braking on and exhaust braking off if the engine speed is higher than a preset speed;

[0024] The second setting module is used to set the engine braking mode to be simultaneously turned on with the in-cylinder brake and the exhaust brake if the engine speed is lower than a preset speed;

[0025] The regulating module is used to monitor the engine speed and adjust the engine braking method according to the engine speed.

[0026] Optionally, the adjustment module is used to:

[0027] Monitor engine speed;

[0028] When the engine speed is higher than a first preset value, the engine braking mode is set to in-cylinder braking on and exhaust braking off, and the first preset value is greater than the preset speed;

[0029] When the engine speed is lower than a second preset value, the engine braking mode is set to be simultaneously turned on with the in-cylinder brake and the exhaust brake, and the second preset value is less than the preset speed.

[0030] Optionally, the engine braking device further includes a state adjustment module, which is used to:

[0031] Adjust the engine braking method according to the status of the accelerator pedal and the brake pedal.

[0032] In a third aspect, the present invention also provides an engine braking device, comprising a processor, a memory, and an engine braking program stored in the memory and executable by the processor, wherein when the engine braking program is executed by the processor, the steps of the engine braking method described above are implemented.

[0033] In a fourth aspect, the present invention further provides a readable storage medium, on which an engine braking program is stored, wherein when the engine braking program is executed by a processor, the steps of the engine braking method as described above are implemented.

[0034] In the present invention, when it is detected that the vehicle auxiliary brake is turned on, the engine speed is obtained; if the engine speed is higher than the preset speed, the engine braking mode is set to open the cylinder brake and close the exhaust brake; if the engine speed is lower than the preset speed, the engine braking mode is set to open the cylinder brake and exhaust brake at the same time; the engine speed is monitored and the engine braking mode is adjusted according to the engine speed. The present invention obtains the engine speed and compares the engine speed with the preset speed under the vehicle working condition with the auxiliary brake turned on. When the engine speed is higher than the preset speed, the engine braking mode is set to open the cylinder brake and close the exhaust brake, so that the engine has the maximum braking power. When the engine speed is lower than the preset speed, the engine braking mode is set to open the cylinder brake and exhaust brake at the same time, so that the engine has the maximum braking power, and the engine braking mode is adjusted according to the real-time engine speed, so that the engine can exert the maximum braking power under different speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the hardware structure of an engine brake device according to an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of a flow chart of an engine braking method according to an embodiment of the present invention;

[0037] Figure 3 for Figure 2 A detailed flow chart of step S40;

[0038] Figure 4 A schematic diagram of braking power of different engine braking modes at different engine speeds according to an embodiment of an engine braking method of the present invention;

[0039] Figure 5 It is a schematic diagram of the functional modules of an engine braking device according to an embodiment of the present invention.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0042] In a first aspect, an embodiment of the present invention provides an engine braking device.

[0043] Reference Figure 1 , Figure 1This is a schematic diagram of the hardware structure of an embodiment of the engine braking device of the present invention. In the embodiment of the present invention, the engine braking device may include a processor 1001 (such as a central processing unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components; the user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a wireless interface (such as wireless fidelity WIreless-FIdelity, WI-FI interface); the memory 1005 may be a high-speed random access memory (random access memory, RAM), or a stable memory (non-volatile memory), such as a disk storage, and the memory 1005 may optionally be a storage device independent of the aforementioned processor 1001. Those skilled in the art will understand that Figure 1 The hardware structure shown in the figure does not constitute a limitation of the present invention, and may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0044] Continue to refer to Figure 1 , Figure 1 The memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and an engine braking program. The processor 1001 may call the engine braking program stored in the memory 1005 and execute the engine braking method provided in the embodiment of the present invention.

[0045] In a second aspect, an embodiment of the present invention provides an engine braking method.

[0046] In order to more clearly demonstrate the engine braking method provided in the embodiment of the present application, the application scenario of the engine braking method provided in the embodiment of the present application is first introduced.

[0047] The engine braking method provided in the embodiment of the present application is used to improve driving comfort, or in scenarios where auxiliary braking is required when the vehicle is going downhill, etc., in order to have a better vehicle braking effect, the engine's braking power is improved by increasing the engine's in-cylinder braking and exhaust braking.

[0048] In one embodiment, referring to Figure 2 , Figure 2 FIG. 1 is a flow chart of an embodiment of an engine braking method of the present invention. Figure 2 As shown, the engine braking method includes:

[0049] Step S10, when it is detected that the vehicle auxiliary brake is turned on, the engine speed is obtained.

[0050] In this embodiment, under the vehicle operating condition where the auxiliary brake is turned on, for example, the driver activates the vehicle auxiliary brake function through the vehicle auxiliary brake switch, and the current engine speed is obtained through the engine speed sensor.

[0051] Step S20: If the engine speed is higher than the preset speed, the engine braking mode is set to in-cylinder braking on and exhaust braking off.

[0052] In this embodiment, when the engine speed is higher than a preset speed, the engine braking mode is set to open the in-cylinder brake and close the exhaust brake, so that the engine can have the maximum braking power.

[0053] Step S30: If the engine speed is lower than the preset speed, the engine braking mode is set to enable both the in-cylinder braking and the exhaust braking simultaneously.

[0054] In this embodiment, when the engine speed is lower than a preset speed, the engine braking mode is set to enable the in-cylinder braking and the exhaust braking at the same time, so that the engine can have the maximum braking power.

[0055] Step S40, monitoring the engine speed, and adjusting the engine braking method according to the engine speed.

[0056] In this embodiment, the engine speed of the vehicle changes in real time under different driving conditions. The real-time engine speed is monitored, and the engine braking mode is adjusted according to the real-time engine speed obtained by monitoring. An appropriate engine braking mode is selected so that the engine can exert maximum braking power under different speed conditions.

[0057] In this embodiment, under the vehicle operating condition with the auxiliary brake turned on, the current engine speed is obtained by the engine speed sensor, and the engine speed is compared with the preset speed. When the engine speed is higher than the preset speed, the engine braking mode is set to turn on the in-cylinder brake and turn off the exhaust brake, so that the engine has the maximum braking power. When the engine speed is lower than the preset speed, the engine braking mode is set to turn on both the in-cylinder brake and the exhaust brake at the same time, so that the engine has the maximum braking power. The real-time engine speed is monitored, the engine braking mode is adjusted according to the real-time engine speed, and a suitable engine braking mode is selected so that the engine can exert the maximum braking power under different speed conditions.

[0058] Further, in one embodiment, referring to Figure 3 , Figure 3 for Figure 2The detailed flow chart of step S40 is as follows: Figure 3 As shown, step S40 includes:

[0059] Step S401, monitoring engine speed;

[0060] Step S402, when the engine speed is higher than a first preset value, setting the engine braking mode to in-cylinder braking on and exhaust braking off, the first preset value being greater than a preset speed;

[0061] Step S403, when the engine speed is lower than a second preset value, the engine braking mode is set to be simultaneously turned on with in-cylinder braking and exhaust braking, and the second preset value is less than the preset speed.

[0062] In this embodiment, the engine speed of the vehicle changes in real time under different driving conditions, and the real-time engine speed is monitored. When the real-time engine speed is higher than a first preset value, if the engine braking mode is that the cylinder brake is turned on and the exhaust brake is turned off, the engine braking mode is kept unchanged, otherwise the engine braking mode is set to be turned on and the exhaust brake is turned off. When the engine speed is lower than a second preset value, if the engine braking mode is that the cylinder brake and the exhaust brake are turned on at the same time, the engine braking mode is kept unchanged, otherwise the engine braking mode is set to be turned on at the same time. The first preset value is greater than the preset speed, and the second preset value is less than the preset speed. The interval range formed by the first preset value and the second preset value is equivalent to the hysteresis interval. The significance of setting the hysteresis interval is to avoid fluctuations in the engine speed. If the engine braking mode is frequently switched, it will cause vehicle shaking.

[0063] Furthermore, in one embodiment, after step S40, the following steps are included:

[0064] Step S50, adjusting the braking mode of the engine according to the state of the accelerator pedal and the state of the brake pedal.

[0065] In this embodiment, during the driving process of the vehicle, the changes in the accelerator pedal state and the brake pedal state are particularly involved. When the accelerator pedal state and the brake pedal state change, different engine braking power requirements will be brought about. According to the accelerator pedal state and the brake pedal state, the engine braking mode is adjusted to meet the engine braking power requirements under different accelerator pedal states and brake pedal states.

[0066] Furthermore, in one embodiment, step S50 includes:

[0067] When it is detected that the accelerator pedal opening is greater than a first preset opening, and the duration of the accelerator pedal opening being greater than the first preset opening is greater than a first preset time, and the vehicle speed is continuously increasing, the engine braking mode is set to in-cylinder braking off and exhaust braking on;

[0068] When it is detected that the brake pedal opening is greater than the second preset opening, and the duration of the brake pedal opening being greater than the second preset opening is greater than the second preset time, return to the step of monitoring the engine speed and adjusting the engine braking method according to the engine speed.

[0069] In this embodiment, when it is detected that the accelerator pedal opening is greater than a first preset opening, and the duration of the accelerator pedal opening being greater than the first preset opening is greater than a first preset time, and the vehicle speed is continuously increasing, this embodiment takes into account the possibility that the driver may accidentally touch or bump the vehicle. When it is detected that the above conditions are met, it means that the driver needs a smaller engine braking power. Since the engine braking power when the exhaust brake is turned on alone is the smallest compared with other braking methods, when it is detected that the above conditions are met, the engine braking method is set to close the in-cylinder brake and turn on the exhaust brake; in addition, when it is detected that the brake pedal opening is greater than a second preset opening, and the duration of the brake pedal opening being greater than the second preset opening is greater than the second preset time, it means that the user needs a larger engine braking power. If the engine braking method is not the maximum engine braking power at this time, it is necessary to switch the engine braking method to a braking method that can maximize the engine braking power. By returning to execute step S40, that is, monitoring the engine speed, adjusting the engine braking method according to the engine speed, the engine can exert the maximum braking power.

[0070] Furthermore, in one embodiment, before step S10, the following steps are included:

[0071] Based on the engine bench test, the engine braking power is calibrated at different engine speeds when the in-cylinder brake is turned on alone and when the in-cylinder brake and the engine brake are turned on simultaneously, and curve fitting is performed to obtain a first braking power curve and a second braking power curve;

[0072] The engine speed at the intersection of the first brake power curve and the second brake power curve is determined as a preset speed.

[0073] In this embodiment, refer to Figure 4 , Figure 4 This is a schematic diagram of the braking power of different engine braking modes at different engine speeds according to an embodiment of the engine braking method of the present invention. Figure 4The engine brake in the code means that the cylinder brake is turned on alone, the exhaust brake means that the exhaust brake is turned on alone, and the exhaust + engine brake means that both the cylinder brake and the engine brake are turned on at the same time. Figure 4 As shown, in the three engine braking modes of turning on the in-cylinder brake alone, turning on the exhaust brake alone, and turning on the in-cylinder brake and engine brake at the same time, the engine braking power of the exhaust brake is usually the smallest at different engine speeds. When the engine speed is higher than a certain value, the engine braking power of turning on the in-cylinder brake alone is greater than the engine braking power of turning on the in-cylinder brake and the engine brake at the same time. When the engine speed is lower than a certain value, the engine braking power of turning on the in-cylinder brake and the engine brake at the same time is greater than the engine braking power of turning on the in-cylinder brake alone. Therefore, by performing engine bench tests, the engine braking power of turning on the in-cylinder brake alone and turning on the in-cylinder brake and the engine brake at different engine speeds is calibrated, and curve fitting is performed to obtain a first braking power curve and a second braking power curve, and the engine speed at the intersection of the first braking power curve and the second braking power curve is determined as the preset speed for adjusting the engine braking mode.

[0074] In a third aspect, an embodiment of the present invention further provides an engine braking device.

[0075] Reference Figure 5 , Figure 5 It is a schematic diagram of the functional modules of an engine braking device according to an embodiment of the present invention.

[0076] In this embodiment, the engine braking device includes:

[0077] The acquisition module 10 is used to acquire the engine speed when it is detected that the vehicle auxiliary brake is turned on.

[0078] In this embodiment, under the vehicle operating condition where the auxiliary brake is turned on, for example, the driver activates the vehicle auxiliary brake function through the vehicle auxiliary brake switch, and the current engine speed is obtained through the engine speed sensor.

[0079] The first setting module 20 is used to set the engine braking mode to open the cylinder brake and close the exhaust brake if the engine speed is higher than a preset speed.

[0080] In this embodiment, when the engine speed is higher than a preset speed, the engine braking mode is set to open the in-cylinder brake and close the exhaust brake, so that the engine can have the maximum braking power.

[0081] The second setting module 30 is used to set the engine braking mode to start the in-cylinder braking and the exhaust braking at the same time if the engine speed is lower than a preset speed.

[0082] In this embodiment, when the engine speed is lower than a preset speed, the engine braking mode is set to enable the in-cylinder braking and the exhaust braking at the same time, so that the engine can have the maximum braking power.

[0083] The regulating module 40 is used to monitor the engine speed and adjust the engine braking mode according to the engine speed.

[0084] In this embodiment, the engine speed of the vehicle changes in real time under different driving conditions. The real-time engine speed is monitored, and the engine braking mode is adjusted according to the real-time engine speed obtained by monitoring. An appropriate engine braking mode is selected so that the engine can exert maximum braking power under different speed conditions.

[0085] Furthermore, in one embodiment, the adjustment module 40 is used to:

[0086] Monitor engine speed;

[0087] When the engine speed is higher than a first preset value, the engine braking mode is set to in-cylinder braking on and exhaust braking off, and the first preset value is greater than the preset speed;

[0088] When the engine speed is lower than a second preset value, the engine braking mode is set to be simultaneously turned on with the in-cylinder brake and the exhaust brake, and the second preset value is less than the preset speed.

[0089] In this embodiment, the engine speed of the vehicle changes in real time under different driving conditions, and the real-time engine speed is monitored. When the real-time engine speed is higher than a first preset value, if the engine braking mode is that the cylinder brake is turned on and the exhaust brake is turned off, the engine braking mode is kept unchanged, otherwise the engine braking mode is set to be turned on and the exhaust brake is turned off. When the engine speed is lower than a second preset value, if the engine braking mode is that the cylinder brake and the exhaust brake are turned on at the same time, the engine braking mode is kept unchanged, otherwise the engine braking mode is set to be turned on at the same time. The first preset value is greater than the preset speed, and the second preset value is less than the preset speed. The interval range formed by the first preset value and the second preset value is equivalent to the hysteresis interval. The significance of setting the hysteresis interval is to avoid fluctuations in the engine speed. If the engine braking mode is frequently switched, it will cause vehicle shaking.

[0090] Furthermore, in one embodiment, the engine braking device further includes a state adjustment module 50, which is used to:

[0091] Adjust the engine braking method according to the status of the accelerator pedal and the brake pedal.

[0092] In this embodiment, during the driving process of the vehicle, the changes in the accelerator pedal state and the brake pedal state are particularly involved. When the accelerator pedal state and the brake pedal state change, different engine braking power requirements will be brought about. According to the accelerator pedal state and the brake pedal state, the engine braking mode is adjusted to meet the engine braking power requirements under different accelerator pedal states and brake pedal states.

[0093] Furthermore, in one embodiment, the state adjustment module 50 is used to:

[0094] When it is detected that the accelerator pedal opening is greater than a first preset opening, and the duration of the accelerator pedal opening being greater than the first preset opening is greater than a first preset time, and the vehicle speed is continuously increasing, the engine braking mode is set to in-cylinder braking off and exhaust braking on;

[0095] When it is detected that the brake pedal opening is greater than the second preset opening, and the duration of the brake pedal opening being greater than the second preset opening is greater than the second preset time, return to the step of monitoring the engine speed and adjusting the engine braking method according to the engine speed.

[0096] In this embodiment, when it is detected that the accelerator pedal opening is greater than the first preset opening, and the duration of the accelerator pedal opening being greater than the first preset opening is greater than the first preset time, and the vehicle speed is continuously increasing, this embodiment takes into account the possibility that the driver may accidentally touch or bump the vehicle. When it is detected that the above conditions are met, it means that the driver needs a smaller engine braking power. Since the engine braking power when the exhaust brake is turned on alone is the smallest compared with other braking modes, when it is detected that the above conditions are met, the engine braking mode is set to in-cylinder braking off and exhaust braking on; in addition, when it is detected that the brake pedal opening is greater than the second preset opening, and the duration of the brake pedal opening being greater than the second preset opening is greater than the second preset time, it means that the user needs a larger engine braking power. If the engine braking mode at this time is not the maximum engine braking power, it is necessary to switch the engine braking mode to a braking mode that can maximize the engine braking power, and the engine can exert the maximum braking power by returning to execute the step of monitoring the engine speed and adjusting the engine braking mode according to the engine speed, that is, monitoring the engine speed and adjusting the engine braking mode according to the engine speed.

[0097] Furthermore, in one embodiment, the engine braking device further includes a determination module 60, which is used to:

[0098] Based on the engine bench test, the engine braking power is calibrated at different engine speeds when the in-cylinder brake is turned on alone and when the in-cylinder brake and the engine brake are turned on simultaneously, and curve fitting is performed to obtain a first braking power curve and a second braking power curve;

[0099] The engine speed at the intersection of the first brake power curve and the second brake power curve is determined as a preset speed.

[0100] In the present embodiment, among the three engine braking modes of turning on the in-cylinder brake alone, turning on the exhaust brake alone, and turning on the in-cylinder brake and the engine brake at the same time, the engine braking power of the exhaust brake is usually the smallest at different engine speeds. When the engine speed is higher than a certain value, the engine braking power of turning on the in-cylinder brake alone is greater than the engine braking power of turning on the in-cylinder brake and the engine brake at the same time. When the engine speed is lower than a certain value, the engine braking power of turning on the in-cylinder brake and the engine brake at the same time is greater than the engine braking power of turning on the in-cylinder brake alone. Therefore, by performing an engine bench test, the engine braking power of turning on the in-cylinder brake alone and turning on the in-cylinder brake and the engine brake at different engine speeds is calibrated, and curve fitting is performed to obtain a first braking power curve and a second braking power curve, and the engine speed at the intersection of the first braking power curve and the second braking power curve is determined as the preset speed for adjusting the engine braking mode.

[0101] In a fourth aspect, an embodiment of the present invention further provides a readable storage medium.

[0102] The readable storage medium of the present invention stores an engine braking program, wherein when the engine braking program is executed by a processor, the steps of the above-mentioned engine braking method are implemented.

[0103] Among them, the method implemented when the engine braking program is executed can refer to the various embodiments of the engine braking method of the present invention, and will not be repeated here.

[0104] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0105] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0106] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present invention.

[0107] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An engine braking method, characterized in that: The engine braking includes in-cylinder braking and exhaust braking, and the engine braking method includes: When it is detected that the vehicle auxiliary brake is turned on, the engine speed is obtained; If the engine speed is higher than the preset speed, the engine braking mode is set to in-cylinder braking on and exhaust braking off; If the engine speed is lower than the preset speed, the engine braking mode is set to open the cylinder brake and exhaust brake at the same time; Monitor engine speed and adjust engine braking mode according to engine speed; After monitoring the engine speed and adjusting the engine braking method according to the engine speed, the method further includes: Adjust the engine braking mode according to the accelerator pedal status and brake pedal status; The method of adjusting the engine braking mode according to the accelerator pedal state and the brake pedal state includes: When it is detected that the accelerator pedal opening is greater than a first preset opening, and the duration of the accelerator pedal opening being greater than the first preset opening is greater than a first preset time, and the vehicle speed is continuously increasing, the engine braking mode is set to in-cylinder braking off and exhaust braking on; When it is detected that the brake pedal opening is greater than the second preset opening, and the duration of the brake pedal opening being greater than the second preset opening is greater than the second preset time, return to the step of monitoring the engine speed and adjusting the engine braking method according to the engine speed.

2. The engine braking method according to claim 1, characterized in that: The method of monitoring the engine speed and adjusting the engine braking mode according to the engine speed includes: Monitor engine speed; When the engine speed is higher than a first preset value, the engine braking mode is set to in-cylinder braking on and exhaust braking off, and the first preset value is greater than the preset speed; When the engine speed is lower than a second preset value, the engine braking mode is set to be simultaneously turned on with the in-cylinder brake and the exhaust brake, and the second preset value is less than the preset speed.

3. The engine braking method according to claim 1, characterized in that: Before obtaining the engine speed when the vehicle auxiliary brake is detected to be turned on, the method includes: Based on the engine bench test, the engine braking power is calibrated at different engine speeds when the in-cylinder brake is turned on alone and when the in-cylinder brake and the engine brake are turned on simultaneously, and curve fitting is performed to obtain a first braking power curve and a second braking power curve; The engine speed at the intersection of the first brake power curve and the second brake power curve is determined as a preset speed.

4. An engine braking device, which uses the engine braking method according to any one of claims 1 to 3 for braking, characterized in that: The engine braking device comprises: An acquisition module, used for acquiring the engine speed when it is detected that the vehicle auxiliary brake is turned on; A first setting module is used to set the engine braking mode to in-cylinder braking on and exhaust braking off if the engine speed is higher than a preset speed; The second setting module is used to set the engine braking mode to be simultaneously turned on with the in-cylinder brake and the exhaust brake if the engine speed is lower than a preset speed; A regulating module, used for monitoring the engine speed and adjusting the engine braking mode according to the engine speed; The engine braking device further includes a state adjustment module for: Adjust the engine braking method according to the status of the accelerator pedal and the brake pedal.

5. The engine brake device according to claim 4, characterized in that: The regulating module is used for: Monitor engine speed; When the engine speed is higher than a first preset value, the engine braking mode is set to in-cylinder braking on and exhaust braking off, and the first preset value is greater than the preset speed; When the engine speed is lower than a second preset value, the engine braking mode is set to be simultaneously turned on with the in-cylinder brake and the exhaust brake, and the second preset value is less than the preset speed.

6. An engine braking device, characterized in that: The engine braking device comprises a processor, a memory, and an engine braking program stored in the memory and executable by the processor, wherein when the engine braking program is executed by the processor, the steps of the engine braking method according to any one of claims 1 to 3 are implemented.

7. A readable storage medium, characterized in that: The readable storage medium stores an engine braking program, wherein when the engine braking program is executed by the processor, the steps of the engine braking method according to any one of claims 1 to 3 are implemented.

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