CN115653764A - Engine braking method, device, equipment and readable storage medium - Google Patents
Engine braking method, device, equipment and readable storage medium Download PDFInfo
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Abstract
The invention provides an engine braking method, an engine braking device, engine braking equipment and a readable storage medium, wherein the engine braking method comprises the following steps: when the auxiliary brake of the vehicle is detected to be turned on, the rotating speed of the engine is obtained; if the rotating speed of the engine is higher than the preset rotating speed, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off; if the rotating speed of the engine is lower than the preset rotating speed, setting the braking mode of the engine as that the in-cylinder braking and the exhaust braking are simultaneously started; the engine speed is monitored and the braking mode of the engine is adjusted according to the engine speed. According to the invention, under the working condition of the vehicle with the auxiliary brake on, the rotating speed of the engine is acquired and compared with the preset rotating speed, the engine has the maximum braking power by setting the corresponding engine braking mode, and the braking mode of the engine is adjusted according to the real-time rotating speed of the engine, so that the engine can exert the maximum braking power under the conditions of different rotating speeds.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an engine braking method, device and equipment and a readable storage medium.
Background
With the continuous upgrading of automobile technology, the requirement on the comfort of the vehicle is higher and higher, the vehicle increases the in-cylinder brake and the exhaust brake of an engine to improve the brake power of the engine besides the traditional brake, wherein the in-cylinder brake of the engine is a form of auxiliary brake of the whole vehicle, and the engine brake has the advantages of improving the brake capacity of the whole vehicle and reducing the brake load of the main brake of the whole vehicle; when the exhaust brake is opened, the exhaust butterfly valve is closed to a certain extent (but cannot be completely closed, and the opening degree can be adjusted according to the pressure in the exhaust manifold), so that when the engine piston is in an exhaust stroke, the engine piston is subjected to the reverse pressure of gas, the running speed of the engine is slowed down, and the brake effect is generated. At present, when a driver turns on an auxiliary brake switch, the in-cylinder brake and the exhaust brake of the engine are turned on together, the auxiliary brake switch is turned off, and the in-cylinder brake and the exhaust brake are simultaneously turned off, however, the brake scheme is not always capable of exerting the maximum braking power of the engine.
Disclosure of Invention
The invention mainly aims to provide an engine braking method, an engine braking device, engine braking equipment and a readable storage medium, and aims to solve the technical problem that when the conventional auxiliary brake is turned on or off, the in-cylinder brake and the exhaust brake are turned on or off at the same time, and the maximum braking power of an engine cannot be exerted all the time.
In a first aspect, the present invention provides an engine braking method including in-cylinder braking and exhaust braking, the engine braking method comprising:
when the auxiliary brake of the vehicle is detected to be turned on, the rotating speed of the engine is obtained;
if the rotating speed of the engine is higher than the preset rotating speed, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off;
if the rotating speed of the engine is lower than the preset rotating speed, setting the braking mode of the engine to be that the in-cylinder braking and the exhaust braking are simultaneously started;
the engine speed is monitored and the braking mode of the engine is adjusted according to the engine speed.
Optionally, the monitoring the engine speed and adjusting the engine braking mode according to the engine speed includes:
monitoring the engine speed;
when the rotating speed of the engine is higher than a first preset value, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off, wherein the first preset value is larger than the preset rotating speed;
and when the rotating speed of the engine is lower than a second preset value, setting the braking mode of the engine to be that the in-cylinder braking and the exhaust braking are simultaneously started, wherein the second preset value is lower than the preset rotating speed.
Optionally, after the monitoring the engine speed and adjusting the braking mode of the engine according to the engine speed, the method includes:
and adjusting the braking mode of the engine according to the states of the accelerator pedal and the brake pedal.
Optionally, the adjusting the braking mode of the engine according to the accelerator pedal state and the brake pedal state includes:
when the opening degree of an accelerator pedal is detected to be larger than a first preset opening degree, the duration time that the opening degree of the accelerator pedal is larger than the first preset opening degree is detected to be larger than first preset time, and the vehicle speed is continuously increased, the braking mode of the engine is set to be that in-cylinder braking is closed, and exhaust braking is opened;
and returning to the step of monitoring the rotating speed of the engine and adjusting the braking mode of the engine according to the rotating speed of the engine when the opening degree of the brake pedal is detected to be larger than the second preset opening degree and the duration of the opening degree of the brake pedal larger than the second preset opening degree is detected to be larger than the second preset time.
Optionally, before obtaining the engine speed when the vehicle auxiliary brake is detected to be on, the method includes:
based on engine bench test, separately starting in-cylinder braking and simultaneously starting in-cylinder braking and engine braking, calibrating engine braking power at different engine speeds, and performing curve fitting to obtain a first braking power curve and a second braking power curve;
and determining the engine speed at the intersection point of the first brake power curve and the second brake power curve as a preset speed.
In a second aspect, the present invention also provides an engine brake device comprising:
the acquisition module is used for acquiring the rotating speed of the engine when the opening of the auxiliary brake of the vehicle is detected;
the first setting module is used for setting the braking mode of the engine to be that the in-cylinder braking is started and the exhaust braking is closed if the rotating speed of the engine is higher than a preset rotating speed;
the second setting module is used for setting the braking mode of the engine to be that the in-cylinder braking and the exhaust braking are simultaneously started if the rotating speed of the engine is lower than the preset rotating speed;
and the adjusting module is used for monitoring the rotating speed of the engine and adjusting the braking mode of the engine according to the rotating speed of the engine.
Optionally, the adjusting module is configured to:
monitoring the engine speed;
when the rotating speed of the engine is higher than a first preset value, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off, wherein the first preset value is larger than the preset rotating speed;
and when the rotating speed of the engine is lower than a second preset value, setting the braking mode of the engine to be that in-cylinder braking and exhaust braking are simultaneously started, wherein the second preset value is lower than the preset rotating speed.
Optionally, the engine braking device further comprises a state adjusting module, configured to:
and adjusting the braking mode of the engine according to the states of the accelerator pedal and the brake pedal.
In a third aspect, the invention also provides an engine braking apparatus comprising a processor, a memory, and an engine braking program stored on the memory and executable by the processor, wherein the engine braking program, when executed by the processor, implements the steps of the engine braking method as described above.
In a fourth aspect, the present invention further provides a readable storage medium having an engine braking program stored thereon, wherein the engine braking program, when executed by a processor, implements the steps of the engine braking method as described above.
According to the invention, when the auxiliary brake of the vehicle is detected to be turned on, the rotating speed of the engine is obtained; if the rotating speed of the engine is higher than the preset rotating speed, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off; if the rotating speed of the engine is lower than the preset rotating speed, setting the braking mode of the engine as that the in-cylinder braking and the exhaust braking are simultaneously started; the engine speed is monitored and the braking mode of the engine is adjusted according to the engine speed. According to the invention, under the vehicle working condition that the auxiliary brake is on, the rotating speed of the engine is obtained and compared with the preset rotating speed, when the rotating speed of the engine is higher than the preset rotating speed, the braking mode of the engine is set to be in-cylinder braking on, the exhaust braking is off, so that the engine has the maximum braking power, when the rotating speed of the engine is lower than the preset rotating speed, the braking mode of the engine is set to be in-cylinder braking and exhaust braking simultaneously on, so that the engine has the maximum braking power, and the braking mode of the engine is adjusted according to the real-time rotating speed of the engine, so that the engine can exert the maximum braking power under the conditions of different rotating speeds.
Drawings
FIG. 1 is a schematic diagram of the hardware configuration of an embodiment of the engine braking apparatus of the present invention;
FIG. 2 is a schematic flow chart diagram of an embodiment of an engine braking method of the present invention;
FIG. 3 is a detailed flowchart of step S40 in FIG. 2;
FIG. 4 is a schematic illustration of braking power at different engine speeds for different engine braking modes in accordance with one embodiment of the engine braking method of the present invention;
fig. 5 is a functional block diagram of an embodiment of the engine braking apparatus of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a first aspect, an embodiment of the present invention provides an engine braking apparatus.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of an embodiment of the engine braking apparatus of the present invention. In an embodiment of the present invention, the engine braking device may include a processor 1001 (e.g., a Central Processing Unit (CPU)), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for realizing connection communication among the 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 (e.g., a WI-FI interface, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to FIG. 1, the memory 1005 of FIG. 1, which is one type of 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 an engine braking program stored in the memory 1005, and execute the engine braking method provided by the embodiment of the present invention.
In a second aspect, embodiments of the present invention provide an engine braking method.
In order to more clearly show the engine braking method provided by the embodiment of the present application, an application scenario of the engine braking method provided by the embodiment of the present application is first described.
The engine braking method provided by the embodiment of the application is applied to the scenes that the driving comfort is better, or the auxiliary braking is needed when the vehicle descends a slope and the like, and the braking power of the engine is improved by increasing the in-cylinder braking and the exhaust braking of the engine in order to have a better vehicle braking effect.
In one embodiment, referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of an engine braking method according to the present invention, as shown in fig. 2, the engine braking method includes:
and step S10, when the opening of the auxiliary brake of the vehicle is detected, acquiring the rotating speed of the engine.
In the embodiment, under the vehicle working condition that 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.
And step S20, if the rotating speed of the engine is higher than the preset rotating speed, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off.
In this embodiment, when the engine speed is higher than the preset speed, the braking mode of the engine is set to the in-cylinder braking on, and the exhaust braking is off, so that the engine has the maximum braking power.
And step S30, if the rotating speed of the engine is lower than the preset rotating speed, setting the braking mode of the engine to be that the in-cylinder braking and the exhaust braking are simultaneously started.
In this embodiment, when the engine speed is lower than the preset speed, the braking mode of the engine is set to be that the in-cylinder braking and the exhaust braking are simultaneously on, so that the engine can have the maximum braking power.
And step S40, monitoring the rotating speed of the engine, and adjusting the braking mode of the engine according to the rotating speed of the engine.
In this embodiment, the vehicle is under different operating modes, and the engine speed changes in real time, monitors the real-time rotational speed of engine, adjusts the braking mode of engine according to the real-time rotational speed of the engine that the monitoring obtained, selects suitable engine braking mode for the engine can both exert maximum braking power under the rotational speed circumstances of difference.
In this embodiment, under the vehicle operating mode that the auxiliary brake is turned on, obtain current engine speed through engine speed sensor, and compare engine speed and preset rotational speed, when engine speed is higher than preset rotational speed, through setting the braking mode of engine to the in-cylinder brake is opened, exhaust brake is closed, make the engine have maximum braking power, when engine speed is less than preset rotational speed, through setting the braking mode of engine to the in-cylinder brake and exhaust brake are opened simultaneously, make the engine have maximum braking power, and monitor the real-time rotational speed of engine, adjust the braking mode of engine according to the real-time rotational speed of engine, select suitable engine braking mode, make the engine under the different rotational speed circumstances, can all exert maximum braking power.
Further, in an embodiment, referring to fig. 3, fig. 3 is a detailed flowchart of step S40 in fig. 2, and as shown in fig. 3, step S40 includes:
step S401, monitoring the rotating speed of an engine;
step S402, when the rotating speed of the engine is higher than a first preset value, setting the braking mode of the engine to be that in-cylinder braking is started and exhaust braking is closed, wherein the first preset value is larger than the preset rotating speed;
and S403, when the rotating speed of the engine is lower than a second preset value, setting the braking mode of the engine to be that in-cylinder braking and exhaust braking are simultaneously started, wherein the second preset value is smaller than the preset rotating speed.
In this embodiment, the engine rotation speed changes in real time under different driving conditions of the vehicle, the real-time rotation speed of the engine is monitored, when the real-time rotation speed of the engine is higher than a first preset value, if the engine braking mode is in an in-cylinder brake on state and an exhaust brake off state, the engine braking mode is kept unchanged, otherwise, the engine braking mode is set to be in an in-cylinder brake on state and an exhaust brake off state, when the engine rotation speed is lower than a second preset value, if the engine braking mode is in an in-cylinder brake and exhaust brake on state simultaneously, the engine braking mode is kept unchanged, otherwise, the engine braking mode is set to be in an in-cylinder brake and exhaust brake on state simultaneously, wherein the first preset value is larger than the preset rotation speed, the second preset value is smaller than the preset rotation speed, and an interval range formed by the first preset value and the second preset value is equivalent to a hysteresis interval, and the significance of setting the hysteresis interval is that fluctuation of the engine rotation speed can be avoided, and if the engine braking mode is frequently switched, the vehicle will be caused by shaking.
Further, in an embodiment, after step S40, the method includes:
and S50, adjusting the braking mode of the engine according to the states of the accelerator pedal and the brake pedal.
In this embodiment, in the driving process of the vehicle, especially, the change of the accelerator pedal state and the brake pedal state is more involved, different engine braking power requirements can be brought when the accelerator pedal state and the brake pedal state are changed, and the engine braking mode is adjusted according to the accelerator pedal state and the brake pedal state so as to meet the engine braking power requirements in different accelerator pedal states and different brake pedal states.
Further, in an embodiment, the step S50 includes:
when the opening degree of an accelerator pedal is detected to be larger than a first preset opening degree, the duration time that the opening degree of the accelerator pedal is larger than the first preset opening degree is detected to be larger than first preset time, and the vehicle speed is continuously increased, the braking mode of the engine is set to be that in-cylinder braking is closed, and exhaust braking is opened;
and returning to the step of monitoring the rotating speed of the engine and adjusting the braking mode of the engine according to the rotating speed of the engine when the opening degree of the brake pedal is detected to be larger than the second preset opening degree and the duration of the opening degree of the brake pedal larger than the second preset opening degree is detected to be larger than the second preset time.
In the embodiment, when the opening degree of the accelerator pedal is detected to be larger than a first preset opening degree, the duration time that the opening degree of the accelerator pedal is larger than the first preset opening degree is detected to be larger than first preset time, and the vehicle speed is continuously increased, the situation that a driver touches the accelerator pedal by mistake is considered in the embodiment, when the conditions are detected to be met, the driver needs smaller engine braking power, and the braking power of the engine is the minimum compared with other braking modes when the exhaust brake is singly started, so when the conditions are detected to be met, the braking mode of the engine is set to be in-cylinder brake closing and exhaust brake opening; in addition, when it is detected that the opening degree of the brake pedal is greater than the second preset opening degree and the duration of the opening degree of the brake pedal being greater than the second preset opening degree is greater than the second preset time, it represents that the user needs greater engine braking power, and if the braking mode of the engine is not the maximum engine braking power at this time, the braking mode of the engine needs to be switched to the braking mode capable of maximizing the engine braking power, and the engine is enabled to exert the maximum braking power by returning to step S40, i.e., monitoring the engine speed and adjusting the braking mode of the engine according to the engine speed.
Further, in an embodiment, before step S10, the method includes:
based on engine bench testing, separately starting in-cylinder braking and simultaneously starting in-cylinder braking and engine braking, calibrating the engine braking power at different engine speeds, and performing curve fitting to obtain a first braking power curve and a second braking power curve;
and determining the engine speed of the intersection point of the first braking power curve and the second braking power curve as a preset speed.
In this embodiment, referring to fig. 4, fig. 4 is a schematic diagram of braking power of different engine braking modes at different engine speeds according to an embodiment of the engine braking method of the present invention, where the engine braking in fig. 4 represents that the in-cylinder braking is turned on individually, the exhaust braking represents that the exhaust braking is turned on individually, and the exhaust + engine braking represents that the in-cylinder braking and the engine braking are turned on simultaneously, as shown in fig. 4, in the braking modes of three engines, that is, the in-cylinder braking is turned on individually, the exhaust braking is turned on individually, and the in-cylinder braking and the engine braking are turned on simultaneously, the engine braking power of the exhaust braking is generally the smallest at different engine speeds, when the engine speed is higher than a certain value, the in-cylinder braking is turned on individually and the in-cylinder braking is greater than the engine braking power of the in-cylinder braking and the engine braking is turned on individually, and when the engine speed is lower than a certain value, the in-cylinder braking and the engine braking is greater than the engine braking power of the in-cylinder braking is turned on individually, and therefore, by performing engine bench tests, the first and second braking curves are fitted to determine the braking curves as the preset braking power curves for the engine speed.
In a third aspect, an embodiment of the present invention further provides an engine braking apparatus.
Referring to fig. 5, fig. 5 is a functional block diagram of an embodiment of the engine braking device of the present invention.
In this embodiment, the engine braking device includes:
the method comprises an obtaining module 10 for obtaining an engine speed when it is detected that a vehicle auxiliary brake is turned on.
In this embodiment, under a vehicle operating condition that the auxiliary brake is turned on, for example, a driver activates the vehicle auxiliary brake function through the vehicle auxiliary brake switch, and obtains the current engine speed through the engine speed sensor.
The first setting module 20 is configured to set a braking mode of the engine to an in-cylinder braking on and an exhaust braking off if the engine speed is higher than a preset speed.
In this embodiment, when the engine speed is higher than the preset speed, the braking mode of the engine is set to the in-cylinder braking on, and the exhaust braking is off, so that the engine has the maximum braking power.
A second setting module 30 for setting the braking mode of the engine to be in-cylinder braking and exhaust braking simultaneously on if the engine speed is lower than a preset speed.
In this embodiment, when the engine speed is lower than the preset speed, the braking mode of the engine is set to be that the in-cylinder braking and the exhaust braking are simultaneously on, so that the engine can have the maximum braking power.
And the adjusting module 40 is used for monitoring the rotating speed of the engine and adjusting the braking mode of the engine according to the rotating speed of the engine.
In the embodiment, the engine rotating speed is changed in real time under different running conditions of the vehicle, the real-time rotating speed of the engine is monitored, the braking mode of the engine is adjusted according to the monitored real-time rotating speed of the engine, and a proper engine braking mode is selected, so that the engine can exert the maximum braking power under different rotating speeds.
Further, in an embodiment, the adjusting module 40 is configured to:
monitoring the engine speed;
when the rotating speed of the engine is higher than a first preset value, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off, wherein the first preset value is larger than the preset rotating speed;
and when the rotating speed of the engine is lower than a second preset value, setting the braking mode of the engine to be that in-cylinder braking and exhaust braking are simultaneously started, wherein the second preset value is lower than the preset rotating speed.
In this embodiment, the engine rotation speed changes in real time under different driving conditions of the vehicle, the real-time rotation speed of the engine is monitored, when the real-time rotation speed of the engine is higher than a first preset value, if the engine braking mode is in an in-cylinder brake on state and an exhaust brake off state, the engine braking mode is kept unchanged, otherwise, the engine braking mode is set to be in an in-cylinder brake on state and an exhaust brake off state, when the engine rotation speed is lower than a second preset value, if the engine braking mode is in an in-cylinder brake and exhaust brake on state simultaneously, the engine braking mode is kept unchanged, otherwise, the engine braking mode is set to be in an in-cylinder brake and exhaust brake on state simultaneously, wherein the first preset value is larger than the preset rotation speed, the second preset value is smaller than the preset rotation speed, and an interval range formed by the first preset value and the second preset value is equivalent to a hysteresis interval, and the significance of setting the hysteresis interval is that fluctuation of the engine rotation speed can be avoided, and if the engine braking mode is frequently switched, the vehicle will be caused by shaking.
Further, in an embodiment, the engine braking apparatus further includes a state adjustment module 50 configured to:
and adjusting the braking mode of the engine according to the states of the accelerator pedal and the brake pedal.
In this embodiment, in the driving process of the vehicle, especially, the change of the accelerator pedal state and the brake pedal state is more involved, different engine braking power requirements can be brought when the accelerator pedal state and the brake pedal state are changed, and the engine braking mode is adjusted according to the accelerator pedal state and the brake pedal state so as to meet the engine braking power requirements in different accelerator pedal states and different brake pedal states.
Further, in an embodiment, the status adjustment module 50 is configured to:
when the opening degree of an accelerator pedal is detected to be larger than a first preset opening degree, the duration time that the opening degree of the accelerator pedal is larger than the first preset opening degree is detected to be larger than first preset time, and the vehicle speed is continuously increased, the braking mode of the engine is set to be that in-cylinder braking is closed, and exhaust braking is opened;
and returning to the step of monitoring the rotating speed of the engine and adjusting the braking mode of the engine according to the rotating speed of the engine when the opening degree of the brake pedal is detected to be larger than the second preset opening degree and the duration of the opening degree of the brake pedal larger than the second preset opening degree is detected to be larger than the second preset time.
In the embodiment, when the opening degree of the accelerator pedal is detected to be larger than a first preset opening degree, the duration time that the opening degree of the accelerator pedal is larger than the first preset opening degree is detected to be larger than first preset time, and the vehicle speed is continuously increased, the situation that a driver touches the accelerator pedal by mistake is considered in the embodiment, when the conditions are detected to be met, the driver needs smaller engine braking power, and the braking power of the engine is the minimum compared with other braking modes when the exhaust brake is singly started, so when the conditions are detected to be met, the braking mode of the engine is set to be in-cylinder brake closing and exhaust brake opening; in addition, when it is detected that the opening degree of the brake pedal is greater than the second preset opening degree and the duration of the opening degree of the brake pedal being greater than the second preset opening degree is greater than the second preset time, it represents that the user needs greater engine braking power, and if the braking mode of the engine is not the maximum engine braking power at this time, the braking mode of the engine needs to be switched to the braking mode capable of maximizing the engine braking power, and the step of monitoring the engine speed and adjusting the braking mode of the engine according to the engine speed, that is, monitoring the engine speed, and adjusting the braking mode of the engine according to the engine speed, is executed to enable the engine to exert the maximum braking power.
Further, in an embodiment, the engine braking apparatus further includes a determining module 60 configured to:
based on engine bench test, separately starting in-cylinder braking and simultaneously starting in-cylinder braking and engine braking, calibrating engine braking power at different engine speeds, and performing curve fitting to obtain a first braking power curve and a second braking power curve;
and determining the engine speed at the intersection point of the first brake power curve and the second brake power curve as a preset speed.
In this embodiment, in the braking modes of the three engines of individually opening the in-cylinder brake, individually opening the exhaust brake, and simultaneously opening the in-cylinder brake and the engine brake, the engine brake power of the exhaust brake is usually the smallest at different engine speeds, when the engine speed is higher than a certain value, the individually opening the in-cylinder brake is higher than the engine brake power of the simultaneously opening the in-cylinder brake and the engine brake, and when the engine speed is lower than a certain value, the simultaneously opening the in-cylinder brake and the engine brake are higher than the engine brake power of the individually opening the in-cylinder brake, so that by performing engine bench tests, the individually opening the in-cylinder brake and the simultaneously opening the in-cylinder brake and the engine brake are respectively calibrated, curve fitting is performed to obtain a first brake power curve and a second brake power curve, and the engine speed at the intersection of the first brake power curve and the second brake power curve is determined as the preset speed for adjusting the braking mode of the engine.
In a fourth aspect, the embodiment of the present invention further provides a readable storage medium.
The present invention may be said to reside in a computer readable storage medium having stored thereon an engine braking program, wherein said engine braking program, when executed by a processor, performs the steps of the engine braking method as described above.
The method for implementing the engine braking process when executed may refer to various embodiments of the engine braking method of the present invention, and will not be described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (10)
1. An engine braking method, characterized in that the engine braking includes in-cylinder braking and exhaust braking, the engine braking method comprising:
when the auxiliary brake of the vehicle is detected to be turned on, the rotating speed of the engine is obtained;
if the rotating speed of the engine is higher than the preset rotating speed, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off;
if the rotating speed of the engine is lower than the preset rotating speed, setting the braking mode of the engine to be that the in-cylinder braking and the exhaust braking are simultaneously started;
the engine speed is monitored and the braking mode of the engine is adjusted according to the engine speed.
2. The engine braking method of claim 1, wherein monitoring engine speed and adjusting engine braking mode based on engine speed comprises:
monitoring the engine speed;
when the rotating speed of the engine is higher than a first preset value, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off, wherein the first preset value is larger than the preset rotating speed;
and when the rotating speed of the engine is lower than a second preset value, setting the braking mode of the engine to be that in-cylinder braking and exhaust braking are simultaneously started, wherein the second preset value is lower than the preset rotating speed.
3. The engine braking method of claim 1, after said monitoring engine speed and adjusting engine braking mode based on engine speed, comprising:
and adjusting the braking mode of the engine according to the states of the accelerator pedal and the brake pedal.
4. The engine braking method of claim 3, wherein said adjusting engine braking mode based on accelerator pedal state and brake pedal state comprises:
when the opening degree of an accelerator pedal is detected to be larger than a first preset opening degree, the duration time that the opening degree of the accelerator pedal is larger than the first preset opening degree is detected to be larger than first preset time, and the vehicle speed is continuously increased, the braking mode of the engine is set to be that in-cylinder braking is closed, and exhaust braking is opened;
and returning to the step of monitoring the rotating speed of the engine and adjusting the braking mode of the engine according to the rotating speed of the engine when the opening degree of the brake pedal is detected to be larger than the second preset opening degree and the duration of the opening degree of the brake pedal larger than the second preset opening degree is detected to be larger than the second preset time.
5. The engine braking method according to claim 1, characterized by comprising, before said obtaining the engine speed when the vehicle auxiliary brake is detected to be on,:
based on engine bench test, separately starting in-cylinder braking and simultaneously starting in-cylinder braking and engine braking, calibrating engine braking power at different engine speeds, and performing curve fitting to obtain a first braking power curve and a second braking power curve;
and determining the engine speed at the intersection point of the first brake power curve and the second brake power curve as a preset speed.
6. An engine braking device, characterized by comprising:
the acquisition module is used for acquiring the rotating speed of the engine when the opening of the auxiliary brake of the vehicle is detected;
the first setting module is used for setting the braking mode of the engine to be that the in-cylinder braking is started and the exhaust braking is closed if the rotating speed of the engine is higher than a preset rotating speed;
the second setting module is used for setting the braking mode of the engine to be that in-cylinder braking and exhaust braking are started simultaneously if the rotating speed of the engine is lower than the preset rotating speed;
and the adjusting module is used for monitoring the rotating speed of the engine and adjusting the braking mode of the engine according to the rotating speed of the engine.
7. The engine braking apparatus of claim 6, wherein the adjustment module is to:
monitoring the engine speed;
when the rotating speed of the engine is higher than a first preset value, setting the braking mode of the engine as in-cylinder braking on and exhaust braking off, wherein the first preset value is larger than the preset rotating speed;
and when the rotating speed of the engine is lower than a second preset value, setting the braking mode of the engine to be that in-cylinder braking and exhaust braking are simultaneously started, wherein the second preset value is lower than the preset rotating speed.
8. The engine braking apparatus of claim 6, further comprising a condition adjustment module to:
and adjusting the braking mode of the engine according to the states of the accelerator pedal and the brake pedal.
9. An engine braking apparatus comprising a processor, a memory, and an engine braking program stored on the memory and executable by the processor, wherein the engine braking program, when executed by the processor, implements the steps of the engine braking method of any one of claims 1 to 5.
10. A readable storage medium having an engine braking program stored thereon, wherein the engine braking program, when executed by a processor, implements the steps of the engine braking method as recited in any one of claims 1-5.
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| CN202211268144.6A CN115653764A (en) | 2022-10-17 | 2022-10-17 | Engine braking method, device, equipment and readable storage medium |
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| CN202211268144.6A CN115653764A (en) | 2022-10-17 | 2022-10-17 | Engine braking method, device, equipment and readable storage medium |
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