CN115288862A - Brake control system and strategy of engine and storage medium - Google Patents
Brake control system and strategy of engine and storage medium Download PDFInfo
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- CN115288862A CN115288862A CN202210969155.0A CN202210969155A CN115288862A CN 115288862 A CN115288862 A CN 115288862A CN 202210969155 A CN202210969155 A CN 202210969155A CN 115288862 A CN115288862 A CN 115288862A
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- 238000011217 control strategy Methods 0.000 claims abstract description 42
- 230000007935 neutral effect Effects 0.000 claims abstract description 26
- 230000002265 prevention Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000003213 activating effect Effects 0.000 claims description 18
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 238000004590 computer program Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000010705 motor oil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/002—Electric control of rotation speed controlling air supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/008—Controlling each cylinder individually
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
- F02D9/06—Exhaust brakes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
A braking control system and strategy for an engine, and a storage medium. The invention discloses an engine brake control system.A controller executes one of an engine brake control strategy, an engine overspeed prevention brake control strategy and an engine runaway limiting brake control strategy according to one or more of five information conditions of clutch pedal release, non-neutral gear, accelerator of 0%, engine speed and brake pedal stroke. The invention has the advantages of simple braking process, safe braking and the like.
Description
Technical Field
The invention relates to the technical field of engine braking, in particular to a braking control system, a strategy and a storage medium of an engine.
Background
The engine is a device for providing power for the automobile, determines the dynamic property, economy, stability and environmental protection property of the automobile, and can be divided into a diesel engine, a gasoline engine, an electric automobile motor and a hybrid engine according to different power sources.
When the automobile runs, the phenomena of engine overspeed running and engine runaway can occur, the engine is damaged, and the automobile is extremely unsafe for users.
The overspeed protection device is a device which automatically cuts off fuel supply of an engine when the engine is overspeed due to technical faults, so that the engine is out of an overspeed state, thereby playing a role in protecting the engine. Currently, overspeed protection devices are commonly used in the field of generator sets and the like, and are generally realized through the following ways: the controller collects signals of an engine rotating speed sensor, and once the rotating speed of the engine is detected to exceed a limit value, the controller outputs control signals to the fuel cut-off electromagnetic valve through a relay contact to cut off fuel of the engine, so that the engine stops.
The existing overspeed protection devices are divided into two types: one is that when the engine works normally, the fuel cut-off electromagnetic valve is in the power-on state, when the controller detects that the engine is overspeed, the fuel cut-off electromagnetic valve is powered off, thus cutting off the fuel supply of the engine; the other mode is that when the engine works normally, the oil cut-off electromagnetic valve is not electrified, and when the controller detects that the engine is overspeed, the oil cut-off electromagnetic valve is electrified.
At present, automobiles in the market generally have the brake auxiliary braking function of in-cylinder braking and exhaust braking. With reference to detail fig. 1, the conditions of use of the in-cylinder brake: 1. the clutch pedal is released; 2. a non-neutral position; 3. the temperature of the engine oil is higher than a certain set value; 4. throttle 0%; 5. the engine speed reaches the target speed; when the five conditions are simultaneously met and a driver wants to use the in-cylinder brake to assist braking, the driver turns on a main switch of a brake system of a control console of a cab to activate the in-cylinder brake. And the use condition of the exhaust brake: 1. throttle 0%; 2. the engine speed reaches the target speed; when the two conditions are met simultaneously and the driver wants to use the exhaust brake to assist the brake, the driver turns on a main switch of the brake system of the cab console to activate the exhaust brake.
In the two brake systems, when a main switch of the brake system is closed or one of the required conditions is released, the related brake is automatically released.
In the prior art scheme, the following defects exist: 1. the brake system is characterized in that cylinder braking and exhaust braking are activated, when required conditions are met simultaneously, a driver is required to turn on a main switch of the brake system to work, the switch is controlled by the driver subjectively, calling of the brake system is not facilitated, safety of driving is not guaranteed, and economical efficiency is poor. 2. In-cylinder braking and exhaust braking can not actively restrict the engine to work under overspeed so as to avoid major faults of the engine. 3. The in-cylinder braking and the exhaust braking can not actively restrict the engine runaway so as to avoid the fatal failure of the whole engine.
In some patent documents, related automobile brake control methods are provided, such as a vehicle and a brake system and a brake control method thereof, publication No. CN 112298146A, the specification of which 38 is described in the specification, "when a driver depresses a brake pedal, in-cylinder braking can be performed simultaneously with normal service braking, or in some cases, in-cylinder braking is controlled before normal service braking".
The above background disclosure is only for the purpose of assisting understanding of the concept and technical solution of the present invention and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide a braking control system, a strategy and a storage medium of an engine, which have simple braking process and gradually increase braking effect.
To this end, the invention provides a brake control system and strategy of an engine and a storage medium.
Preferably, the invention can also have the following technical features:
a kind of engine brake control system, the controller carries out one of the engine brake control tactics, prevents the engine from overspeeding the brake control tactics, limits the engine runaway brake control tactics according to one or more of five information conditions of clutch pedal release, non-neutral gear, throttle 0%, engine speed, brake pedal journey;
the engine braking control strategy is: when the vehicle simultaneously meets the conditions that the clutch pedal is loosened, the gear is not in neutral, the accelerator is 0 percent, and the rotating speed of the engine reaches the target rotating speed, the controller executes service braking and/or activates auxiliary braking according to the stroke position of the brake pedal;
the engine overspeed prevention brake control strategy comprises the following steps: when the vehicle simultaneously meets the requirements of clutch pedal release, non-neutral gear of gears and 0% of accelerator, the controller rotates at the current engine speed P 1 And the ratio of the rated speed P of the engine, and activating corresponding auxiliary braking;
the control strategy for limiting the engine runaway brake comprises the following steps: the controller is based on the current engine speed P 2 And the rated speed P of the engine, adopt and close the air throttle, activate one or more of the braking modes in the cylinder braking, exhaust braking;
P 2 ＞P 1 p > target speed.
An engine braking control strategy comprising the steps of:
1) Installing a displacement sensor for acquiring the stroke of a brake pedal, wherein the displacement sensor is in signal connection with a controller;
2) Acquiring information including a clutch pedal, a vehicle gear, an accelerator state, an engine speed and a brake pedal with a displacement sensor through a controller;
3) When the vehicle simultaneously meets the conditions that the clutch pedal is loosened, the gear is not in neutral, the accelerator is 0 percent, and the rotating speed of the engine reaches the target rotating speed, the controller executes service braking and/or activates auxiliary braking according to the stroke position of the brake pedal; the auxiliary braking includes one or both of in-cylinder braking and exhaust braking of the vehicle.
Further, the controller is an ECU.
Further, when four conditions of clutch pedal loosening, gear non-neutral, accelerator 0% and engine speed reaching the target speed are met, in-cylinder braking and exhaust braking can be activated step by step through different travel positions of a brake pedal; when one of the four conditions is not met, the vehicle releases the corresponding auxiliary brake, and only service brake is executed by stepping on the brake pedal.
Further, in step 3, firstly, the stroke position of the brake pedal is obtained through the controller, and then a corresponding braking process is executed according to the stroke position of the brake pedal; when the stroke of the brake pedal is in a first preset stroke L 1 When the vehicle is in use, only the service brake of the vehicle is executed; when the stroke of the brake pedal is in a second preset stroke L 2 When the brake is used, the first-stage brake of the brake in the cylinder is activated to add the brake, and the driving brake is assisted to brake the vehicle; when the stroke of the brake pedal is in a third preset stroke L 3 When the brake is started, the secondary brake of the brake in the cylinder is activated to be added into the brake; when the stroke of the brake pedal is in a fourth preset stroke L 4 When active, exhaust braking is activated and brake is added.
Further, the total stroke L of the brake pedal is a first preset stroke L 1 Comprises the following steps: 0 < L 1 Less than or equal to 20 percent; second preset stroke L 2 Comprises the following steps: 20% L < L 2 Less than or equal to 45 percent; third preset stroke L 3 Comprises the following steps: 45% L < L 3 Less than or equal to 75 percent; fourth preset stroke L 4 Comprises the following steps: 75% L < L 4 。
An engine overspeed prevention brake control strategy comprising the steps of:
a. acquiring information including a clutch pedal, a vehicle gear, an accelerator state and an engine speed through a controller;
b. when the vehicle simultaneously meets the requirements of clutch pedal release, non-neutral gear of gears and 0% of accelerator, the controller rotates at the current engine speed P 1 And the ratio of the rated speed P of the engine, and activating corresponding auxiliary braking; the auxiliary brake comprises vehicle cylinder brake and exhaust brake, and the cylinder brake or the cylinder brake and the exhaust brake are executed simultaneously according to the ratio.
Further, the controller is an ECU.
Further, a rated rotation speed P is set by the controller whenThe engine speed is greater than n 1 When the rated rotating speed is doubled, activating the first-stage braking of the in-cylinder braking; when the engine speed is greater than n 2 When the rated rotating speed is doubled, activating the secondary braking of the braking in the cylinder and adding the braking; when the engine speed is greater than n 3 Activating exhaust brake and adding brake when the rated rotating speed is doubled; when the engine speed is greater than n 4 When the speed is doubled to the rated speed P, the engine is prompted to overspeed by voice, and a driver is requested to decelerate; when the engine speed is lower than n 1 When the double rated rotating speed P or the conditions of clutch pedal loosening, non-neutral gear and accelerator 0% are not met simultaneously, the engine overspeed prevention brake control strategy is released; in the numerical comparison, n 1 ＜n 2 ＜n 3 ＜n 4 。
A computer readable storage medium storing computer program instructions which, when executed on a computer, implement the brake control strategy described above.
Compared with the prior art, the invention has the advantages that: the invention discloses three brake control methods to ensure the driving safety of vehicles, improve the fuel economy, protect the working reliability of engines and avoid huge loss caused by unnecessary major or fatal faults. The clutch pedal is in a second preset stroke L 2 The auxiliary brake is started to be activated, so that early intervention of in-cylinder braking can be avoided, and the problem that driving safety is influenced by inertia of a vehicle suddenly rushing forwards under the action of inertia when in-cylinder braking is quitted is solved.
Drawings
Fig. 1 is a flow chart of a prior art in-cylinder brake control.
FIG. 2 is a flow chart of the present invention for controlling the braking system.
FIG. 3 is a control flow diagram of the engine braking control strategy of the present invention.
FIG. 4 is a flowchart of the engine overspeed prevention brake control strategy of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Non-limiting and non-exclusive embodiments will be described with reference to the following drawings, wherein like reference numerals refer to like parts, unless otherwise specified.
An engine brake control system as shown in fig. 2, characterized in that: the controller executes one of an engine braking control strategy, an engine overspeed prevention braking control strategy and an engine runaway limitation braking control strategy according to one or more of five information conditions of clutch pedal release, non-neutral gear, accelerator of 0%, engine speed and brake pedal stroke;
the engine braking control strategy is: when the vehicle simultaneously meets the conditions that the clutch pedal is loosened, the gear is not in neutral, the accelerator is 0 percent, and the rotating speed of the engine reaches the target rotating speed, the controller executes service braking and/or activates auxiliary braking according to the stroke position of the brake pedal;
the engine overspeed prevention brake control strategy comprises the following steps: when the vehicle simultaneously meets the requirements of clutch pedal loosening, gear non-neutral gear and accelerator 0%, the controller controls the engine to rotate at the current speed P 1 And the ratio of the rated rotating speed P of the engine, and activating corresponding auxiliary braking;
the control strategy for limiting the engine runaway brake comprises the following steps: the controller is based on the current engine speed P 2 And the rated speed P of the engine, and adopts one or more braking modes of closing a throttle valve, activating in-cylinder braking and exhausting braking; p is 2 ＞1.2P；
P 2 ＞P 1 ＞P。
Specifically, the control strategy braking mode instruction I for limiting the engine runaway is used for limiting the current engine speed P 2 When the speed is more than 1.25 times of the rated speed P, the ECU instructs oil cut;
the control strategy braking mode instruction II for limiting the engine runaway is used for limiting the current engine rotating speed P 2 When the speed is more than 1.30 times of the rated speed P, the braking mode instruction I is executed, and the throttle valve is instructed to be closed to 50 percent, or between 1.25 and 1.30 times of the rated speed PThe valve is gradually closed from 0% to 50%.
The control strategy braking mode instruction III for limiting the engine runaway is used, such as the current engine speed P 2 When the speed is more than 1.35 times of the rated speed P, the braking mode instruction II is executed, and the throttle valve is closed to 100% by instruction, or the throttle valve is closed to 100% from 50% gradually between 1.30-1.35 times of the rated speed;
the control strategy braking mode instruction IV for limiting the engine runaway is used for limiting the current engine speed P 2 And when the speed is more than 1.40 times of the rated speed P, the in-cylinder brake and the exhaust brake are activated (if the in-cylinder brake and the exhaust brake function are simultaneously realized) while the braking mode command III is executed.
As shown in FIG. 3, an engine braking control strategy includes the steps of:
1) A displacement sensor is arranged on a brake pedal and used for acquiring the stroke of the brake pedal, and the displacement sensor is in signal connection with a controller;
2) Acquiring information including a clutch pedal, a vehicle gear, an accelerator state, an engine speed and a brake pedal with a displacement sensor through a controller;
3) When the vehicle simultaneously meets the conditions that the clutch pedal is loosened, the gear is not in neutral, the accelerator is 0 percent, and the rotating speed of the engine reaches the target rotating speed, the controller executes service braking and/or activates auxiliary braking according to the stroke position of the brake pedal. The auxiliary brake comprises one or two of vehicle in-cylinder brake and exhaust brake so as to gradually improve the auxiliary brake effect. In the prior art, a main switch of a brake system is used as a necessary condition for activating auxiliary brake, so that the operation difficulty of a driver is increased, and particularly when the auxiliary brake needs to be activated immediately in an emergency, the starting time for activating the auxiliary brake is delayed due to the main switch of the brake system. Moreover, if the main switch of the braking system is turned on, the driver forgets to turn off the main switch, so that the potential safety driving hazard is increased. This application cancellation braking system master switch cancels the restriction of machine oil temperature, introduces auxiliary brake through brake pedal stroke position control, and easy operation, convenience, safety more are favorable to improving economic nature.
Specifically, when the clutch pedal is loosened, the gear is not neutral, the accelerator is in 0 percent, and the rotating speed of the engine reaches the target rotating speed, the in-cylinder brake and the exhaust brake can be activated step by step through different travel positions of the brake pedal only under the condition that the four conditions are met simultaneously; when one of the four conditions is not met, the vehicle releases the corresponding auxiliary brake, and only service braking is executed by stepping on the brake pedal. Therefore, the driver can select different auxiliary braking to be added according to the braking requirement through the limitation of four precondition.
The controller is an ECU. The ECU executes a control command to implement the vehicle braking control method, and acquires information including a clutch pedal, a vehicle gear, an accelerator state and an engine speed; when the vehicle simultaneously meets the conditions of clutch pedal release, gear non-neutral, accelerator 0% and engine speed reaching the target speed, the brake pedal is stepped down, and the vehicle auxiliary brake is activated according to the travel position information of the brake pedal.
In step 3, firstly, the stroke position of the brake pedal is obtained through the controller, and then a corresponding braking process is executed according to the stroke position of the brake pedal. Specifically, taking a 6-cylinder machine as an example, when the stroke of the brake pedal is at a first preset stroke L 1 When the vehicle is in use, only the service brake of the vehicle is executed; when the stroke of the brake pedal is in a second preset stroke L 2 When the brake is used, primary braking (3 cylinders in a 6-cylinder machine execute in-cylinder braking) of in-cylinder braking is activated to add braking, and the driving braking is assisted to brake the vehicle; when the stroke of the brake pedal is in a third preset stroke L 3 When the brake is used, secondary braking of in-cylinder braking is activated (the other 3 cylinders of the 6-cylinder machine are added to perform in-cylinder braking, namely 6 cylinders perform in-cylinder braking) and added to braking; when the stroke of the brake pedal is in a fourth preset stroke L 4 When the brake is activated, exhaust brake is activated and brake is added. In the braking process of the embodiment, even if the clutch pedal is loosened, the gear is not in neutral, the accelerator is 0 percent and the rotating speed of the engine reaches the target rotating speed, the clutch pedal stroke is in the second preset stroke L 2 The auxiliary brake is only activated. The braking effect is increased step by step, the braking mode is flexible, and early intervention of braking in the cylinder can be avoided. If the auxiliary brake is in the first preset stroke L 1 Namely, the vehicle is involved, when the braking in the cylinder is withdrawn, the vehicle has inertia suddenly rushing forwards under the action of the inertia, and the driving safety is influenced.
A multi-stage control braking strategy is formed by utilizing a braking mode to be executed by presetting the stroke of a brake pedal by a controller, and the braking adaptability is flexible. Setting the total stroke L of the brake pedal and the first preset stroke L 1 Comprises the following steps: 0 < L 1 Less than or equal to 20% (20% L represents 20% of the total stroke of the brake pedal), a second preset stroke L 2 Comprises the following steps: 20% L < L 2 L ≦ 45 ≦ L (45 ≦ L representing 45% of the total stroke of the brake pedal), a third preset stroke L 3 Comprises the following steps: 45% L < L 3 L ≦ 75% (75%; fourth preset stroke L 4 Comprises the following steps: 75% L < L 4 。
With reference to fig. 4, an engine overspeed prevention brake control strategy includes the following steps:
a. acquiring information including a clutch pedal, a vehicle gear, an accelerator state and an engine speed through a controller;
b. when the vehicle simultaneously meets the requirements of clutch pedal loosening, gear non-neutral gear and accelerator 0%, the controller activates corresponding auxiliary braking according to the ratio of the current engine speed P1 to the rated engine speed P. The auxiliary brake comprises vehicle in-cylinder brake and exhaust brake, and the in-cylinder brake or the in-cylinder brake and the exhaust brake are executed simultaneously according to the ratio.
The controller is an ECU. When the ECU executes a control command, the brake control method for preventing the engine from overspeed is implemented, and information including a clutch pedal, a vehicle gear, an accelerator state and the engine speed is obtained through the ECU; when the vehicle simultaneously meets the requirements of clutch pedal release, non-neutral gear of gears and 0% of accelerator, the controller rotates at the current engine speed P 1 And the ratio of the rated rotating speed P of the engine, and activating corresponding auxiliary braking; the auxiliary brake comprises vehicle in-cylinder brake and exhaust brake, and the in-cylinder brake or the in-cylinder brake and the exhaust brake are executed simultaneously according to the ratio.
Specifically, the nominal speed P is set by the controller. Taking a 6-cylinder engine as an example, when the engine speed is highAt n is 1 When the rated rotating speed is doubled, activating primary braking of in-cylinder braking (3 cylinders in 6-cylinder machines execute in-cylinder braking); when the engine speed is greater than n 2 When the rated rotating speed is doubled, activating secondary braking of in-cylinder braking (the other 3 cylinders of the 6-cylinder machine are added into the execution cylinder for braking, namely 6 cylinders are used for executing in-cylinder braking) and adding the braking; when the engine speed is greater than n 3 Activating exhaust brake and adding brake when the rated rotating speed is doubled; when the engine speed is greater than n 4 When the speed is double the rated speed P, the engine is prompted to overspeed by voice to request the driver to decelerate. In the numerical comparison, n 1 ＜n 2 ＜n 3 ＜n 4 。
In a specific embodiment, n 1 Is 1.130; n is 2 Is 1.145; n is 3 Is 1.160; n is 4 Is 1.175.n is 1 、n 2 、n 3 、n 4 The value of (c) may be calibrated according to the engine model.
When the engine speed is lower than n 1 And when the double rated rotating speed P or the conditions of clutch pedal loosening, non-neutral gear and 0% of accelerator are not met simultaneously, the engine overspeed braking control strategy is released.
A computer-readable storage medium, characterized in that: for storing computer program instructions which, when run on a computer, implement the brake control strategy described above.
Those skilled in the art will recognize that numerous variations are possible in light of the above description, and therefore the examples and drawings are merely intended to describe one or more specific embodiments.
While there has been described and illustrated what are considered to be example embodiments of the present invention, it will be understood by those skilled in the art that various changes and substitutions may be made therein without departing from the spirit of the invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from the central concept described herein. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments and equivalents falling within the scope of the invention.
Claims (10)
1. An engine brake control system characterized by: the controller executes one of an engine braking control strategy, an engine overspeed prevention braking control strategy and an engine runaway limitation braking control strategy according to one or more of five information conditions of clutch pedal release, non-neutral gear, accelerator of 0%, engine speed and brake pedal stroke;
the engine braking control strategy is: when the vehicle simultaneously meets the conditions that the clutch pedal is loosened, the gear is not in neutral, the accelerator is 0 percent, and the rotating speed of the engine reaches the target rotating speed, the controller executes service braking and/or activates auxiliary braking according to the stroke position of the brake pedal;
the engine overspeed prevention brake control strategy comprises the following steps: when the vehicle simultaneously meets the requirements of clutch pedal release, gear non-neutral gear and accelerator 0%, the controller activates corresponding auxiliary brake according to the ratio of the current engine speed P1 to the rated engine speed P;
the control strategy for limiting the engine runaway brake comprises the following steps: the controller adopts one or more braking modes of closing a throttle valve, activating in-cylinder braking and exhausting braking according to the ratio of the current engine rotating speed P2 to the rated engine rotating speed P;
p2 is more than P1 and more than P is more than the target rotating speed.
2. An engine braking control strategy characterized by: the method comprises the following steps:
1) A displacement sensor is arranged and used for acquiring the stroke of a brake pedal, and the displacement sensor is in signal connection with a controller;
2) Acquiring information including a clutch pedal, a vehicle gear, an accelerator state, an engine speed and a brake pedal with a displacement sensor through a controller;
3) When the vehicle simultaneously meets the conditions that the clutch pedal is loosened, the gear is not in neutral, the accelerator is 0 percent, and the rotating speed of the engine reaches the target rotating speed, the controller executes service braking and/or activates auxiliary braking according to the stroke position of the brake pedal; the auxiliary braking includes one or both of in-cylinder braking and exhaust braking of the vehicle.
3. An engine braking control strategy as set forth in claim 2 wherein: the controller is an ECU.
4. An engine braking control strategy as set forth in claim 2 wherein: when four conditions of clutch pedal loosening, gear non-neutral, accelerator 0% and engine rotating speed reaching the target rotating speed are met, cylinder braking and exhaust braking can be activated step by step through different travel positions of a brake pedal; when one of the four conditions is not met, the vehicle releases the corresponding auxiliary brake, and only service braking is executed by stepping on the brake pedal.
5. An engine braking control strategy as set forth in claim 2 wherein: in step 3, firstly, the stroke position of the brake pedal is obtained through the controller, and then a corresponding braking process is executed according to the stroke position of the brake pedal; when the stroke of the brake pedal is in a first preset stroke L 1 When the vehicle is in use, only the service brake of the vehicle is executed; when the stroke of the brake pedal is in a second preset stroke L 2 When the brake is used, the first-stage brake of the brake in the cylinder is activated to add the brake, and the driving brake is assisted to brake the vehicle; when the stroke of the brake pedal is in a third preset stroke L 3 When the brake is started, the secondary brake of the brake in the cylinder is activated to be added into the brake; when the stroke of the brake pedal is in a fourth preset stroke L 4 When active, exhaust braking is activated and brake is added.
6. An engine braking control strategy as claimed in claim 5 wherein: total stroke L of brake pedal, first preset stroke L 1 Comprises the following steps: 0 < L 1 Less than or equal to 20 percent; second preset stroke L 2 Comprises the following steps: 20% L < L 2 Less than or equal to 45 percent; third preset stroke L 3 Comprises the following steps: 45% L < L 3 Less than or equal to 75 percent; fourth preset stroke L 4 Comprises the following steps: 75% L < L 4 。
7. An engine overspeed prevention brake control strategy, characterized by: the method comprises the following steps:
a. acquiring information including a clutch pedal, a vehicle gear, an accelerator state and an engine rotating speed through a controller;
b. when the vehicle simultaneously meets the requirements of clutch pedal release, non-neutral gear of gears and 0% of accelerator, the controller rotates at the current engine speed P 1 And the ratio of the rated speed P of the engine, and activating corresponding auxiliary braking; the auxiliary brake comprises vehicle in-cylinder brake and exhaust brake, and the in-cylinder brake is executed and/or the in-cylinder brake and the exhaust brake are executed according to the ratio.
8. The engine overspeed prevention brake control strategy of claim 7 wherein: the controller is an ECU.
9. An engine overspeed prevention brake control strategy as recited in claim 7, wherein: setting a rated speed P by using a controller when the engine speed is more than n 1 When the rated rotating speed is doubled, activating the first-stage braking of the in-cylinder braking; when the engine speed is greater than n 2 When the rated rotating speed is doubled, activating the secondary braking of the braking in the cylinder and adding the braking; when the engine speed is greater than n 3 When the speed is doubled to the rated speed P, activating exhaust brake and adding brake; when the engine speed is greater than n 4 When the speed is doubled from the rated speed P, the engine is prompted to overspeed by voice, and a driver is requested to decelerate; when the engine speed is lower than n 1 When the double rated rotating speed P or the conditions of clutch pedal loosening, non-neutral gear and accelerator 0% are not met simultaneously, the engine overspeed prevention brake control strategy is released; in the numerical comparison, n 1 ＜n 2 ＜n 3 ＜n 4 。
10. A computer-readable storage medium, characterized in that: for storing computer program instructions which, when run on a computer, implement the brake control strategy of any one of claims 2-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US20200317184A1 (en) * | 2019-04-08 | 2020-10-08 | GM Global Technology Operations LLC | Method for suggesting activation of an exhaust brake |
| CN112124272A (en) * | 2020-09-30 | 2020-12-25 | 湖南行必达网联科技有限公司 | Combined braking system and method for vehicle |
| CN114715088A (en) * | 2021-01-05 | 2022-07-08 | 北京福田康明斯发动机有限公司 | Method and device for controlling auxiliary braking of vehicle, storage medium and electronic device |
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| US20010016795A1 (en) * | 1998-11-13 | 2001-08-23 | Cummins Engine Company, Inc. | System and method for controlling vehicle braking operation |
| CN203098057U (en) * | 2012-12-31 | 2013-07-31 | 鲁东大学 | Braking force stepless adjustment intelligent control system of automobile exhaust brake |
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| CN115288862B (en) | 2024-02-02 |
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