CN115506898A - Control device and control method for dynamic graded exhaust brake - Google Patents
Control device and control method for dynamic graded exhaust brake Download PDFInfo
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- CN115506898A CN115506898A CN202211187260.5A CN202211187260A CN115506898A CN 115506898 A CN115506898 A CN 115506898A CN 202211187260 A CN202211187260 A CN 202211187260A CN 115506898 A CN115506898 A CN 115506898A
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- Prior art keywords
- brake
- exhaust
- solenoid valves
- dynamic
- command
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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
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/501—Vehicle speed
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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
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/702—Road conditions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (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)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a control device and a control method for dynamic graded exhaust braking, wherein the control method comprises the following steps: when receiving a command of a driver Ture1, closing one brake solenoid valve in a plurality of branch circuits to execute two cylinders to exhaust brake, and normally opening the rest cylinders to exhaust; when a Ture2 command of a driver is received, two brake solenoid valves in a plurality of branch circuits are closed to execute four-cylinder exhaust brake, and the rest cylinders are opened to exhaust normally; and closing all the brake solenoid valves among the plurality of branch circuits to perform all the cylinder exhaust brakes when a command of the driver tune 3 is received. According to the control method of the dynamic graded exhaust brake, when the exhaust brake is needed, a driver can select different gears according to the gradient, the vehicle speed and the downhill distance, the exhaust brake gear switch is turned on, the accelerator pedal and the clutch pedal are released, and the fuel cut-off mechanism starts to work.
Description
Technical Field
The invention relates to the field of auxiliary braking of internal combustion engines, in particular to a control device and a control method for dynamic graded exhaust braking.
Background
Exhaust braking is a set of independent braking systems used to assist the service brakes in braking. The exhaust brake mainly has the advantages that under the condition that a service brake is not used or is rarely used, an exhaust channel is blocked by a butterfly valve arranged in an exhaust pipe, and meanwhile, a cylinder brake drives a seated exhaust valve to move downwards to open the exhaust valve, so that the exhaust resistance when the engine is dragged backwards is increased, namely, the engine providing power for the vehicle is changed into an air compressor consuming the kinetic energy of the vehicle, and the speed reducing function of reducing the running speed of the vehicle is realized;
the engine braking speed is greatly influenced by the exhaust braking strength, and the current mode for realizing the engine exhaust braking is generally 2 braking modes: 1) Primary braking; 2) And (5) secondary braking.
Primary braking: the brake handle or the button has only 1 gear, and the whole cylinder participates in the brake work during braking, so that the brake strength is high, and the vehicle speed requirement of long-distance downhill road section driving is not facilitated.
Secondary braking: the brake handle or the button has 2 high gears and low gears, the low gear working cylinder is fixed to brake by 1, 2 and 3 cylinders, the abrasion to parts is large, and the high gear is (1.2.3) + (4.5.6) full-cylinder brake.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a control device of a dynamic graded exhaust brake, which can enable a driver to select different gears according to gradient, vehicle speed and downhill distance when the exhaust brake is needed, turn on an exhaust brake gear switch, release an accelerator pedal and a clutch pedal and start an oil cut-off mechanism to work.
Another object of the present invention is to provide a method of controlling dynamic staged exhaust braking.
In order to achieve the aim, the invention provides a control device for dynamic graded exhaust braking, which comprises a plurality of branch circuits, wherein each branch circuit comprises a braking electromagnetic valve which is connected with in-cylinder brakes of two adjacent cylinders in series; wherein the number of branch circuits is half of the number of cylinders.
In a preferred embodiment, the control device for dynamic staged exhaust braking further comprises a timer, a register and an actuator; the timer is used for recording the opening times of the inlet valve of each cylinder; the register is used for registering the information recorded by the timer; an actuator; the brake electromagnetic valve, the timer, the register and the actuator of each branch circuit are all connected with the whole vehicle controller.
In order to achieve the above object, the present invention provides a control method of a dynamic hierarchical exhaust brake, which applies the control device as described above, the control method comprising: when receiving a command of a driver Ture1, closing one brake solenoid valve in a plurality of branch circuits to execute two cylinders to exhaust brake, and normally opening the rest cylinders to exhaust; when receiving a Ture2 command of a driver, closing two brake solenoid valves in a plurality of branch circuits to execute four-cylinder exhaust brake, and normally opening exhaust of the rest cylinders; and closing all the brake solenoid valves among the plurality of branch circuits to perform all the cylinder exhaust brakes when a command of the driver tune 3 is received.
In a preferred embodiment, prior to executing a Ture1, ture2, or Ture3 command, the method of controlling dynamic staged exhaust braking further comprises: initializing a timer and a register; feeding back information of the timer and the register through the communication equipment; processing information fed back by the communication equipment by the vehicle controller; and the finished vehicle controller judges and votes the processed information and outputs a judgment result to the actuator.
In a preferred embodiment, the control method of the dynamic stepped exhaust brake further includes: and if the output judgment result does not accord with the execution condition of the actuator, the actuator feeds back the judgment result to the communication equipment.
In a preferred embodiment, the control method of the dynamic stepped exhaust brake further includes: the counter uses the opening times of an air inlet valve of a certain air cylinder as pulse counting, and uses certain pulse counting as a pulse period.
In a preferred embodiment, the control method of the dynamic stepped exhaust brake further includes: when executing the Ture1 command, sequentially switching off one brake solenoid valve in the plurality of branch line circuits until all the brake solenoid valves in the plurality of branch line circuits are all closed every pulse period; when a Ture2 command is executed, two brake solenoid valves in the branch line circuits are closed simultaneously, the rest brake solenoid valves are opened, after 0.5 pulse period, one of the two closed brake solenoid valves is opened, meanwhile, one of the rest brake solenoid valves is closed, after 0.5 pulse period, the other of the two closed brake solenoid valves is opened, and the rest brake solenoid valves are closed again; the working time of the closing of the brake electromagnetic valves is counted, and each brake electromagnetic valve is opened and closed in sequence after working for one pulse period.
In a preferred embodiment, the pulse period is 120 pulse counts.
Compared with the prior art, the control device and the control method for the dynamic graded exhaust brake have the following beneficial effects: the driver can select three gears of high, medium and low required to control the sliding distance and the braking speed of the vehicle according to the gradient, the speed and the downhill distance; and a plurality of electromagnetic valves are used simultaneously, and after receiving a driver instruction, the plurality of electromagnetic valves are alternately braked.
Drawings
FIG. 1 is a schematic control circuit diagram of a control device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the control principle of a control method according to an embodiment of the present invention;
fig. 3 is a control flow diagram of a control method according to an embodiment of the invention.
Description of the main reference numbers:
p1, P2 and P3 are braking electromagnetic valves, and ECU is a vehicle control unit.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1, a control device for dynamic hierarchical exhaust braking according to a preferred embodiment of the present application includes a plurality of branch circuits each including a brake solenoid valve P1, P2, or P3 connected in series with in-cylinder brakes of adjacent two cylinders. Wherein the number of branch circuits is half of the number of cylinders. This fact is exemplified by a six-cylinder engine, and thus the number of the branch circuit and the brake solenoid valve P1, P2 or P3 is illustrated as three, which is merely an example, and the present invention is not limited thereto.
In some embodiments, the control means for dynamic staged exhaust braking further comprises a timer, a register, and an actuator. The timer is used for recording the opening times of the intake valve of each cylinder. The register is used for registering the information recorded by the timer. The actuator is used for driving the seated exhaust valve to move downwards, so that the exhaust valve is opened to generate braking force. The ECU of the vehicle controller controls the braking system by controlling the on-off of the electromagnetic relay; the braking electromagnetic valve P1, P2 or P3, the timer, the register and the actuator of each branch circuit are connected with the ECU of the whole vehicle controller.
As shown in fig. 2 to 3, to achieve the above object, the present application provides a control method of dynamic stepped exhaust brake, which applies the control device as described above, when the exhaust brake is needed, the driver can select different gears according to the gradient, the vehicle speed and the downhill distance, turn on the exhaust brake gear switch and release the accelerator pedal and the clutch pedal, and the fuel cut-off mechanism starts to work (as shown in table one). The control method comprises the following steps: when a command of the driver Ture1 is received, one brake solenoid valve P1 among the plurality of branch circuits is closed to perform two cylinder exhaust brakes, and the remaining cylinders are normally opened for exhaust. When receiving a command of a driver Ture2, closing two brake solenoid valves P1 and P3 in a plurality of branch circuits to execute four-cylinder exhaust brake, and normally opening exhaust of the rest cylinders; and closing all the brake solenoid valves P1, P2, and P3 among the plurality of branch circuits to perform all the cylinder exhaust brakes when a command of the driver tune 3 is received.
Table one: exhaust brake on condition
Referring to fig. 3, in an embodiment, before executing the Ture1, ture2, or Ture3 command, the method for controlling the dynamic stepped exhaust brake further includes: initializing a timer and a register, defaulting initial judgment by the ECU of the vehicle controller, outputting a judgment result to an actuator, and executing the on-off of a certain electromagnetic relay;
after executing a Ture1, ture2 or Ture3 command to carry out primary judgment, feeding back information of a timer and a register through communication equipment; the ECU of the vehicle controller processes information fed back by the communication equipment; and the ECU of the vehicle controller judges and votes the processed information and outputs a judgment result to the actuator.
In some embodiments, the method of controlling dynamic staged exhaust braking further comprises: and if the output judgment result does not accord with the execution condition of the actuator, the actuator feeds the judgment result back to the communication equipment.
In some embodiments, the method of controlling dynamic staged exhaust braking further comprises: the counter uses the opening times of an intake valve of a certain cylinder as pulse counting, uses certain pulse counting as a pulse period, and uses the pulse period as 120 pulse counting.
Referring to fig. 2, in some embodiments, the method for controlling dynamic staged exhaust braking further comprises: when executing the Ture1 command, one brake solenoid valve in the plurality of branch circuits is closed in sequence every pulse period, and the closing sequence can be, but is not limited to, P2-P1-P3-P2 until all brake solenoid valves P1, P2 or P3 in the plurality of branch circuits are closed. And when the fire 2 command is executed, simultaneously closing two brake solenoid valves in the plurality of branch line circuits, opening the rest brake solenoid valves, after 0.5 pulse cycles, opening one of the two simultaneously closed brake solenoid valves, simultaneously closing one of the rest brake solenoid valves, after 0.5 pulse cycles, opening the other one of the two simultaneously closed brake solenoid valves, and further closing one of the rest brake solenoid valves. The working time of closing the brake solenoid valves P1, P2 or P3 is counted, each brake solenoid valve P1, P2 or P3 is opened and closed in sequence after working for one pulse period, and the brake solenoid valves which quit working in sequence can still be regarded as P2-P1-P3-P2.
As described above, the control apparatus and control method of the dynamic stepped exhaust brake of the present invention have the following advantages: the driver can select three gears of high, medium and low required to control the sliding distance and the braking speed of the vehicle according to the gradient, the speed and the downhill distance; and a plurality of electromagnetic valves are used simultaneously, and after receiving a driver instruction, the plurality of electromagnetic valves are alternately braked.
The foregoing descriptions of specific exemplary embodiments of the present application have been presented for purposes of illustration and description. It is not intended to limit the application to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the present application and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the present application and various alternatives and modifications thereof. It is intended that the scope of the application be defined by the claims and their equivalents.
Claims (8)
1. A control device of a dynamic hierarchical exhaust brake, characterized by comprising:
each branch circuit comprises a brake solenoid valve which is connected with the in-cylinder brakes of two adjacent cylinders in series;
wherein the number of the branch circuits is half of the number of cylinders.
2. The control apparatus of a dynamic staged exhaust brake as set forth in claim 1, further comprising:
a timer to record the number of times of opening of an intake valve of each cylinder;
a register to register information recorded by the timer; and
an actuator is arranged on the base plate, and the actuator,
the brake electromagnetic valve, the timer, the register and the actuator of each branch circuit are all connected with a vehicle control unit.
3. A control method of a dynamic hierarchical exhaust brake, to which the control apparatus of claim 2 is applied, characterized by comprising:
when receiving a Ture1 command of a driver, closing one brake solenoid valve in the branch circuits to execute two cylinder exhaust brakes, and normally opening exhaust for the rest cylinders;
when receiving a Ture2 command of a driver, closing two brake solenoid valves in the branch circuits to execute four cylinder exhaust brakes, and normally opening exhaust of the rest cylinders; and
when a command of the driver Ture3 is received, all the brake solenoid valves among the plurality of branch circuits are closed to perform all the cylinder exhaust brakes.
4. The control method of dynamic staged exhaust brake as defined in claim 3, wherein prior to executing a tune 1, tune 2 or tune 3 command, the control method further comprises:
initializing the timer and the register;
feeding back the information of the timer and the register through communication equipment;
processing information fed back by the communication equipment by the vehicle controller;
and the finished vehicle controller judges and votes the processed information and outputs a judgment result to the actuator.
5. The method of controlling a dynamic staged exhaust brake as set forth in claim 4, further comprising: and if the output judgment result does not accord with the execution condition of the actuator, the actuator feeds the judgment result back to the communication equipment.
6. The method of controlling a dynamic staged exhaust brake as set forth in claim 4, further comprising: the counter uses the opening times of an air inlet valve of a certain air cylinder as pulse counting, and uses certain pulse counting as a pulse period.
7. The method of controlling a dynamic staged exhaust brake as set forth in claim 6, further comprising:
when executing the Ture1 command, each pulse period is passed, one brake solenoid valve in the plurality of branch line circuits is closed in sequence until all brake solenoid valves in the plurality of branch line circuits are closed; and
when a fire 2 command is executed, simultaneously closing two brake solenoid valves in the branch line circuits, opening the rest of the brake solenoid valves, after 0.5 pulse cycles, opening one of the two simultaneously closed brake solenoid valves, simultaneously closing one of the rest of the brake solenoid valves, after 0.5 pulse cycles, opening the other one of the two simultaneously closed brake solenoid valves, and further closing one of the rest of the brake solenoid valves;
counting the working time of the closing of the brake electromagnetic valves, and sequentially opening and closing each brake electromagnetic valve after working for one pulse period.
8. The method of controlling dynamic staged exhaust braking as claimed in claim 6, wherein said pulse period is 120 pulse counts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211187260.5A CN115506898A (en) | 2022-09-28 | 2022-09-28 | Control device and control method for dynamic graded exhaust brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211187260.5A CN115506898A (en) | 2022-09-28 | 2022-09-28 | Control device and control method for dynamic graded exhaust brake |
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| Publication Number | Publication Date |
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| CN115506898A true CN115506898A (en) | 2022-12-23 |
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| CN202211187260.5A Pending CN115506898A (en) | 2022-09-28 | 2022-09-28 | Control device and control method for dynamic graded exhaust brake |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005002870A (en) * | 2003-06-11 | 2005-01-06 | Nissan Diesel Motor Co Ltd | Exhaust braking device |
| CN102889138A (en) * | 2012-09-21 | 2013-01-23 | 三一重工股份有限公司 | Engine exhaust brake control device and method and engineering vehicle |
| CN105545497A (en) * | 2015-12-25 | 2016-05-04 | 潍柴动力股份有限公司 | Engine braking system and whole vehicle braking cruise control method applying engine braking system |
| CN108412575A (en) * | 2018-03-19 | 2018-08-17 | 中国第汽车股份有限公司 | Realize the engine braking apparatus of three-stage brake performance |
| CN208831060U (en) * | 2018-09-10 | 2019-05-07 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
| US20200156613A1 (en) * | 2018-11-21 | 2020-05-21 | Cummins Inc. | Systems and methods for engine brake diagnostics and control |
-
2022
- 2022-09-28 CN CN202211187260.5A patent/CN115506898A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005002870A (en) * | 2003-06-11 | 2005-01-06 | Nissan Diesel Motor Co Ltd | Exhaust braking device |
| CN102889138A (en) * | 2012-09-21 | 2013-01-23 | 三一重工股份有限公司 | Engine exhaust brake control device and method and engineering vehicle |
| CN105545497A (en) * | 2015-12-25 | 2016-05-04 | 潍柴动力股份有限公司 | Engine braking system and whole vehicle braking cruise control method applying engine braking system |
| CN108412575A (en) * | 2018-03-19 | 2018-08-17 | 中国第汽车股份有限公司 | Realize the engine braking apparatus of three-stage brake performance |
| CN208831060U (en) * | 2018-09-10 | 2019-05-07 | 浙江黎明发动机零部件有限公司 | A kind of electromagnetic control type engine braking apparatus |
| US20200156613A1 (en) * | 2018-11-21 | 2020-05-21 | Cummins Inc. | Systems and methods for engine brake diagnostics and control |
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