CN112267943A - Protection method for over-speed dragging of engine, engine and vehicle - Google Patents
Protection method for over-speed dragging of engine, engine and vehicle Download PDFInfo
- Publication number
- CN112267943A CN112267943A CN202011112226.2A CN202011112226A CN112267943A CN 112267943 A CN112267943 A CN 112267943A CN 202011112226 A CN202011112226 A CN 202011112226A CN 112267943 A CN112267943 A CN 112267943A
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- Prior art keywords
- engine
- speed
- valve
- dragging
- over
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Classifications
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
-
- 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)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention relates to the technical field of engines, in particular to a method for protecting engine over-speed due to engine dragging, an engine and a vehicle, wherein the method for protecting the over-speed due to engine dragging comprises the following steps: when the controller judges that the engine is in a reverse dragging state, the valve is controlled to be closed; and when the controller judges that the engine is released from the dragging state, controlling the valve to return to normal. When the engine is dragged backwards, the valve is closed for a short time to avoid collision between the valve and the piston, so that the engine can be well protected, and the protection method is low in implementation cost and easy to realize engineering.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a protection method for over-speed dragging of an engine, the engine and a vehicle.
Background
In the running process of the whole vehicle, when the engine is dragged backwards due to downhill or improper operation (such as wrong gear shifting), the elastic deformation of the valve actuating mechanism can cause severe vibration of the valve, and can damage the normal work of the valve in serious cases to generate flying off and bounce, so that the valve is easy to collide with a piston, and the vibration, noise and abrasion among parts of the engine are aggravated.
Disclosure of Invention
The invention aims to provide a method for protecting engine over-speed dragging and dragging, an engine and a vehicle, and aims to solve the technical problem that a valve flies off and a piston collides when the engine is dragged and dragged in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a protection method for engine over-speed of dragging backward, when the controller judges that the engine is in the state of dragging backward, the control valve is closed; and when the controller judges that the engine is released from the dragging state, controlling the valve to return to normal.
As a preferred technical scheme of the protection method for the engine over-speed dragging, when the controller detects that the throttle signal is zero and the rotating speed of the engine continuously rises to exceed a first set rotating speed, the engine is judged to be in the over-dragging state; when the controller detects that the engine speed drops below a second set speed, the controller determines that the engine is released from the dragging state, and the second set speed is lower than the first set speed.
In a preferable technical scheme of the protection method for the engine over-speed due to the back-dragging, the difference value between the first set rotating speed and the second set rotating speed is larger than 200 r/min.
As a preferable technical scheme of the protection method for the engine over-speed dragging, the rotating speed of the engine is monitored by a rotating speed sensor in real time, and the monitored rotating speed value is sent to a controller.
As a preferable technical scheme of the protection method for the engine over-speed dragging, when the controller judges that the engine is in the over-dragging state, the controller controls the alarm device to give an alarm; and when the controller judges that the engine is in the state of releasing the back-dragging, the controller controls the alarm device to release the alarm.
As a preferable technical solution of the protection method for the engine over-speed, the controller controls the valve to switch between a normally closed state and a normal state through a switchable cam mechanism, the switchable cam mechanism includes a first cam and a second cam, when the controller controls the switchable cam mechanism to switch to the first cam, the first cam cannot drive the valve through the rocker arm, the valve is in the normally closed state, when the controller controls the switchable cam to switch to the second cam, the second cam can drive the valve through the rocker arm, and the valve can be normally opened and closed.
An engine adopts the protection method for the over-speed of the engine dragging in any scheme.
A vehicle comprising an engine as described above.
The invention has the beneficial effects that:
the invention provides a protection method for engine over-speed of dragging, when a controller judges that an engine is in a dragging state, a valve is controlled to be closed; and when the controller judges that the engine is released from the dragging state, controlling the valve to return to normal. When the engine is dragged backwards, the valve is closed for a short time to avoid collision between the valve and the piston, so that the engine can be well protected, and the protection method is low in implementation cost and easy to realize engineering.
Drawings
FIG. 1 is a schematic flow chart of a method for protecting engine over-speed due to engine drag according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a switchable cam mechanism according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;
fig. 4 is a sectional view taken along the direction B-B in fig. 2.
In the figure:
10. a first cam; 20. a second cam.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in FIG. 1, the present invention provides a method for protecting engine over-speed, when the controller determines that the engine is in the over-speed condition, the valve is controlled to close; and when the controller judges that the engine is released from the dragging state, controlling the valve to return to normal. When the engine is dragged backwards, the valve is closed for a short time to avoid collision between the valve and the piston, so that the engine can be well protected, and the protection method is low in implementation cost and easy to realize engineering.
When the controller detects that the throttle signal is zero and the rotating speed of the engine continuously rises to exceed a first set rotating speed, the engine is judged to be in a back-dragging state; when the controller detects that the rotating speed of the engine is reduced to be lower than a second set rotating speed, the controller judges that the engine is released from the dragging state, and the second set rotating speed is lower than the first set rotating speed. Preferably, the difference value between the first set rotating speed and the second set rotating speed is greater than 200r/min, so that the engine can be ensured to be in a back-dragging-free state when the engine is lower than the second set rotating speed, and frequent switching of the valve between a normally closed state and a normal state can be avoided.
Further, the controller can simultaneously control the alarm device to give an alarm when controlling the valve to be closed so as to remind a user to take braking measures in time and reduce the speed and the rotating speed of the engine; the controller can control the alarm device to release the alarm when the control valve returns to normal.
In this embodiment, the engine speed is monitored in real time by a speed sensor, and the monitored speed value is sent to the controller. The rotating speed sensor has the advantages of simple and convenient detection and reliable detection result.
In the present embodiment, referring to fig. 2 to 4, the controller controls the valve to switch between the normally closed state and the normal state through a switchable cam mechanism, the switchable cam mechanism includes a first cam 10 and a second cam 20, when the controller controls the switchable cam mechanism to switch to the first cam 10, the first cam 10 cannot drive the valve through the rocker arm, the valve is in the normally closed state, when the controller controls the switchable cam to switch to the second cam 20, the second cam 20 can drive the valve through the rocker arm, and the valve can be normally opened and closed. Of course, the above is only an exemplary illustration, and the present invention is applicable to any mechanism that can switch the valve between the normally closed state and the normal state.
The invention also provides an engine, and the protection method for the over-speed dragging of the engine is adopted, so that when the engine is dragged backwards, the valve can be closed for a short time to avoid collision between the valve and the piston, and the engine can be well protected.
The invention also provides a vehicle comprising the engine.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A protection method for engine over-speed of dragging is characterized in that when a controller judges that an engine is in a dragging state, a valve is controlled to be closed; and when the controller judges that the engine is released from the dragging state, controlling the valve to return to normal.
2. The method for protecting engine over-speed dragging according to claim 1, wherein when the controller detects that the throttle signal is zero and the engine speed continuously rises to exceed the first set speed, the engine is determined to be in the over-dragging state; when the controller detects that the engine speed drops below a second set speed, the controller determines that the engine is released from the dragging state, and the second set speed is lower than the first set speed.
3. The method for protecting engine over-running according to claim 2, wherein the difference between the first set rotational speed and the second set rotational speed is greater than 200 r/min.
4. The protection method for the over-speed of the engine due to the back-dragging according to claim 2 or 3, wherein the engine speed is monitored by a speed sensor in real time, and the monitored speed value is sent to the controller.
5. The engine over-speed protection method according to any one of claims 1 to 3, wherein the controller controls the warning device to give an alarm when the controller determines that the engine is in the over-speed state; and when the controller judges that the engine is in the state of releasing the back-dragging, the controller controls the alarm device to release the alarm.
6. The engine over-run protection method according to any one of claims 1 to 3, characterized in that the controller controls the valve to switch between the normally closed state and the normal state by a switchable cam mechanism including a first cam (10) and a second cam (20), the first cam (10) being incapable of driving the valve by a rocker arm when the controller controls the switchable cam mechanism to switch to the first cam (10), the valve being in the normally closed state, the second cam (20) being capable of driving the valve by a rocker arm when the controller controls the switchable cam mechanism to switch to the second cam (20), the valve being capable of normally opening and closing.
7. An engine characterized by the use of the method for protecting against engine over-run speed as claimed in any one of claims 1 to 6.
8. A vehicle characterized by comprising the engine of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011112226.2A CN112267943A (en) | 2020-10-16 | 2020-10-16 | Protection method for over-speed dragging of engine, engine and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011112226.2A CN112267943A (en) | 2020-10-16 | 2020-10-16 | Protection method for over-speed dragging of engine, engine and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112267943A true CN112267943A (en) | 2021-01-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011112226.2A Pending CN112267943A (en) | 2020-10-16 | 2020-10-16 | Protection method for over-speed dragging of engine, engine and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112267943A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980060440A (en) * | 1996-12-31 | 1998-10-07 | 박병재 | Engine protector |
| JP2004169646A (en) * | 2002-11-21 | 2004-06-17 | Toyota Motor Corp | Internal combustion engine having variable valve system |
| JP2006152968A (en) * | 2004-11-30 | 2006-06-15 | Toyota Motor Corp | Controller of internal combustion engine with variable valve timing mechanism |
| JP2011021499A (en) * | 2009-07-13 | 2011-02-03 | Isuzu Motors Ltd | Internal combustion engine and method for controlling the same |
| US20140261314A1 (en) * | 2013-03-15 | 2014-09-18 | Paccar Inc | Engine overspeed shutdown systems and methods |
| CN107013345A (en) * | 2015-10-26 | 2017-08-04 | 福特环球技术公司 | Device for controlling explosive motor |
| CN109458261A (en) * | 2018-10-24 | 2019-03-12 | 安徽江淮汽车集团股份有限公司 | A kind of cylinder deactivation implementation method and device |
-
2020
- 2020-10-16 CN CN202011112226.2A patent/CN112267943A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980060440A (en) * | 1996-12-31 | 1998-10-07 | 박병재 | Engine protector |
| JP2004169646A (en) * | 2002-11-21 | 2004-06-17 | Toyota Motor Corp | Internal combustion engine having variable valve system |
| JP2006152968A (en) * | 2004-11-30 | 2006-06-15 | Toyota Motor Corp | Controller of internal combustion engine with variable valve timing mechanism |
| JP2011021499A (en) * | 2009-07-13 | 2011-02-03 | Isuzu Motors Ltd | Internal combustion engine and method for controlling the same |
| US20140261314A1 (en) * | 2013-03-15 | 2014-09-18 | Paccar Inc | Engine overspeed shutdown systems and methods |
| CN107013345A (en) * | 2015-10-26 | 2017-08-04 | 福特环球技术公司 | Device for controlling explosive motor |
| CN109458261A (en) * | 2018-10-24 | 2019-03-12 | 安徽江淮汽车集团股份有限公司 | A kind of cylinder deactivation implementation method and device |
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