CN109736958A - A method of improving engine brake power - Google Patents
A method of improving engine brake power Download PDFInfo
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- CN109736958A CN109736958A CN201910218280.6A CN201910218280A CN109736958A CN 109736958 A CN109736958 A CN 109736958A CN 201910218280 A CN201910218280 A CN 201910218280A CN 109736958 A CN109736958 A CN 109736958A
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- Prior art keywords
- engine brake
- brake power
- braking
- oil spout
- improving engine
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- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a kind of methods for improving engine brake power, and ECU is made to control the oil spout of oil spout unit, to realize burning braking.I.e. under overrunning condition, ECU controls oil spout unit and supplies a certain amount of fuel oil, participates in burning, so that the high-temperature high-pressure fuel gas generated does negative work to the piston of uplink, and then the resistance of piston stroking upward is made to be greater than the resistance that pure compression air generates, to realize good braking effect.Therefore, the method proposed by the present invention for improving engine brake power, can be improved the braking power of engine, solves the problems, such as the field at this stage.
Description
Technical field
The present invention relates to engine braking fields, more specifically to a kind of method for improving engine brake power.
Background technique
With the development of technology with the improvement of road conditions, the travel speed of automobile is higher and higher, and engine power is more next
Bigger, the load-carrying of automobile and quality are consequently increased；At the same time, the running resistance of vehicle and friction loss are smaller and smaller,
And the demand for security driven and regulation are but more stringent, therefore, the braking power of engine are forced further to be promoted.
For the prior art, conventional engines are braked using compression-release type, i.e., the engine oil-break after braking is opened,
And exhaust valve is opened near lower dead center in compression stroke near top dead center, induction stroke, to generate the resistance of motion, and then will start
Machine is converted to the brake apparatus of consumption kinetic energy；Conventional exhaust door lifting curve is as shown in Figure 2.But the effect of traditional braking has
Limit, is not able to satisfy stringent driving safety demand.
Therefore, the braking power for how improving engine is the problem that the field is urgently to be resolved at this stage.
Summary of the invention
In view of this, this method can the purpose of the present invention is to provide a kind of method for improving engine brake power
The braking power for improving engine, solves the problems, such as the field at this stage.
A method of engine brake power is improved, ECU is made to control the oil spout of oil spout unit, to realize burning braking.
Preferably, the method for the raising engine brake power, engine is on the basis of compression-release type is braked
Increase the burning braking.
Preferably, the method for the raising engine brake power, under overrunning condition, in compression stroke,
ECU controls the oil spout of oil spout unit, to realize the burning braking.
Preferably, the method for the raising engine brake power, under overrunning condition, in exhaust stroke,
ECU controls the oil spout of oil spout unit, to realize the burning braking.
Preferably, the method for the raising engine brake power, in exhaust stroke, exhaust valve, which is in, closes shape
State.
Preferably, the method for the raising engine brake power opens exhaust before compression stroke reaches top dead centre
Door.
Preferably, the method for the raising engine brake power opens exhaust valve when expansion stroke is ended.
Preferably, the method for the raising engine brake power opens exhaust valve when exhaust stroke ends.
Preferably, the method for the raising engine brake power opens exhaust valve when induction stroke ends.
The method proposed by the present invention for improving engine brake power, makes ECU control the oil spout of oil spout unit, to realize burning
Braking.I.e. under overrunning condition, ECU controls oil spout unit and supplies a certain amount of fuel oil, participates in burning, so as to generate
High-temperature high-pressure fuel gas does negative work to the piston of uplink, and then the resistance of piston stroking upward is made to be greater than the resistance that pure compression air generates,
To realize good braking effect.Therefore, the method proposed by the present invention for improving engine brake power, can be improved engine
Braking power solves the problems, such as the field at this stage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of exhaust valve lift profile in the specific embodiment of the invention；
Fig. 2 is the schematic diagram of exhaust valve lift profile in background of invention.
Specific embodiment
The core of present embodiment is to provide a kind of method for improving engine brake power, and this method can mention
The braking power of high engine solves the problems, such as the field at this stage.
Hereinafter, being illustrated referring to attached drawing to embodiment.In addition, embodiments illustrated below is not to recorded in claim
Summary of the invention rise any restriction effect.In addition, the full content of composition represented by following example is not limited to as right
Necessary to the solution invented documented by it is required that.
The method for the raising engine brake power that present embodiment provides makes ECU control the oil spout of oil spout unit, with
Realize burning braking.I.e. under overrunning condition, ECU controls oil spout unit and supplies a certain amount of fuel oil, participates in burning, with
So that the high-temperature high-pressure fuel gas generated is done negative work to the piston of uplink, and then generates the resistance of piston stroking upward greater than pure compression air
Resistance, to realize good braking effect.Therefore, the method proposed by the present invention for improving engine brake power, can be improved
The braking power of engine solves the problems, such as the field at this stage.Exhaust valve lift profile referring to Figure 1-2.
The method for the raising engine brake power that present embodiment provides, engine can be in compression-release type system
Increase burning braking on the basis of dynamic, to further increase the braking ability of engine, meets stringent driving safety demand.
Further, the method for above-mentioned raising engine brake power can be in compression stroke under overrunning condition
In, so that ECU control oil spout unit is carried out oil spout, to realize burning braking, and then improve the braking power of engine, to improve system
Dynamic effect.
The method for the raising engine brake power that present embodiment provides, under overrunning condition, Ke Yi
In exhaust stroke, so that ECU control oil spout unit is carried out oil spout, it is made to participate in burning, so that the high-temperature high-pressure fuel gas generated is to upper
Capable piston does negative work, and then the resistance of piston stroking upward is made to be greater than the resistance that pure compression air generates, to realize good braking effect
Fruit.
Further, the method for improving engine brake power can control exhaust valve and be in closing shape in exhaust stroke
State, so that piston stroking upward, and then instroke is converted into another second compression stroke, to increase braking work, improve braking effect.
The method for the raising engine brake power that present embodiment provides can reach top dead centre in compression stroke
Before, exhaust valve is opened, high pressure-temperature combustion gas is discharged, and then reduces the expansion stroke portion gas to the positive work of piston,
To improve braking power, guarantee braking effect.
Further, when expansion stroke is ended, exhaust valve can be opened, to increase charge in cylinder, then closes exhaust valve；
When exhaust stroke ends, then exhaust valve is opened, high pressure gas is discharged；And when induction stroke ends, the row of being again turned on
Valve makes the gas in exhaust duct be filled with cylinder, and then increases charge in cylinder.
As shown in the above, this method make exhaust valve realize unlatching four times, that is, twice compression process and
Process is discharged twice, to considerably increase the power of braking, improves the braking effect of engine.
It should be noted that Fig. 1 is the schematic diagram of exhaust valve lift profile in the specific embodiment of the invention, the exhaust is raw
It include: expansion stroke, exhaust stroke, induction stroke, compression stroke at curve, wherein overrunning condition carries out down, is arranging
Exhaust valve is controlled in gas stroke to be in close state, so that piston stroking upward, and then instroke is converted into another second compression row
Journey to increase compression travel, and then improves the braking power of engine, meets stringent driving safety demand, and the above process
Move in circles progress, to realize good braking.
Fig. 2 is the schematic diagram of exhaust valve lift profile in background of invention, which includes: compression punching
Journey, expansion stroke, exhaust stroke, induction stroke, and the above process moves in circles progress, to realize traditional compression-release type system
It is dynamic.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of method for improving engine brake power, which is characterized in that so that ECU is controlled the oil spout of oil spout unit, to realize combustion
It fires dynamic.
2. the method according to claim 1 for improving engine brake power, which is characterized in that engine is discharged in compression
Increase the burning braking on the basis of formula braking.
3. the method according to claim 1 for improving engine brake power, which is characterized in that overrunning condition
Under, in compression stroke, ECU controls the oil spout of oil spout unit, to realize the burning braking.
4. the method according to claim 1 for improving engine brake power, which is characterized in that overrunning condition
Under, in exhaust stroke, ECU controls the oil spout of oil spout unit, to realize the burning braking.
5. the method according to claim 1 for improving engine brake power, which is characterized in that in exhaust stroke, row
Valve is in close state.
6. the method according to claim 1 for improving engine brake power, which is characterized in that in compression stroke arrival
Before stop, exhaust valve is opened.
7. the method according to claim 1 for improving engine brake power, which is characterized in that end in expansion stroke
When, open exhaust valve.
8. the method according to claim 1 for improving engine brake power, which is characterized in that end in exhaust stroke
When, open exhaust valve.
9. the method according to claim 1 for improving engine brake power, which is characterized in that end in induction stroke
When, open exhaust valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910218280.6A CN109736958A (en) | 2019-03-21 | 2019-03-21 | A method of improving engine brake power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910218280.6A CN109736958A (en) | 2019-03-21 | 2019-03-21 | A method of improving engine brake power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109736958A true CN109736958A (en) | 2019-05-10 |
Family
ID=66371108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910218280.6A Pending CN109736958A (en) | 2019-03-21 | 2019-03-21 | A method of improving engine brake power |
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| CN (1) | CN109736958A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6189504B1 (en) * | 1997-11-24 | 2001-02-20 | Diesel Engine Retarders, Inc. | System for combination compression release braking and exhaust gas recirculation |
| US20040187842A1 (en) * | 2002-12-23 | 2004-09-30 | Zhou Yang | Engine braking methods and apparatus |
| CN201133267Y (en) * | 2007-12-26 | 2008-10-15 | 奇瑞汽车股份有限公司 | Novel engine brake device |
| CN105697095A (en) * | 2014-12-15 | 2016-06-22 | 曼卡车和巴士奥地利股份公司 | Method for controlling an engine braking device and engine braking device |
| CN105736086A (en) * | 2016-02-02 | 2016-07-06 | 吉林大学 | Combustion braking and pressure reduction braking combined engine braking method and pressure reduction device |
| CN106285966A (en) * | 2015-05-12 | 2017-01-04 | 上海尤顺汽车部件有限公司 | For the engine braking methods that vehicle is slow |
| CN206942830U (en) * | 2017-06-27 | 2018-01-30 | 浙江大学 | A kind of cycle compression release type complemental brake system of engine two |
| EP3450732A1 (en) * | 2017-09-01 | 2019-03-06 | MAN Truck & Bus AG | Method for braking a combustion engine |
-
2019
- 2019-03-21 CN CN201910218280.6A patent/CN109736958A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6189504B1 (en) * | 1997-11-24 | 2001-02-20 | Diesel Engine Retarders, Inc. | System for combination compression release braking and exhaust gas recirculation |
| US20040187842A1 (en) * | 2002-12-23 | 2004-09-30 | Zhou Yang | Engine braking methods and apparatus |
| CN201133267Y (en) * | 2007-12-26 | 2008-10-15 | 奇瑞汽车股份有限公司 | Novel engine brake device |
| CN105697095A (en) * | 2014-12-15 | 2016-06-22 | 曼卡车和巴士奥地利股份公司 | Method for controlling an engine braking device and engine braking device |
| CN106285966A (en) * | 2015-05-12 | 2017-01-04 | 上海尤顺汽车部件有限公司 | For the engine braking methods that vehicle is slow |
| CN105736086A (en) * | 2016-02-02 | 2016-07-06 | 吉林大学 | Combustion braking and pressure reduction braking combined engine braking method and pressure reduction device |
| CN206942830U (en) * | 2017-06-27 | 2018-01-30 | 浙江大学 | A kind of cycle compression release type complemental brake system of engine two |
| EP3450732A1 (en) * | 2017-09-01 | 2019-03-06 | MAN Truck & Bus AG | Method for braking a combustion engine |
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Application publication date: 20190510 |
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| RJ01 | Rejection of invention patent application after publication |