CN100582473C - Control method of diesel engine with preheating plug for low temperature cold start - Google Patents
Control method of diesel engine with preheating plug for low temperature cold start Download PDFInfo
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- 238000005728 strengthening Methods 0.000 claims description 19
- 230000001276 controlling effect Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002283 diesel fuel Substances 0.000 abstract description 3
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- 230000007613 environmental effect Effects 0.000 abstract 1
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- 239000002912 waste gas Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 13
- 239000002699 waste material Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000446 fuel Substances 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000010721 machine oil Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 201000009240 nasopharyngitis Diseases 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
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Abstract
The aim of the invention is to provide a method for controlling the low-temperature cold starting of a diesel oil engine provided with a pre-heating plug. The control method can automatically regulate the heating time of the pre-heating plug according to the external environment and the working conditions of the engine. Under the condition of ensuring that the temperature of the engine is enough high to start the engine, the control method also saves energy, and avoids damages to the pre-heating plug due to overtemperature of a cylinder. The control method divides the starting process into several different stages including early pre-heating, pre-heating stopping, reinforced pre-heating, start pre-heating and the like according to the water temperature and rotate speed information of the engine. The stages can be switched over according to the water temperature and rotate speed of the engine. At each stage, the work mode of the pre-heating plug is set according to factors such as the water temperature and rotate speed of the engine, the atmospheric pressure and the like, namely the heating time can be automatically regulated according to the change of environmental conditions, thereby optimizing the heating effect; moreover, under the condition of satisfying the low-temperature cold starting of the engine, the emission of waste gas pollutants is reduced, the energy is saved, and the service life of the pre-heating plug is prolonged.
Description
Technical field
The present invention relates to a kind of controlling method of diesel engine cold starting, particularly at the controlling method of the diesel engine cold starting that has heater plug.
Background technique
Diesel oil with atomizing during diesel engine starting sprays in the cylinder, the air that utilizes High Temperature High Pressure in the cylinder is with diesel oil ignited, temperature in the atomizing effect of fuel oil and the cylinder not only directly has influence on the case of fire of diesel engine, also is related to the content of the gas pollutant in the combustion tail gas.When low temperature, because the diesel engine water temperature is low, cause the stickiness of fuel atomization weak effect and machine oil big, mobile variation, make that the frictional force of each parts is bigger in the starting process, the diesel engine starting difficulty, therefore diesel engine need increase the auxiliary device of cold starting when cold-starting, gas in the jar or cooling water is heated, so that can quick start engine under cryogenic conditions.
Common cold starting auxiliary device is arranged on the pen type heater plug in the diesel engine cylinder at present, its heating part is arranged between the sparger ejection oil bundle, when cold starting, the air in the cylinder is heated, make oil gas mixed aerosol better effects if in the cylinder, impel diesel engine fire burns.The described controlling method that has the diesel engine cold starting of heater plug is when engine water temperature is lower than threshold value, and control unit output control signal makes heater plug heating certain hour.But such controlling method exists following problem: 1, cross when low when water temperature or barometric pressure, the certain hour even heater plug has generated heat, water temperature or oil gas mix the needs that situation still can not satisfy motor, cause motor under the situation of low temperature, to turn round, easily because of insufficient lubrication causes damage to the piston of motor, cylinder etc., simultaneously because the insufficient tail gas pollution that causes of fuel combustion in the cylinder; 2, external temperature is higher, and heater plug generated heat after a period of time, can satisfy the needs of engine start, but heater plug is so not only wasted energy also continuing heating, and heater plug is damaged.
Summary of the invention
The objective of the invention is to propose a kind of controlling method that has the diesel engine cold starting of heater plug, this controlling method can be regulated the heating time of heater plug automatically according to external environment condition and engine operating condition, when guaranteeing that engine temperature can satisfy the starting needs, can also energy saving, avoid causing heater plug to damage because of temperature cylinder is too high.
The controlling method that has the diesel engine cold starting of heater plug of the present invention, key is that the control unit of motor is gathered atmospheric pressure in starting process, engine water temperature and rotary speed information, and be arranged on the mode of operation of the heater plug of engine air cylinder interior according to the information adjustment that collects, specifically comprise following steps: A: after control unit is received fire signal, if engine water temperature is lower than starting water temperature threshold value, then enter preceding warm-up phase, the preheat time of warm-up phase before control unit is set according to water temperature and atmospheric pressure, and the control heater plug begins heating; If engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug does not generate heat heater plug, perhaps enters the time-out warm-up phase, and control unit control heater plug does not temporarily generate heat heater plug; B: when preceding warm-up phase finishes, if engine speed is lower than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the strengthening preheating stage, control unit control heater plug continues heating; If engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the starting warm-up phase, control unit control heater plug continues heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating; C: when the strengthening preheating stage finishes, if engine speed is lower than the starting speed threshold value, then enter the time-out warm-up phase, control unit control heater plug temporarily stops heating; If engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the starting warm-up phase, control unit control heater plug continues heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating; D: suspending warm-up phase, if engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then entering the starting warm-up phase, control unit control heater plug restarts heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating; E: at the starting warm-up phase, surpassed starting threshold value preheat time if engine water temperature is higher than the preheat time of starting water temperature threshold value or starting warm-up phase, then control unit control heater plug stops heating.
Above-mentioned start-up control method is divided into the heater plug mode of operation in the start-up course following several according to the water temperature and the speed conditions of motor:
1, when water temperature was higher than starting water temperature threshold value, heater plug did not heat, the energy and heater plug is damaged because of the temperature in the cylinder is too high of can avoiding waste like this.
2, when engine speed is higher than starting speed threshold value and water temperature and is lower than starting water temperature threshold value, the heater plug heating, can prevent that like this motor from turning round under the situation of low temperature, because of insufficient lubrication causes damage to the piston of motor, cylinder etc., cause tail gas pollution simultaneously because the fuel combustion in the cylinder is insufficient.
3, when engine speed was lower than starting speed threshold value and water temperature and is lower than starting water temperature threshold value, this controlling method is controlled the heater plug heating again according to specific circumstances or suspended heating, and was specific as follows:
3.1, control unit receive fire signal and before warm-up phase when end, if engine speed is lower than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then heater plug heating, do like this be because control unit receive fire signal and before warm-up phase when end, the driver probably can start car, therefore in order to prevent that motor from turning round, and must heat under the situation of low temperature;
3.2, when the strengthening preheating stage finishes, if engine speed is lower than the starting speed threshold value, then enter the time-out warm-up phase, control unit control heater plug temporarily stops heating, doing like this is because when the strengthening preheating stage finishes, if engine speed still is lower than the starting speed threshold value, just illustrates that the driver temporarily can not start car, therefore need not to continue heating, in order to avoid the electric energy of waste storage battery.
4, when surpassed starting threshold value preheat time the preheat time of starting warm-up phase, no matter whether the water temperature of this moment is higher than starting water temperature threshold value, control unit all will be controlled heater plug and stop heating, be in order to prevent to consume excessively the electric energy of storage battery like this, in order to avoid storage battery is damaged, simultaneously can make storage battery keep some electric energy, heating when starting in order to next time.
In above-mentioned A step, after control unit is received fire signal,, two kinds of processing methods can be arranged if engine water temperature is higher than starting water temperature threshold value, the one, control unit control heater plug does not generate heat heater plug, the electric energy of the storage battery that can avoid waste like this; The 2nd, enter the time-out warm-up phase, control unit control heater plug does not temporarily generate heat heater plug.This processing method is applicable to the situation of stopping and just starting once more soon in cold snap, though this moment, water temperature was higher than starting water temperature threshold value, but the temperature of atmosphere is lower, and water temperature might drop to below the starting water temperature threshold value very soon, it is poor that the interior oil gas of cylinder this moment mixes situation, be not suitable for burning, be easy to generate tail gas pollution, therefore when engine speed improves, water temperature might drop to below the starting water temperature threshold value on the contrary, at this moment the heating of control unit control heater plug can improve the mixed situation of oil gas, reduces and pollutes.
Control unit is according to the preheat time of water temperature and the preceding warm-up phase of atmospheric pressure setting, and water temperature and atmospheric pressure are low more, and the preheat time of preceding warm-up phase is just long more.Control unit is set the preheat time of preceding warm-up phase according to water temperature and atmospheric pressure, this is because when atmospheric pressure is relatively lower, oxygen content in the atmosphere usually also can be on the low side, oxygen content in the mixed oil and gas in the cylinder is more on the low side at this moment, for not influencing the motor proper functioning, the time that needs to heat will be long partially, therefore simultaneously the preheat time of warm-up phase can be more accurate before setting with reference to water temperature and two factors of atmospheric pressure, when guaranteeing to satisfy the engine start needs, reduce unnecessary heating time, improve priming speed.
The preheat time of warm-up phase before control unit obtains by the method for looking into table preheat time, described preheat time, table was the form of relation of the preheat time of predefined reflection water temperature, atmospheric pressure and preceding warm-up phase, different tables preheat time is applicable to the motor of different model, in real work, when method of the present invention is applied to different motors, it is just passable only to need to change table preheat time that is stored in automobile storage unit the inside, and this type that just makes method of the present invention use is more extensive.
The strengthening preheating time in described strengthening preheating stage is predefined fixed value.The strengthening preheating stage is a kind of processing method when engine speed is lower than starting speed threshold value and engine water temperature and is lower than starting water temperature threshold value, in this stage, fixing heating a period of time of heater plug is the strengthening preheating time, be in order to improve the temperature in the cylinder on the one hand, be to wait for that the driver improves engine speed on the other hand, if this section in the period driver fail to improve engine speed, then can be considered to the driver and temporarily not want to start car, therefore can enter the time-out warm-up phase, suspend heating, with the electric energy that avoids waste; If this section in the period driver improved engine speed, then can be considered to the driver and want to start car, so control unit can continue heating or stop heating according to water temperature situation control heater plug, guarantee that motor can not turn round under low temperature condition.Described fixed value will be formulated according to the situation of concrete motor and storage battery, if the strengthening preheating time in strengthening preheating stage is oversize, will waste the electric energy of storage battery, and preheat time is too short, can make the effect of preheating bad again, and preferably both take into account, usually be set to several seconds to tens seconds according to experience, when guaranteeing pre-heat effect, be unlikely to long preheat time like this, waste electric energy, prolongation starting time.
Starting threshold value preheat time of described starting warm-up phase is predefined fixed value.At the starting warm-up phase, the heater plug heating mainly is in order to improve the temperature in the cylinder, improve the mixed situation of oil gas, and then improve combustion position, reduce tail gas pollution, and the heat that motor discharges in combustion process is only the main energy source that improves water temperature, therefore heater plug need not to heat always, it is just passable only the temperature in the cylinder need to be brought up to the degree that is fit to engine combustion, the time threshold of starting warm-up phase is set at fixed value, avoid heater plug when water temperature is low, to continue heating, the electric energy of waste storage battery exactly.The time threshold of starting warm-up phase is preferably set according to the volume of cylinder, the factors such as pressure of atmosphere.
Above-mentioned starting water temperature threshold value and starting speed threshold value need formulate according to the material of concrete motor, the factors such as machine oil of use, guarantee that the running of motor is smooth and easy, avoid because of insufficient lubrication the parts of motor being caused damage.
The controlling method that has the diesel engine cold starting of heater plug of the present invention is followed according to the gentle rotary speed information of engine water, start-up course is divided into preceding preheating, suspend preheating, strengthening preheating, several different stages such as starting preheating, this several stages can switch according to the rotating speed and the water temperature of motor, in each stage, again with reference to engine water temperature, factor such as rotating speed and atmospheric pressure is provided with the mode of operation of heater plug, can be with the adaptive adjustment of the variation of ambient conditions heating time, optimize heats, when satisfying the motor cold starting, reduce the discharging of exhaust emission, energy saving and the working life of improving heater plug.
Description of drawings
Fig. 1 is that embodiment 1 heater plug working stage switches schematic representation;
Fig. 2 is that embodiment 2 heater plug working stage switches schematic representation.
Embodiment
Further describe the controlling method that has the diesel engine cold starting of heater plug of the present invention below in conjunction with drawings and Examples.
Embodiment 1:
As shown in Figure 1, after control unit is received fire signal, read the water temperature of motor, if engine water temperature is lower than starting water temperature threshold value, warm-up phase heats before then entering, if engine water temperature is higher than starting water temperature threshold value, then enter the time-out warm-up phase, temporarily do not heat.
In preceding warm-up phase, control unit is set the preheat time of preceding warm-up phase according to water temperature and atmospheric pressure, and the control heater plug begins heating, in the preheat time that reaches setting, when warm-up phase finishes promptly, if engine speed is lower than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the strengthening preheating stage, continue heating; If engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the starting warm-up phase, continue heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating.
In stage, control unit control heater plug continues heating a period of time at strengthening preheating, and be the fixed value of setting according to the situation of concrete motor and storage battery in advance this heating time.When the strengthening preheating stage finishes, if engine speed is lower than the starting speed threshold value, then enter the time-out warm-up phase, temporarily stop heating; If engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the starting warm-up phase, continue heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating.
Suspending warm-up phase, control unit control heater plug temporarily stops heating, and engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value if control unit detects, and then enters the starting warm-up phase, restarts heating; Engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value if control unit detects, and then control unit control heater plug stops heating.
In the starting warm-up phase, control unit control heater plug continues heating or restarts heating, in this stage heating process, if engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating immediately, and electric energy and damage heater plug avoid waste; If surpassed starting threshold value preheat time heating time; no matter whether water temperature exceeds starting water temperature threshold value so; control unit is all controlled heater plug and is stopped heating; prevent the storage battery over-discharge can; the protection storage battery; it is predefined that described starting threshold value preheat time is that the factors such as pressure of volume, atmosphere according to cylinder are come, and only needs in the real work table look-up and can learn according to atmospheric pressure at that time.
In the present embodiment, control unit is to be converted to logic control amount such as pulse-width signal preheat time to export heater plug to, with the work of control heater plug.
Embodiment 2:
As shown in Figure 2, the present embodiment difference from Example 1 is: after control unit is received fire signal, read the water temperature of motor, if engine water temperature is lower than starting water temperature threshold value, then enter preceding warm-up phase,, then do not enter the time-out warm-up phase if engine water temperature is higher than starting water temperature threshold value, but do not generate heat the electric energy of the storage battery that can avoid waste like this by control unit control heater plug.
The controlling method that has the diesel engine cold starting of heater plug of the present invention is followed according to the gentle rotary speed information of engine water, start-up course is divided into preceding preheating, suspend preheating, strengthening preheating, several different stages such as starting preheating, this several stages can switch according to the rotating speed and the water temperature of motor, in each stage, again with reference to engine water temperature, factor such as rotating speed and atmospheric pressure is provided with the mode of operation of heater plug, can be with the adaptive adjustment of the variation of ambient conditions heating time, optimize heats, when satisfying the motor cold starting, reduce the discharging of exhaust emission, energy saving and the working life of improving heater plug.
Claims (5)
1, a kind of controlling method that has the diesel engine cold starting of heater plug, the control unit that it is characterized in that motor is gathered atmospheric pressure, engine water temperature and rotary speed information in starting process, and be arranged on the mode of operation of the heater plug of engine air cylinder interior according to the information adjustment that collects, specifically comprise following steps:
A: after control unit is received fire signal,, then enter preceding warm-up phase if engine water temperature is lower than starting water temperature threshold value, the preheat time of warm-up phase before control unit is set according to water temperature and atmospheric pressure, and the control heater plug begins heating; If engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug does not generate heat heater plug, perhaps enters the time-out warm-up phase, and control unit control heater plug does not temporarily generate heat heater plug;
B: when preceding warm-up phase finishes, if engine speed is lower than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the strengthening preheating stage, control unit control heater plug continues heating; If engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the starting warm-up phase, control unit control heater plug continues heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating;
C: when the strengthening preheating stage finishes, if engine speed is lower than the starting speed threshold value, then enter the time-out warm-up phase, control unit control heater plug temporarily stops heating; If engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then enter the starting warm-up phase, control unit control heater plug continues heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating;
D: suspending warm-up phase, if engine speed is higher than the starting speed threshold value and engine water temperature is lower than starting water temperature threshold value, then entering the starting warm-up phase, control unit control heater plug restarts heating; If engine speed is higher than the starting speed threshold value and engine water temperature is higher than starting water temperature threshold value, then control unit control heater plug stops heating;
E: at the starting warm-up phase, surpassed starting threshold value preheat time if engine water temperature is higher than the preheat time of starting water temperature threshold value or starting warm-up phase, then control unit control heater plug stops heating.
2, the controlling method of diesel engine cold starting according to claim 1 is characterized in that water temperature and atmospheric pressure are low more, and the preheat time of preceding warm-up phase is long more.
3, the controlling method of diesel engine cold starting according to claim 2, it is characterized in that control unit obtain by the method for looking into preheat time table before preheat time of warm-up phase, described preheat time, table was the form of relation of the preheat time of predefined reflection water temperature, atmospheric pressure and preceding warm-up phase.
4, the controlling method of diesel engine cold starting according to claim 2, the strengthening preheating time that it is characterized in that the described strengthening preheating stage is predefined fixed value.
5, the controlling method of diesel engine cold starting according to claim 2 is characterized in that starting threshold value preheat time of described starting warm-up phase is predefined fixed value.
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| CN200810218479A CN100582473C (en) | 2008-10-20 | 2008-10-20 | Control method of diesel engine with preheating plug for low temperature cold start |
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| CN200810218479A CN100582473C (en) | 2008-10-20 | 2008-10-20 | Control method of diesel engine with preheating plug for low temperature cold start |
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| CN100582473C true CN100582473C (en) | 2010-01-20 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858293B (en) * | 2010-04-30 | 2013-05-08 | 北京协进科技发展有限公司 | Reminder and method for preheating time of cold vehicle startup |
| DE102010038337A1 (en) * | 2010-07-23 | 2012-01-26 | Robert Bosch Gmbh | Method and device for controlling the glow behavior of a glow plug of an internal combustion engine |
| CN102493905A (en) * | 2011-12-15 | 2012-06-13 | 潍柴动力股份有限公司 | Cold-booting auxiliary device for diesel engine and control method |
| CN102720619B (en) * | 2012-06-28 | 2015-09-02 | 潍柴动力扬州柴油机有限责任公司 | A kind of heating means of non-electric control engine and heating system |
| CN104500301A (en) * | 2014-09-29 | 2015-04-08 | 清华大学 | Direct injection compression ignition engine and cold start method thereof |
| CN106285970B (en) * | 2015-05-28 | 2019-01-29 | 长城汽车股份有限公司 | A kind of dual fuel engine control method of cold start |
| CN108204324A (en) * | 2017-12-08 | 2018-06-26 | 中国北方发动机研究所(天津) | A kind of diesel engine plateau cold start pre-heating mean |
| CN109098910A (en) * | 2018-09-07 | 2018-12-28 | 浙江吉利控股集团有限公司 | A kind of auxiliary system starting method and apparatus |
| CN114562401B (en) * | 2021-03-11 | 2024-07-02 | 长城汽车股份有限公司 | Engine preheating time adjusting method and vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4399781A (en) * | 1980-01-31 | 1983-08-23 | Nippondenso Co., Ltd. | Engine preheating control system having automatic control of glow plug current |
| US4566410A (en) * | 1983-07-21 | 1986-01-28 | Mitsubishi Denki Kabushiki Kaisha | Diesel engine glow plug controlling device |
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2008
- 2008-10-20 CN CN200810218479A patent/CN100582473C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4399781A (en) * | 1980-01-31 | 1983-08-23 | Nippondenso Co., Ltd. | Engine preheating control system having automatic control of glow plug current |
| US4566410A (en) * | 1983-07-21 | 1986-01-28 | Mitsubishi Denki Kabushiki Kaisha | Diesel engine glow plug controlling device |
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