CN106884705A - A kind of cooling control method of vehicular petrol engine - Google Patents
A kind of cooling control method of vehicular petrol engine Download PDFInfo
- Publication number
- CN106884705A CN106884705A CN201710209811.6A CN201710209811A CN106884705A CN 106884705 A CN106884705 A CN 106884705A CN 201710209811 A CN201710209811 A CN 201710209811A CN 106884705 A CN106884705 A CN 106884705A
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- Prior art keywords
- water pump
- type water
- clutch type
- coolant
- engine
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2050/00—Applications
- F01P2050/22—Motor-cars
Abstract
The present invention relates to a kind of cooling control method of vehicular petrol engine, the malfunction of its voltage, the rotating speed of engine, the malfunction of cooling-water temperature transmitter and clutch type water pump for including detecting engine electronic control；Whether clutch type water pump is allowed to work under the information condition that judgement is detected；Obtain air-mass flow WintakeAnd the coolant temperature correction factor T of the Current Temperatures of coolant and target temperature differenceb, calculate heat integral coefficient Kb=Wintake×Tb；Judge heat integral coefficient KbWhether the first preset value is more than；To the heat integral coefficient KbCarry out time integral and obtain coolant heat integrated value Sb；Judge coolant heat integrated value SbWhether the second preset value is more than, if then clutch type water pump duration of runs tSWPAfter shut down；Otherwise clutch type water pump shuts down immediately.This programme realizes the target that vehicular petrol engine fuel efficiency improves and emission level is reduced.
Description
Technical field
The present invention relates to automobile engine field of electric control, the cooling of specifically a kind of vehicular petrol engine is controlled
Method.
Background technology
At present, the cooling system of vehicular petrol engine is usually pressure liquid-cooled, drives coolant to exist by cooling water pump
The cooling circuit interior circulation of engine, to ensure that engine is operated in suitable temperature.
The bent axle of engine, to cooling water pump transmitting torque and speed, operates cooling water pump by belt.With automobile-used
Petrol engine reinforcing degree is gradually stepped up, and caloric value during its operation also increases therewith.Therefore, its design of Cooling System
Accordingly continue to optimize, to meet its huge cooling requirement in heavy-duty service.One of important means therein, is increase
The lift and flow of cooling water pump.
For many automobiles, for passenger car, its engine is usually operated at running on the lower load and low temperature
Operating mode, now its cooling system only need to the coolant rate of very little.Because the bent axle of conventional engine drives cooling water pump
Mechanical connection is invariable, therefore the water pump of engine is operated simultaneously with the bent axle of engine forever, and is clearly to start
Machine cooling system runs under the engine required maximum cooling flow of certain rotating speed.
Then, in running on the lower load and worst cold case, self-assembling formation is to coolant rate and crankshaft horsepower for engine
Notable waste, and cause engine temperature relatively low, increase engine friction, the bad, EGT that burns it is low, and then make hair
The fuel efficiency of motivation is deteriorated with emission level, especially prominent when environment temperature is relatively low.
Be to solve above-mentioned contradiction, more simple, economic way a kind of at present is, by cooling water pump and engine crankshaft it
Between mechanical connection be designed as it is detachable, when the cooling requirement of engine is smaller, it to be periodically paused to cold
But the driving of water pump.Thus, it is possible to realize the electric control clutch type water pump of above-mentioned functions, just arise at the historic moment.Accordingly, it is desirable to develop
The software controlling strategies adaptable with it.
The content of the invention
It is an object of the invention to provide a kind of cooling control method of vehicular petrol engine, it realizes motor petrol
The target that engine fuel efficiency improves and emission level is reduced.
Technical scheme is as follows：
A kind of cooling control method of vehicular petrol engine, it comprises the following steps：
Voltage, the rotating speed of engine, the failure of cooling-water temperature transmitter of step a, detection engine electronic control
The fault status information of state and clutch type water pump, into step b.
Step b, judge whether allow clutch type water pump to work under the information condition that step a is detected, if then entering step
Rapid c；Otherwise clutch type water pump continuous running.
Step c, acquisition air-mass flow WintakeAnd the Current Temperatures of coolant and target temperature difference and should
The corresponding coolant temperature correction factor T of differenceb, calculate heat integral coefficient Kb=Wintake×Tb, into step d.
Step d, judge heat integral coefficient KbWhether the first preset value is more than, if then clutch type water pump continuous running；
Otherwise enter step e.
Step e, to the heat integral coefficient KbCarry out time integral and obtain coolant heat integrated value Sb, into step
f。
Step f, judge coolant heat integrated value SbWhether the second preset value is more than, if then clutch type water pump is operated
Between tSWPAfter shut down；Otherwise clutch type water pump shuts down immediately.
In further, the duration of runs t of clutch type water pump in the step fSWPDefault by way of linear interpolation
Searched in pump working timetable and obtained.
In further, the difference T of the Current Temperatures of coolant and target temperature in the step cbAfter temperature adjustmemt
Value, it is searched in default coolant temperature correction factor table by way of linear interpolation and obtained.
In further, the duration of runs t of clutch type water pump in the step fSWPDuring less than three preset values, the duration of runs
tSWPThe preset value of value the 3rd.
The present invention estimates according to the air-mass flow data that the existing software of vehicular petrol engine control system is calculated
Engine body be heated and engine coolant situation of being heated, control clutch type water pump clutch correct operation, from
And to control the operating of clutch type water pump, drive the power consumption of clutch type water pump to be reduced；Meanwhile, the temperature of coolant will
Interval higher is more in, is improved engine fuel efficiency, particularly environment temperature is relatively low or engine institute
When the vehicle of equipment uses hybrid power assembly；In addition, when engine runs in running on the lower load, the waste gas temperature of engine
Degree is possible to improve, so that the exhaust gas catalytic converter of engine can earlier reach and be maintained at efficient operating temperature,
Making the emission level of engine is improved, and meets harsh domestic and international emission regulation demands.The present invention realizes that motor petrol is sent out
The target that motivation fuel efficiency improves and emission level is reduced.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the cooling control method of vehicular petrol engine of the invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
For vehicular petrol engine, its fuel need to keep within the specific limits, just can ensure that with the mixed proportion of air
The good combustion of fuel, and its fuel combustion thermal discharge also with the air-mass flow near-linear positive correlation of engine.Cause
This, vehicular petrol engine control system is required for surveying or calculating the air-mass flow of engine, it is ensured that its fuel is supplied
Engine work can be made, and meet the operation requirement of driver.Being heated for engine coolant, it is most from combustion
The burning of material.Therefore, it is possible to use the air-mass flow data that the existing software of vehicular petrol engine control system is calculated, come
Estimate the situation of being heated of engine coolant.
This programme not only directly controls the operating of clutch type water pump according to the temperature of coolant, but from engine body
It is heated and engine coolant is heated situation to control the operating of clutch type water pump.Why do not use simple in the prior art
Temperature difference control, and use and be heated the relatively complicated algorithm of estimation with reference to engine body, be because the thermal inertia of coolant is larger,
And the cooling flow needed for engine may not be linear to the temperature difference related, it is necessary to use nonlinear flexible control characteristic merely
Strategy.If be only directly controlled according to coolant temperature, effect is not ideal enough to be realized to the regulation of coolant temperature.
Also have in the prior art using the control (being directly to control coolant rate) of pump power, in theory, use
The water pump of stepless continuous adjustable flow, can reach ideal cooling control effect.But, on the one hand, stepless continuous are adjustable
Implementation be typically to use instead motor-driven water pump, and unconventional dynamo belt type of drive, and motorized motions are not
Only gross efficiency is already clearly below conventional drive method (engine need to first pass through electrical power generators, and feed pump is powered again, energy flow road
Path length, loss is big), also have no advantage (motor need to be set up, and for the mating electrical element of adjustable driving) on cost.We
Case carries out start-up and shut-down control (controlled device be can shut down clutch type water pump), it is broken by driving to conventional belt water pump
Continuous work and obtain the way of different equivalent cooling flow, not only cost increases less (need to only increase inside water pump pulley
Electric control clutch device assembly, without changing engine wheel system arrangement, it is only necessary to which ball bearing made drives), actual effect is also no less than stepless
Regulation water pump.Therefore, this programme does not use stepless adjustable water pump, but carries out start-up and shut-down control by clutch type water pump, real
Now to the control of engine cool flow quantity.
Therefore, a kind of cooling control method of vehicular petrol engine that this programme is provided, referring to Fig. 1, it includes as follows
Step：
Voltage, the rotating speed of engine, the failure of cooling-water temperature transmitter of step a, detection engine electronic control
The fault status information of state and clutch type water pump, into step b.
Step b, judge whether allow clutch type water pump to work under the information condition that step a is detected, if then entering step
Rapid c；Otherwise clutch type water pump continuous running.
Step c, acquisition air-mass flow WintakeAnd the Current Temperatures of coolant and target temperature difference and should
The corresponding coolant temperature correction factor T of differenceb, calculate heat integral coefficient Kb=Wintake×Tb, into step d.
Step d, judge heat integral coefficient KbWhether the first preset value is more than, if then clutch type water pump continuous running；
Otherwise enter step e.
Step e, to the heat integral coefficient KbCarry out time integral and obtain coolant heat integrated value Sb, into step
f。
Step f, judge coolant heat integrated value SbWhether the second preset value is more than, if then clutch type water pump is operated
Between tSWPAfter shut down；Otherwise clutch type water pump shuts down immediately.
In above-mentioned steps a detection be related to engine whether normal operating condition information, these information generally lead to
Existing software in engine electronic control is crossed to obtain, including the voltage of controller, the rotating speed of engine, coolant temperature are passed
The information such as the malfunction of sensor and the malfunction of clutch type water pump.
In step b, to the information obtained by step a, judge under engine condition now, control the start and stop of clutch type water pump
Whether there is feasibility and necessity.If the voltage of controller does not allow electric control clutch type pump working, or described starts
The rotating speed of machine does not allow electric control clutch type pump working, or the cooling-water temperature transmitter breaks down, or it is described from
Box-like water pump breaks down, then be now impermissible for clutch type water pump stoppage in transit, now the engine electronic control is defeated
Go out the instruction of clutch type water pump continuous running, terminate single control flow, to avoid the damage of engine system.Usual state
Under, it is allowed for during the start-up and shut-down control of clutch type water pump, hence into the analysis to engine and the situation of being heated of coolant
Journey, turns to step c.The fault detection method of the cooling-water temperature transmitter and the electric control clutch type water pump, can be according to it
The recommendation method of supplier is carried out, and is based partially on engineering general knowledge, therefore omits specific descriptions.
In step c, the target temperature of the engine coolant is from existing soft in the engine electronic control
The data that part is calculated, generally different regarding the hardware state of the engine, such as whether described engine is equipped with electronics section temperature
Device.The Current Temperatures of coolant coolant temperature correction factor T corresponding with the difference of target temperature and the differenceb。TbBe with
A related coefficient of the temperature difference, it is searched by way of linear interpolation in default coolant temperature correction factor table
Arrive.The WintakeThe data that are calculated from existing software in the engine electronic control of value.
Heat integral coefficient KbThe heating degree of engine is substantially reacted, first according to heat integral coefficient K in step db's
Value is made one and is substantially divided, and is to judge heat integral coefficient KbWhether it is more than the first preset value, the mesh of the first preset value is set
Be：When the engine needs very big amount of cooling water, if now controlling clutch type water pump start and stop, clutch type water pump can only suspend
The very short time even there's almost no the time of pause, at this time control the effect that clutch type water pump start and stop have not had, because
And it is the unnecessary stopping for avoiding clutch type water pump from the frequently short time occur, clutch type water pump is in continuous running
State.And heat integral coefficient KbLess than the first preset value, now the heating degree of engine is relatively low, can further enter
Enter the careful judgements of step e.
Step e is a quantum chemical method of situation of being heated to engine and coolant, although it is not in a time period
Objective and accurate heat branch value can be obtained, but it still has lateral comparison meaning.The coolant heat integrated value S of step fb's
Judge, tested by specific experiment, be that can set second preset value to be used as reference value, when coolant heat integrated value
SbThe second preset value is reached, illustrates now there is necessity of operating clutch type water pump, clutch type water pump can be made to operate certain hour
tSWPAfter shut down, terminate single control flow.As coolant heat integrated value SbThe second preset value is not reaching to, is now sent out
The situation of being heated of motivation and coolant need not start clutch type water pump to radiate, so clutch type water pump is stopped fortune immediately
Turn, terminate single control flow.
Above-mentioned steps belong to a single control flow, it is thus evident that with the continuous firing of engine, in Software for Design
Single control flow next time can be entered after a single control flow terminates, it is ensured that ageing by certain triggering frequency.
To coolant heat integrated value S at the end of single control flowbZero setting often calculates a SbShi Gengxin numerical value.Single twice
In control flow, as coolant is heated the change of situation, most probably there are different flows trends, such as last controlling stream
Journey KbDuring no more than the first preset value, SbDuring no more than the second preset value, clutch type water pump will after shutting down, at least through
The time of more than two seconds, SbValue just can be more than the second preset value, and next time in control flow, just can real-time update SbValue,
Thus next time in control flow, clutch type water pump can just start radiating.
The operating value request SWP_status of clutch type water pump is set, and the value request is given birth in real time by engine electronic control
Into, if the value of SWP_status is numerical value 2, the now instruction of corresponding clutch type water pump continuous running；If SWP_status's
It is worth during for numerical value 1, now corresponds to clutch type water pump duration of runs tSWPThe instruction for shutting down afterwards；If the value of SWP_status is
During numerical value 0, the instruction that clutch type water pump shuts down now is corresponded to.
The duration of runs t of clutch type water pump in the step fSWPIn default pump working by way of linear interpolation
Searched in timetable and obtained.In pump working timetable, the tSWPValue be typically set at the engine coolant
Current Temperatures subtract the increase of the difference of target temperature and increase, to ensure that the electric control clutch type water pump is being not in stopping shape
During state, the duration of runs is extended with the increase of the engine cool amount demand.Meanwhile, the tSWPValue can not be set
It is too small：Needs prevent the various problems caused because the time that the electric control clutch type water pump is maintained at operating condition is too short, example
Electric control clutch type water pump is actual as described fails to enter operating condition, or during the electric control clutch type pump operation, institute
The coolant circular flow for stating engine is smaller than what is be expected.One the 3rd preset value can be set, when in place between tSWPLess than
During three preset values, duration of runs tSWPThe preset value of value the 3rd.
In the coolant temperature correction factor table, the TbValue be typically set at the engine coolant
Current Temperatures subtract the increase of the difference of target temperature and increase, to ensure the time out of service of the clutch type water pump with institute
State the increase of engine cool amount demand and shorten.Meanwhile, the TbValue can not be set it is too small, it is considered to automobile engine
The complexity of actual condition, the inhomogeneities in car engine cooling system temperature field, the deviation of software algorithm and system peace
Congruent factor is, it is necessary to prevent clutch type water pump to be in the overlong time of the state for shutting down.For example, by the second preset value divided by
The WintakeCommon minimum value, then allow the maximum duration that shuts down of clutch type water pump (for example divided by the engine
180 seconds) it is that can obtain the TbMinimum value.
Coolant temperature correction factor TbA kind of nonlinear effect can be realized：(typically show cooling when the temperature difference is smaller
Liquid temperature degree is higher, heats up than very fast) when, TbValue very big (allow SbRapid integration increase), as a result it is exactly to allow water pump intermittently
The dutycycle of work is increased (time of water pump pause operating shortens)；And when the temperature difference is larger, TbValue it is smaller, allow heat to accumulate
Point slow rising (allows SbIncreases slowly), pump working interval time can be allowed to extend, cooling flow can be reduced.
Because the electronic controller hardware and its modular software of current routine vehicular petrol engine are highly developed,
Therefore, the software controlling strategies being adapted with electric control clutch type water pump, can send out as Module-embedding to existing motor petrol
In motivation control system, the numerical value using the existing logical calculated in vehicular petrol engine control system inside is joined as control
Number.
For supporting the use the vehicular petrol engine for being equipped with electric control clutch type water pump of the invention, it is used to drive water
The power consumption of pump will be reduced, and coolant temperature will be more in interval higher, be changed engine fuel efficiency
It is kind, particularly when the vehicle that environment temperature is relatively low or engine is equipped uses hybrid power assembly.
In addition, when engine runs in running on the lower load, the EGT of engine is possible to improve, so that hair
The exhaust gas catalytic converter of motivation can earlier reach and be maintained at efficient operating temperature, obtain the emission level of engine
Improve, to meet harsh domestic and international emission regulation demands.
Claims (4)
1. a kind of cooling control method of vehicular petrol engine, it is characterised in that comprise the following steps：
Voltage, the rotating speed of engine, the malfunction of cooling-water temperature transmitter of step a, detection engine electronic control
With the fault status information of clutch type water pump, into step b；
Step b, judge whether allow clutch type water pump to work under the information condition that step a is detected, if then entering step c；
Otherwise clutch type water pump continuous running；
Step c, acquisition air-mass flow WintakeAnd the difference and the difference of the Current Temperatures of coolant and target temperature
Corresponding coolant temperature correction factor Tb, calculate heat integral coefficient Kb=Wintake×Tb, into step d；
Step d, judge heat integral coefficient KbWhether the first preset value is more than, if then clutch type water pump continuous running；Otherwise enter
Enter step e；
Step e, to the heat integral coefficient KbCarry out time integral and obtain coolant heat integrated value Sb, into step f；
Step f, judge coolant heat integrated value SbWhether the second preset value is more than, if then clutch type water pump duration of runs tSWP
After shut down；Otherwise clutch type water pump shuts down immediately.
2. the cooling control method of a kind of vehicular petrol engine according to claim 1, it is characterised in that：The step
The duration of runs t of clutch type water pump in fSWPSearched in default pump working timetable by way of linear interpolation and obtained.
3. the cooling control method of a kind of vehicular petrol engine according to claim 1 and 2, it is characterised in that：It is described
The difference T of the Current Temperatures of coolant and target temperature in step cbIt is the value after temperature adjustmemt, its side for passing through linear interpolation
Formula is searched in default coolant temperature correction factor table and obtained.
4. the cooling control method of a kind of vehicular petrol engine according to claim 3, it is characterised in that：The step
The duration of runs t of clutch type water pump in fSWPDuring less than three preset values, duration of runs tSWPThe preset value of value the 3rd.
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| CN201710209811.6A CN106884705B (en) | 2017-03-31 | 2017-03-31 | A kind of cooling control method of vehicular petrol engine |
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| CN201710209811.6A CN106884705B (en) | 2017-03-31 | 2017-03-31 | A kind of cooling control method of vehicular petrol engine |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296440A (en) * | 2017-07-25 | 2019-02-01 | 通用汽车环球科技运作有限责任公司 | Use modified feedback linearization control internal-combustion engine cooling system |
| CN110375888A (en) * | 2019-07-01 | 2019-10-25 | 中国第一汽车股份有限公司 | Diagnostic method, device, vehicle and the storage medium of cooling-water temperature transmitter |
| CN110739902A (en) * | 2018-07-20 | 2020-01-31 | 郑州宇通客车股份有限公司 | motor temperature sensor fault processing method and device |
| CN112594051A (en) * | 2020-12-10 | 2021-04-02 | 潍柴重机股份有限公司 | Control method and control system for temperature of high-temperature cooling water of diesel engine |
| CN114635782A (en) * | 2022-03-28 | 2022-06-17 | 东风商用车有限公司 | Troubleshooting method, troubleshooting device, troubleshooting equipment and readable storage medium |
| CN115773174A (en) * | 2022-11-26 | 2023-03-10 | 重庆长安汽车股份有限公司 | Control method and system for electronic water pump of engine |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109296440A (en) * | 2017-07-25 | 2019-02-01 | 通用汽车环球科技运作有限责任公司 | Use modified feedback linearization control internal-combustion engine cooling system |
| CN109296440B (en) * | 2017-07-25 | 2020-12-01 | 通用汽车环球科技运作有限责任公司 | Control of internal combustion engine cooling system using feedback linearization |
| CN110739902A (en) * | 2018-07-20 | 2020-01-31 | 郑州宇通客车股份有限公司 | motor temperature sensor fault processing method and device |
| CN110739902B (en) * | 2018-07-20 | 2021-08-06 | 郑州宇通客车股份有限公司 | Motor temperature sensor fault processing method and device |
| CN110375888A (en) * | 2019-07-01 | 2019-10-25 | 中国第一汽车股份有限公司 | Diagnostic method, device, vehicle and the storage medium of cooling-water temperature transmitter |
| CN112594051A (en) * | 2020-12-10 | 2021-04-02 | 潍柴重机股份有限公司 | Control method and control system for temperature of high-temperature cooling water of diesel engine |
| CN112594051B (en) * | 2020-12-10 | 2021-12-21 | 潍柴重机股份有限公司 | Control method and control system for temperature of high-temperature cooling water of diesel engine |
| CN114635782A (en) * | 2022-03-28 | 2022-06-17 | 东风商用车有限公司 | Troubleshooting method, troubleshooting device, troubleshooting equipment and readable storage medium |
| CN114635782B (en) * | 2022-03-28 | 2023-02-03 | 东风商用车有限公司 | Troubleshooting method of vehicle cooling system and related equipment |
| CN115773174A (en) * | 2022-11-26 | 2023-03-10 | 重庆长安汽车股份有限公司 | Control method and system for electronic water pump of engine |
| CN115773174B (en) * | 2022-11-26 | 2024-03-29 | 重庆长安汽车股份有限公司 | Control method and system of electronic water pump of engine |
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