CN106884705B - A kind of cooling control method of vehicular petrol engine - Google Patents
A kind of cooling control method of vehicular petrol engine Download PDFInfo
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- CN106884705B CN106884705B CN201710209811.6A CN201710209811A CN106884705B CN 106884705 B CN106884705 B CN 106884705B CN 201710209811 A CN201710209811 A CN 201710209811A CN 106884705 B CN106884705 B CN 106884705B
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- water pump
- type water
- clutch type
- engine
- coolant liquid
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The present invention relates to a kind of cooling control methods of vehicular petrol engine comprising detect the voltage of engine electronic control, the revolving speed of engine, the malfunction of cooling-water temperature transmitter and clutch type water pump malfunction；Judge whether clutch type water pump is allowed to work under the information condition detected；Obtain air-mass flow WintakeAnd the coolant temperature correction factor T of the Current Temperatures of coolant liquid and target temperature differenceb, calculate heat integral coefficient Kb=Wintake×Tb；Judge heat integral coefficient KbWhether the first preset value is greater than；To the heat integral coefficient KbIt carries out time integral and obtains coolant liquid heat integrated value Sb；Judge coolant liquid heat integrated value SbWhether the second preset value is greater 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 reduces.
Description
Technical field
The present invention relates to automobile engine field of electric control, the cooling control of specifically a kind of vehicular petrol engine
Method.
Background technique
Currently, the cooling system of vehicular petrol engine is usually to force liquid-cooled, existed by cooling water pump driving coolant liquid
Circulation in the cooling circuit of engine, to ensure engine operation in suitable temperature.
The crankshaft of engine transmits torque and speed to cooling water pump by belt, operates cooling water pump.With automobile-used
Petrol engine reinforcing degree is gradually increased, and calorific value when running also increases with it.Therefore, design of Cooling System
It accordingly continues to optimize, to meet its huge cooling requirement in heavy-duty service.One of the important means of wherein, it is to increase
The lift and flow of cooling water pump.
For many automobiles, for passenger car, engine is usually operated at running on the lower load and low temperature
Operating condition, its cooling system only needs the coolant rate of very little at this time.Since the crankshaft of conventional engine drives cooling water pump
Mechanical connection is invariable, therefore the water pump of engine is operated with the crankshaft of engine simultaneously forever, and is clearly to start
Machine cooling system is run under the required maximum cooling flow of some revolving speed of engine.
Then, for engine in running on the lower load and worst cold case, self-assembling formation is to coolant rate and crankshaft horsepower
Significant waste, and cause engine temperature relatively low, increase engine friction, burn that bad, exhaust gas temperature is low, and then make to send out
The fuel efficiency and emission level of motivation are deteriorated, especially prominent when environment temperature is lower.
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, so that it is periodically paused to cold when the cooling requirement of engine is smaller
But the driving of water pump.Thus, it is possible to realize the electric control clutch type water pump of above-mentioned function, just come into being.Accordingly, it is desirable to develop
The software controlling strategies adaptable with it.
Summary of the invention
The purpose of the present invention is to provide a kind of cooling control methods of vehicular petrol engine, realize motor petrol
The target that engine fuel efficiency improves and emission level reduces.
Technical scheme is as follows:
A kind of cooling control method of vehicular petrol engine comprising following steps:
Step a, the failure of the voltage of engine electronic control, the revolving speed of engine, cooling-water temperature transmitter is detected
The fault status information of state and clutch type water pump, enters step b.
Step b, whether clutch type water pump is allowed to work under the information condition that judgment step a is detected, if then entering step
Rapid c；Otherwise clutch type water pump continuous running.
Step c, air-mass flow W is obtainedintakeAnd coolant liquid Current Temperatures and target temperature difference and should
The corresponding coolant temperature correction factor T of differenceb, calculate heat integral coefficient Kb=Wintake×Tb, enter step d.
Step d, judge heat integral coefficient KbWhether the first preset value is greater than, if then clutch type water pump continuous running；
Otherwise e is entered step.
Step e, to the heat integral coefficient KbIt carries out time integral and obtains coolant liquid heat integrated value Sb, enter step
f。
Step f, judge coolant liquid heat integrated value SbWhether the second preset value is greater than, if then clutch type water pump operates
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 fSWPPreset by way of linear interpolation
It searches and obtains in pump working timetable.
In further, the Current Temperatures of coolant liquid coolant temperature corresponding with the difference of target temperature in the step c
Correction factor TbIt is searched and is obtained in preset coolant temperature correction factor table by way of linear interpolation.
In further, the duration of runs t of clutch type water pump in the step fSWPWhen less than third preset value, the duration of runs
tSWPValue third preset value.
The present invention has the air-mass flow data that software calculates according to vehicular petrol engine control system, to estimate
Engine body is heated and the heated situation of engine coolant, controls the correct movement of the clutch of clutch type water pump, from
And the operating of clutch type water pump is controlled, drive the power consumption of clutch type water pump to be reduced；Meanwhile the temperature of coolant liquid will
It is more in higher section, improves engine fuel efficiency, especially environment temperature is lower or engine institute
When the vehicle of equipment uses hybrid power assembly；In addition, when engine is in running on the lower load operation, the exhaust gas temperature of engine
Degree will improve, thus so that the exhaust gas catalytic converter of engine is reached earlier and be maintained at efficient operating temperature,
Making the emission level of engine is improved, and harsh domestic and international emission regulation demands are met.The present invention realizes motor petrol hair
The target that motivation fuel efficiency improves and emission level reduces.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the cooling control method of vehicular petrol engine of the present invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
For vehicular petrol engine, the mixed proportion of fuel and air need to keep in a certain range, just can ensure that
The good combustion of fuel, and the thermal discharge of its fuel combustion is also positively correlated with the air-mass flow near-linear of engine.Cause
This, vehicular petrol engine control system requires to survey or calculate the air-mass flow of engine, it is ensured that the supply of its fuel
It can make engine work, and meet the operation requirement of driver.Engine coolant is heated, and the overwhelming majority is from combustion
The burning of material.Therefore, it is possible to use vehicular petrol engine control system has the air-mass flow data that software calculates, come
Estimate the heated situation of engine coolant.
This programme is not only to directly control the operating of clutch type water pump according to the temperature of coolant liquid, but from engine body
Heated and engine coolant heated situation controls the operating of clutch type water pump.Why do not use simple in the prior art
Temperature difference control, and use the more complex algorithm for combining the heated estimation of engine body, be since the thermal inertia of coolant liquid is larger,
And cooling flow needed for engine may not be simple linearly related to the temperature difference, needs using nonlinear flexible control characteristic
Strategy.It is not ideal enough to the realization effect of the adjusting of coolant temperature if only directly controlled according to coolant temperature.
Also there is the control (being to directly control coolant rate) using pump power in the prior art, theoretically, uses
The water pump of stepless continuous adjustable flow can reach ideal cooling control effect.But, on the one hand, stepless continuous is adjustable
Implementation be usually to use motor drive water pump instead, and unconventional dynamo belt driving method, and electric drive is not
Only gross efficiency be already clearly below conventional drive method (engine need to first pass through electrical power generators again feed pump power, energy flow road
Path length, loss are big), also have no advantage (motor, and the mating electrical element for adjustable driving need to be added) in cost.We
Case is by driving water pump to carry out start-up and shut-down control (controlled device is the clutch type water pump that can be shut down) conventional belt, keeping it disconnected
Continuous work and the way for obtaining different equivalent cooling flow, not only increased costs are 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 ball bearing made driving), actual effect is also no less than stepless
Adjust water pump.Therefore, this programme and stepless adjustable water pump is not used, but by carrying out start-up and shut-down control to clutch type water pump, it is real
Now to the control of engine cool flow quantity.
For this purpose, a kind of cooling control method for vehicular petrol engine that this programme provides, referring to Fig. 1 comprising as follows
Step:
Step a, the failure of the voltage of engine electronic control, the revolving speed of engine, cooling-water temperature transmitter is detected
The fault status information of state and clutch type water pump, enters step b.
Step b, whether clutch type water pump is allowed to work under the information condition that judgment step a is detected, if then entering step
Rapid c；Otherwise clutch type water pump continuous running.
Step c, air-mass flow W is obtainedintakeAnd coolant liquid Current Temperatures and target temperature difference and should
The corresponding coolant temperature correction factor T of differenceb, calculate heat integral coefficient Kb=Wintake×Tb, enter step d.
Step d, judge heat integral coefficient KbWhether the first preset value is greater than, if then clutch type water pump continuous running；
Otherwise e is entered step.
Step e, to the heat integral coefficient KbIt carries out time integral and obtains coolant liquid heat integrated value Sb, enter step
f。
Step f, judge coolant liquid heat integrated value SbWhether the second preset value is greater than, if then clutch type water pump operates
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 are usually logical
It crosses existing software in engine electronic control to obtain, the revolving speed of voltage, engine including controller, coolant temperature pass
The information such as the malfunction of sensor and the malfunction of clutch type water pump.
In step b, to the resulting information of step a, the start and stop that clutch type water pump is controlled under engine condition at this time are judged
Whether there is feasibility and necessity.If the voltage of controller does not allow electric control clutch type pump working or described starts
The revolving speed of machine do not allow electric control clutch type pump working perhaps the cooling-water temperature transmitter break down or it is described from
Box-like water pump breaks down, then being impermissible for clutch type water pump stoppage in transit at this time, the engine electronic control is defeated at this time
The instruction of clutch type water pump continuous running out terminates single control flow, to avoid the damage of engine system.Usual state
Under, the start-up and shut-down control of clutch type water pump is allowed, hence into the analysis to engine and the heated situation of coolant liquid
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 recommended method of supplier carries out, and is based partially on engineering common sense, therefore omits and specifically describe.
In step c, the target temperature of the engine coolant is existing soft in the engine electronic control
The data that part calculates, usually regard the hardware state of the engine and different, such as whether the engine is equipped with electronics section temperature
Device.The Current Temperatures of coolant liquid coolant temperature correction factor T corresponding with the difference of target temperature and the differenceb。TbBe with
The relevant coefficient of the temperature difference, is searched in preset coolant temperature correction factor table by way of linear interpolation
It arrives.The WintakeThe value data that existing software calculates in the engine electronic control.
Heat integral coefficient KbThe heating degree of engine, first foundation heat integral coefficient K in step d are substantially reactedb's
Value is made one and is substantially divided, and is to judge heat integral coefficient KbWhether it is greater than the first preset value, the mesh of the first preset value is set
: when the engine needs very big amount of cooling water, if controlling clutch type water pump start and stop at this time, 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 the short time for avoiding clutch type water pump from being frequent, so that clutch type water pump is in continuous running
State.And heat integral coefficient KbLower than the first preset value, the heating degree of engine is relatively low at this time, can further into
Enter the careful judgement of step e.
Step e is heated a quantum chemical method of situation to engine and coolant liquid, although not in a period
Objective and accurate heat branch value can be obtained, but it still has lateral comparison meaning.The coolant liquid heat integrated value S of step fb's
Judgement, is tested by specific experiment, is that second preset value can be arranged as reference value, when coolant liquid heat integrated value
SbReach the second preset value, illustrate the necessity for having operating clutch type water pump at this time, clutch type water pump can be made to operate certain time
tSWPAfter shut down, terminate single control flow.As coolant liquid heat integrated value SbDo not reach the second preset value, sends out at this time
The heated situation of motivation and coolant liquid does not need starting clutch type water pump to radiate, so clutch type water pump is made to stop transporting immediately
Turn, terminates single control flow.
Above-mentioned steps belong to a single control flow, it is thus evident that with continuing working for engine, in software design
Single control flow next time can be entered after a single control flow, it is ensured that timeliness by certain triggering frequency.
To coolant liquid heat integrated value S at the end of single control flowbS of zero setting or every calculatingbShi Gengxin numerical value.Single twice
In control flow, as coolant liquid is heated the variation of situation, most probably there is different process trends, such as last control stream
Journey KbWhen no more than the first preset value, SbWhen no more than the second preset value, clutch type water pump will after shutting down, at least through
Two seconds or more time, SbValue just can be more than the second preset value, just can real-time update S and next time in control flowbValue,
Thus next time in control flow, clutch type water pump just will start heat dissipation.
The operating value request SWP_status of clutch type water pump is set, which is given birth in real time by engine electronic control
At, if the value of SWP_status be numerical value 2, correspond to the instruction of clutch type water pump continuous running at this time；If SWP_status's
When value is numerical value 1, clutch type water pump duration of runs t is corresponded at this timeSWPThe instruction to shut down afterwards；If the value of SWP_status is
When numerical value 0, the instruction that clutch type water pump shuts down is corresponded at this time.
The duration of runs t of clutch type water pump in the step fSWPIn preset pump working by way of linear interpolation
It searches and obtains in timetable.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
When state, extend the duration of runs with the increase of the engine cool amount demand.Meanwhile the tSWPValue can not be set
It is too small: various problems caused by the time for needing to prevent from being maintained at operating condition because of the electric control clutch type water pump is too short, example
Such as described electric control clutch type water pump actually not can enter operating condition, or during the electric control clutch type pump operation, institute
The coolant liquid circular flow for stating engine is smaller than what is expected.A third preset value can be set, when in place between tSWPLess than
When three preset values, duration of runs tSWPValue third preset value.
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
It states the increase of engine cool amount demand and shortens.Meanwhile the TbValue can not be set it is too small, consider 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, the overlong time for needing that clutch type water pump is prevented to be in the state to shut down.For example, by the second preset value divided by
The WintakeCommon minimum value, then divided by the engine allow clutch type water pump shut down maximum duration (such as
180 seconds) T can be obtainedbMinimum value.
Coolant temperature correction factor TbA kind of nonlinear effect may be implemented: (generally showing to cool down when the temperature difference is smaller
Liquid temperature is higher, and heating is than very fast) when, TbValue very big (allow SbRapidly integral increase), be as a result exactly allow water pump interval
The duty ratio of work increases (time of water pump pause operating shortens)；And when the temperature difference is larger, TbValue it is smaller, allow heat product
It point slowly increases and (to allow SbIncreases slowly), pump working interval time can be allowed to extend, can reduce cooling flow.
Since the electronic controller hardware of current conventional vehicular petrol engine and its modular software are highly developed,
Therefore, the software controlling strategies being adapted with electric control clutch type water pump, can be used as Module-embedding and send out to existing motor petrol
In motivation control system, use vehicular petrol engine inside the control system existing logic calculation numerical value as control join
Number.
For matching the vehicular petrol engine 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 higher section, change engine fuel efficiency
It is kind, especially when the vehicle that environment temperature is lower or engine is equipped is using hybrid power assembly.
In addition, the exhaust gas temperature of engine will improve, to make to send out when engine is in running on the lower load operation
The exhaust gas catalytic converter of motivation can reach earlier 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, which comprises the steps of:
Step a, the malfunction of the voltage of engine electronic control, the revolving speed of engine, cooling-water temperature transmitter is detected
With the fault status information of clutch type water pump, b is entered step；
Step b, whether clutch type water pump is allowed to work under the information condition that judgment step a is detected, if then entering step c；
Otherwise clutch type water pump continuous running；
Step c, air-mass flow W is obtainedintakeAnd coolant liquid Current Temperatures and target temperature difference and the difference
Corresponding coolant temperature correction factor Tb, calculate heat integral coefficient Kb=Wintake×Tb, enter step d；
Step d, judge heat integral coefficient KbWhether the first preset value is greater than, if then clutch type water pump continuous running；Otherwise into
Enter step e；
Step e, to the heat integral coefficient KbIt carries out time integral and obtains coolant liquid heat integrated value Sb, enter step f；
Step f, judge coolant liquid heat integrated value SbWhether the second preset value is greater than, if then clutch type water pump duration of runs tSWP
After shut down；Otherwise clutch type water pump shuts down immediately.
2. a kind of cooling control method 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 fSWPIt is searched and is obtained in preset pump working timetable by way of linear interpolation.
3. a kind of cooling control method of vehicular petrol engine according to claim 1 or 2, it is characterised in that: described
The Current Temperatures of coolant liquid and the corresponding coolant temperature correction factor T of the difference of target temperature in step cbPass through linear interpolation
Mode search and obtain in preset coolant temperature correction factor table.
4. a kind of cooling control method 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 fSWPWhen less than third preset value, duration of runs tSWPValue third preset value.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10190478B1 (en) * | 2017-07-25 | 2019-01-29 | GM Global Technology Operations LLC | Controlling a cooling system for an internal combustion engine using feedback linearization |
| 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 |
| CN110375888B (en) * | 2019-07-01 | 2021-04-27 | 中国第一汽车股份有限公司 | Method and apparatus for diagnosing coolant temperature sensor, vehicle, and storage medium |
| 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 |
| 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 |
| 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101099289A (en) * | 2005-01-17 | 2008-01-02 | 丰田自动车株式会社 | Drive system and control method of the same |
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| KR101534695B1 (en) * | 2009-12-04 | 2015-07-08 | 현대자동차 주식회사 | Variable water pump control system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101099289A (en) * | 2005-01-17 | 2008-01-02 | 丰田自动车株式会社 | Drive system and control method of the same |
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