CN113550819A

CN113550819A - Engine warm-up control method and device

Info

Publication number: CN113550819A
Application number: CN202010333235.8A
Authority: CN
Inventors: 段心林; 林承伯; 赵璐璐; 董春艳; 吴广权; 李子清
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-10-26
Anticipated expiration: 2040-04-24
Also published as: CN113550819B

Abstract

The invention discloses a method, a device and a storage medium for controlling engine warm-up, wherein after a vehicle is started, the method comprises the steps of obtaining the current water temperature of an engine and the working state of the engine, and controlling an electronic water pump to execute different warm-up control strategies according to the current water temperature if the current water temperature is less than a warm-up end threshold and the working state of the engine is a normal working state, so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy; according to the method, the actual water temperature condition of the vehicle engine is considered, the electronic water pump is controlled to warm the engine according to the real-time water temperature of the vehicle engine, the flow of the electronic water pump is adjusted by adjusting a warm-up control strategy in the warm-up process of the engine in time according to the water temperature change of the engine, the warm-up time of the engine can be shortened, the rapid warm-up is realized, and the risk of overheating of the engine caused by the fact that the water temperature of the engine is not considered in the delayed zero-flow warm-up process is reduced on the premise of the rapid warm-up.

Description

Engine warm-up control method and device

Technical Field

The invention relates to the technical field of vehicle engine control, in particular to an engine warm-up control method and device.

Background

The role of the engine cooling system is to maintain the engine within a proper temperature range under all operating conditions. After the engine is driven, the water pump of the engine adjusts the temperature of the engine by controlling the flow. The water pump of the engine cooling system of the existing vehicle is provided with a mechanical water pump, a clutch type water pump and an electronic water pump, the power of the mechanical water pump and the clutch type water pump is from the engine, the active regulation of the flow cannot be realized, the electronic water pump provides power through a storage battery, the engine is not required to provide power, the active regulation of the flow can be realized under any working condition of the engine, and different cooling requirements under each working condition of the engine are met.

As the scheme that the whole automobile engine uses the electronic water pump is less in the market, the control strategy of the electronic water pump in the warming-up process is not too many. When a vehicle is started, the electronic water pump generally adopts a zero-flow delay warming-up mode for warming up an engine, namely, in a period of time after the engine is started, the electronic water pump does not control the flow, so that the temperature in the cylinder of the engine is rapidly increased to achieve the warming-up effect, but the zero-flow delay does not consider the actual condition of the vehicle. For example, the water temperature of the engine is different when the vehicle is started, the heat required during warming is different, and in the process of delayed zero-flow warming, the electronic water pump can perform zero-flow warming in the same time regardless of the temperature difference, and when the water temperature is higher, the temperature in the engine cylinder is overhigh, so that the overheating risk is generated.

Disclosure of Invention

The invention provides an engine warm-up control method, an engine warm-up control device and a storage medium, and aims to solve the problem that an electronic water pump is not warmed up according to the actual water temperature of a vehicle engine in the prior art.

An engine warm-up control method comprising:

after a vehicle is started, acquiring the current water temperature of an engine, and acquiring the working state of the engine;

and if the current water temperature is less than a warm-up finishing threshold value and the working state of the engine is a normal working state, controlling the electronic water pump to execute different warm-up control strategies according to the current water temperature so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy.

Further, the controlling the electronic water pump to execute different warming-up control strategies according to the current water temperature includes:

determining a temperature interval where the current water temperature is located according to the current water temperature;

determining a warming control strategy corresponding to the temperature interval where the current water temperature is located;

and controlling the electronic water pump to execute the corresponding warming-up control strategy, and controlling the electronic water pump to stop warming up when the current water temperature is greater than the warming-up finishing threshold value.

Further, after determining the temperature interval of the current water temperature according to the current water temperature, the method further includes:

timing;

and if the timing duration is longer than the preset duration and the temperature interval is unchanged, controlling the electronic water pump to stop warming.

Further, the determining of the warming control strategy corresponding to the temperature interval of the current water temperature includes:

when the current water temperature is in the first interval, determining the corresponding warming control strategy as a first strategy;

when the current water temperature is in the second interval, determining the corresponding warming control strategy as a second strategy;

when the current water temperature is in the third interval, determining that the corresponding warming control strategy is a third strategy;

when the current water temperature is in the fourth interval, determining that the corresponding warming control strategy is a fourth strategy;

when the current water temperature is in the fifth interval, determining that the corresponding warming control strategy is a fifth strategy;

the first policy, and the first policy are all different.

Further, the method comprises:

the starting time lengths of the electronic water pumps in the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy are sequentially increased;

the rotation speeds of the electronic water pump after being started in the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy are sequentially increased;

the closing time of the electronic water pump in the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy is reduced in sequence.

Further, in the third policy, the fourth policy, and the fifth policy, the method further includes:

calibrating the lowest rotating speed of the electronic water pump, wherein the flow of the electronic water pump when the electronic water pump operates at the lowest rotating speed meets the lowest flow demand of the engine;

and after the electronic water pump is started, controlling the electronic water pump to operate at the lowest rotating speed in the closing time of the electronic water pump.

Further, the method further comprises:

when the current water temperature is in the third interval, if the vehicle has no air conditioning and heating demand, determining that the corresponding warming control strategy is the second strategy;

when the current water temperature is in the fourth interval, if the vehicle has no exhaust gas recirculation demand, determining that the corresponding warming control strategy is the third strategy;

and when the current water temperature is in the fifth interval, if the actual load of the engine is greater than the engine load limited by the current rotating speed of the electronic water pump, controlling the electronic water pump to stop warming.

Further, after controlling the electronic water pump to stop warming up, the method further includes:

if the engine stops working and the vehicle is not shut down, obtaining the current water temperature of the engine after the vehicle is restarted;

and if the current water temperature is smaller than a warming-up finishing threshold value, controlling the electronic water pump to execute different warming-up control strategies according to the current water temperature so that the electronic water pump warms up the engine according to the currently executed warming-up control strategy.

An engine warmup control device comprising:

the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the current water temperature of an engine and acquiring the working state of the engine after a vehicle is started;

and the control module is used for controlling the electronic water pump to execute different warming-up control strategies according to the current water temperature if the current water temperature is less than a warming-up finishing threshold and the working state of the engine is a normal working state, so that the electronic water pump warms up the engine according to the currently executed warming-up control strategy.

An engine warm-up control device comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the processor executes the computer program to realize the steps of the engine warm-up control method.

In one scheme implemented by the method, the device and the storage medium for controlling the engine warm-up, after a vehicle is started, the current water temperature of the engine is obtained, the working state of the engine is obtained, and if the current water temperature is smaller than a warm-up finishing threshold value and the working state of the engine is a normal working state, different warm-up control strategies are executed by controlling the electronic water pump according to the current water temperature, so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy; according to the method, the actual water temperature condition of the vehicle engine is considered, the electronic water pump is controlled to warm the engine according to the real-time water temperature of the vehicle engine, the flow of the electronic water pump is adjusted by adjusting a warm-up control strategy in the warm-up process of the engine in time according to the water temperature change of the engine, the warm-up time of the engine can be shortened, the rapid warm-up is realized, and the engine overheating risk caused by delayed zero-flow warm-up due to the fact that the water temperature of the engine is not considered is reduced on the premise of rapid warm-up.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic diagram of an engine warm-up control system according to an embodiment of the present invention;

FIG. 2 is a flowchart illustrating a method for controlling engine warm-up according to an embodiment of the present invention;

FIG. 3 is a flowchart illustrating an implementation of step S30 according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an engine warm-up control apparatus according to an embodiment of the present invention;

fig. 5 is another schematic structural diagram of the engine warmup control apparatus according to the embodiment of the invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The engine warm-up control method provided by the embodiment of the invention can be applied to an engine warm-up control system shown in fig. 1, and the engine warm-up control system comprises an engine 101, an electronic water pump 102 and an engine warm-up control device 103, wherein the engine, the electronic water pump and the engine warm-up control device are communicated through a bus, after a vehicle is started, the engine warm-up control device acquires the current water temperature of the engine and the working state of the engine, and if the current water temperature of the engine is smaller than a warm-up end threshold value and the working state of the engine is a normal working state, the electronic water pump is controlled to execute different warm-up control strategies according to the current water temperature, so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy.

In this embodiment, the engine warm-up control system including the engine, the electronic water pump and the engine warm-up control device is only an exemplary illustration, and in other embodiments, the engine warm-up control system may also include others, which are not described herein again.

In an embodiment, as shown in fig. 2, an engine warm-up control method is provided, which is described by taking the engine warm-up control device in fig. 1 as an example, and includes the following steps:

s10: after the vehicle is started, the current water temperature of the engine is obtained, and the working state of the engine is obtained.

It should be understood that, when a vehicle is started, the existing electronic water pump generally adopts a zero-flow delay warming-up manner for warming up an engine, that is, in a period of time after the engine is started, the electronic water pump does not control the flow, so that the temperature in the engine block is rapidly increased to achieve the warming-up effect, but the zero-flow delay does not take into account the actual situation of the vehicle. For example, the water temperature of the engine is different when the vehicle is started, the heat required during warming is different, and in the process of delayed zero-flow warming, the electronic water pump can perform zero-flow warming in the same time regardless of the temperature difference, and when the water temperature is higher, the temperature in the engine cylinder is overhigh, so that the overheating risk is generated.

In order to solve the problems, the invention provides an engine warm-up control method, after a vehicle is started, an engine warm-up control device acquires the current water temperature and the engine working state of an engine and controls an electronic water pump to execute different warm-up control strategies according to the current water temperature of the engine, so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy.

Therefore, after the vehicle is started, the current water temperature of the engine needs to be acquired, and the working state of the engine needs to be acquired, so that when the current water temperature of the engine is smaller than a warm-up ending threshold value and the working state of the engine is a normal working state, different warm-up control strategies are executed by controlling the electronic water pump according to the current water temperature, and the electronic water pump warms up the engine according to the currently executed warm-up control strategy.

The current water temperature of the engine is obtained through a water temperature sensor, and the working state of the engine can be obtained through an engine controller.

In this embodiment, the current water temperature of the engine is obtained by the water temperature sensor, and the working state of the engine can be obtained by the engine controller, which are only exemplary descriptions.

S20: it is determined whether the current water temperature is less than a warm-up end threshold and the operating state of the engine is a normal operating state.

After the current water temperature of the engine and the working state of the engine are obtained, if the current water temperature is larger than a warming-up finishing threshold value, the temperature of the engine is indicated to be the normal working temperature, and warming-up is not needed, the electronic water pump is controlled to directly enter a normal working mode.

S30: and if the current water temperature is less than the warm-up finishing threshold value and the working state of the engine is a normal working state, controlling the electronic water pump to execute different warm-up control strategies according to the current water temperature so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy.

If the current water temperature is smaller than the warm-up finishing threshold value and the working state of the engine is a normal working state, the vehicle is indicated to enter a warm-up mode, different warm-up control strategies need to be executed by controlling the electronic water pump according to the current water temperature of the engine, and the warm-up control strategy is adjusted according to the change of the water temperature of the engine, so that the flow of the electronic water pump is changed, and the electronic water pump warms up the engine according to the currently executed warm-up control strategy. When the water temperature of the engine exceeds a warm-up finishing threshold value, the water temperature of the engine reaches a normal working value, and the electronic water pump is controlled to exit a warm-up mode and enter a normal working mode.

It should be understood that the water pump of the engine cooling system of the existing vehicle has a mechanical water pump, a clutch type water pump and an electronic water pump, and the power of the mechanical water pump and the clutch type water pump comes from the engine, and the active regulation of the flow cannot be realized.

In this embodiment, based on electronic water pump's warm-up control strategy, can distinguish the current temperature of engine under the condition that need not newly-increased water temperature sensor, customize the warm-up control strategy to the temperature rise process of engine different stages, can improve the warm-up speed of strategy engine under the prerequisite that satisfies each functional demand.

In the embodiment, after a vehicle is started, by acquiring the current water temperature of an engine and the working state of the engine, if the current water temperature is less than a warm-up end threshold and the working state of the engine is a normal working state, the electronic water pump is controlled to execute different warm-up control strategies according to the current water temperature, so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy; according to the method, the actual water temperature condition of the vehicle engine is considered, the electronic water pump is controlled to warm the engine according to the real-time water temperature of the vehicle engine, the flow of the electronic water pump is adjusted by adjusting a warm-up control strategy in the warm-up process of the engine in time according to the water temperature change of the engine, the warm-up time of the engine can be shortened, the rapid warm-up is realized, and the engine overheating risk caused by delayed zero-flow warm-up due to the fact that the water temperature of the engine is not considered is reduced on the premise of rapid warm-up.

In an embodiment, as shown in fig. 3, in step S30, controlling the electronic water pump to execute different warming-up control strategies according to the current water temperature specifically includes the following steps:

s31: and determining the temperature interval of the current water temperature according to the current water temperature.

After the current water temperature of the engine and the working state of the engine are obtained, the temperature interval in which the current water temperature of the engine is located is determined according to the current water temperature of the engine.

For example, before determining the temperature interval in which the current water temperature is located according to the current water temperature, the division according to the water temperature of the engine which is frequently generated in the engine warming process in the past needs to be preselected, the temperature below the warming end threshold is divided into a plurality of temperature intervals, and each temperature interval corresponds to one warming control strategy.

S32: and determining a warming control strategy corresponding to the temperature interval where the current water temperature is.

After the temperature interval where the current water temperature of the engine is located is determined according to the current water temperature of the engine, a warming control strategy corresponding to the temperature interval where the current water temperature of the engine is located is determined, different warming control strategies are executed in different temperature intervals, the warming control strategy is customized according to the temperature rise processes of different stages of the engine, the change condition of the water temperature of the engine is fully considered, the warming control strategy is timely adjusted according to the change of the water temperature of the engine, and the risk of overheating of the engine is reduced.

S33: and controlling the electronic water pump to execute a corresponding warming-up control strategy, and controlling the electronic water pump to stop warming up when the current water temperature is greater than a warming-up finishing threshold value.

And after determining a warming-up control strategy corresponding to the temperature interval where the current water temperature is located, controlling the electronic water pump to execute the corresponding warming-up control strategy, and controlling the electronic water pump to stop warming up when the current water temperature is greater than a warming-up end threshold value.

In the embodiment, the temperature interval where the current water temperature is located is determined according to the current water temperature, the warming control strategy corresponding to the temperature interval where the current water temperature is located is determined, the electronic water pump is controlled to execute the corresponding warming control strategy, the electronic water pump is controlled to stop warming when the current water temperature is larger than the warming finishing threshold value, the current water temperature of the engine is partitioned under the condition that a new water temperature sensor is not needed, different warming control strategies are executed in different temperature intervals, warming control strategy customization is carried out in the temperature rising process of the engine at different stages, the change condition of the water temperature of the engine is fully considered, the warming control strategy is timely adjusted according to the water temperature change of the engine, the risk of overheating of the engine is reduced, the oil consumption is saved, and the engine warming speed is increased.

In an embodiment, after the step S31, that is, after determining the temperature interval of the current water temperature according to the current water temperature, the method further includes the following steps:

s311: and (6) timing.

After the temperature interval of the current water temperature is determined according to the current water temperature, timing needs to be started to determine the time length for maintaining the water temperature of the engine in a certain temperature interval.

S312: and if the timing duration is longer than the preset duration and the temperature interval is unchanged, controlling the electronic water pump to stop warming.

And if the timing duration is longer than the preset duration and the temperature interval is unchanged, controlling the electronic water pump to stop warming. The preset duration is the duration corresponding to a certain temperature interval, and the duration is the duration that the water temperature of the engine is maintained in the certain temperature interval, that is, when the duration that the water temperature of the engine is maintained in the certain temperature interval is greater than the corresponding preset duration, the electronic water pump needs to be controlled to stop warming, and the electronic water pump exits from the warming mode.

In the process of warming up the engine, if the external environment temperature is lower sometimes and the water temperature of the engine may be warmed up to a higher temperature, a thermal balance condition may occur at this time, so a corresponding maintaining time length needs to be preset for each temperature interval, after the maintaining time length is exceeded, the electronic water pump needs to be controlled to stop warming up so as to avoid that the maintaining time length of the water temperature of the engine in each temperature interval is too long and the electronic water pump does useless work, so the maintaining time length of each temperature interval needs to be timed, and when the timed time length exceeds a time threshold value corresponding to the temperature interval, the electronic water pump is forced to exit from the warming-up mode, so that the electronic water pump is prevented from being started and stopped too much, and the service life of the electronic water pump is prolonged.

For example, if the temperature range of the water temperature of the engine has 5 temperature ranges, and the 5 temperature ranges are the first range, the second range, the third range, the fourth range and the fifth range, respectively, the 5 temperature ranges correspond to 5 preset maintaining time periods, and the maintaining time periods corresponding to the first range, the second range, the third range, the fourth range and the fifth range are t_tr1、t_tr2、t_tr3、t_tr4And t_tr5I.e. the water temperature of the engine is maintained in the first interval for a period of time not exceeding t_tr1The time period for which the water temperature of the engine is maintained in the fifth interval cannot exceed t_tr5。

In this embodiment, 5 temperature intervals of the temperature intervals in which the water temperature of the engine is located are only exemplary, and in other embodiments, the number of the temperature intervals in which the water temperature of the engine is located may have other values, which are not described herein again.

In this embodiment, after the temperature interval in which the current water temperature is located is determined according to the current water temperature, the maintenance time of each temperature interval is determined by timing, when the maintenance time of each temperature interval is longer than the corresponding preset time, the electronic water pump needs to be controlled to stop warming, and the warming mode is exited, so that the situation that the maintenance time of the water temperature of the engine in each temperature interval is too long and the electronic water pump does useless work is avoided, the electronic water pump is prevented from being started and stopped too much, and the service life of the electronic water pump is prolonged.

In an embodiment, the temperature interval in which the current water temperature is located includes five consecutive temperature intervals, namely a first interval, a second interval, a third interval, a fourth interval and a fifth interval, and in step S32, the method for determining the warming control strategy corresponding to the temperature interval in which the current water temperature is located specifically includes the following steps:

s321: and when the current water temperature is in a first interval, determining that the corresponding warming control strategy is a first strategy.

S322: and when the current water temperature is in a second interval, determining that the corresponding warming control strategy is a second strategy.

S323: when the current water temperature is in a third interval, determining that the corresponding warming control strategy is a third strategy;

s324: and when the current water temperature is in a fourth interval, determining that the corresponding warming control strategy is a fourth strategy.

S325: and when the current water temperature is in a fifth interval, determining that the corresponding warming control strategy is a fifth strategy.

The first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy are different.

Dividing a temperature interval in which the current water temperature of the engine is located into 5 intervals: the warming-up device comprises a first section, a second section, a third section, a fourth section and a fifth section, wherein the highest temperature of the first section is TR1, the range of the second section is (TR1, TR 2), the range of the third section is (TR2, TR 3), the range of the fourth section is (TR4, TR 5), the lowest temperature of the range of the fifth section is TR5, and TR5 is a warming-up ending threshold value.

For example, TR1 is 0 ℃, TR2 is 55 ℃, TR3 is 75 ℃, TR4 is 85 ℃, TR5 is 92 ℃, wherein 0 ℃ is used as a boundary for quick cooling in a cold region, 55 ℃ is used as a boundary for starting responding to a warm air demand, 75 ℃ is used as a safety boundary set for avoiding EGR condensation of exhaust gas circulation, 85 ℃ is used as a boundary for avoiding the occurrence of a rapid acceleration condition in a warming process to cause overheating of a cylinder cover, and 92 ℃ is used as a boundary for ending a warming mode.

In this embodiment, TR1 is 0 ℃, TR2 is 55 ℃, TR3 is 75 ℃, TR4 is 85 ℃, and TR5 is 92 ℃ are only exemplary, in other embodiments, TR1, TR2, TR3, TR4, and TR5 may be at other temperatures, and are not described herein again.

In one embodiment, the first policy, the second policy, the third policy, the fourth policy, and the fifth policy are different, including:

a. the starting time lengths of the electronic water pumps in the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy are sequentially increased.

b. The rotating speed of the electronic water pump after being started in the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy is sequentially increased.

c. And the closing time of the electronic water pump in the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy is reduced in sequence. Wherein the rotating speed of the electronic water pump is 0 when the electronic water pump is closed,

the engine warming control strategy is realized by controlling the opening and closing (ON-OFF mode) of the electronic water pump, namely, in each temperature interval, the engine is warmed up through the process of cyclic opening and closing, no flow passes when the electronic water pump is closed, water in the engine cannot flow for heat exchange, so that the engine is rapidly heated, and when the electronic water pump is opened, hot water in an engine cylinder is pumped out and cold water is pumped into the engine cylinder, so that the engine is cooled. Therefore, the flow is controlled by controlling the opening time of the electronic water pump, the rotating speed of the electronic water pump after the electronic water pump is opened and the closing time of the electronic water pump, so that the engine is warmed up, namely in the process of warming up the engine, the electronic water pump is controlled to be opened and work for a period of time at the preset rotating speed, and then the electronic water pump is controlled to be completely closed and closed for a period of time, wherein the electronic water pump does not work when being closed, the rotating speed of the electronic water pump is 0, and the warming up of the engine in different temperature intervals is realized by controlling the opening time, the rotating speed after the electronic water pump is opened and the closing time.

In the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy, the opening time of the electronic water pump is sequentially increased, the rotating speed of the electronic water pump after the electronic water pump is opened is sequentially increased, and the closing time of the electronic water pump is sequentially decreased, wherein the rotating speed of the electronic water pump when the electronic water pump is closed is 0, so that the flow of the electronic water pump is gradually increased according to the current water temperature of the engine in the warming-up process of the engine, the temperature of the engine is rapidly and controllably increased in the temperature rising process, and the risk of overheating of the engine is reduced.

In one embodiment, in the process of adjusting the warm-up control strategy according to the current water temperature of the engine to control the electronic water pump to warm up, when the water temperature of the engine is high, the electronic water pump is not controlled to perform a closing action, but after the electronic water pump is controlled to be started and operated at a preset rotation speed for a period of time, the electronic water pump is controlled to reduce the rotation speed so that the electronic water pump is in low-speed inert operation, so as to adjust the position of the electronic water pump to a position capable of meeting the minimum flow demand of the engine, namely in the third strategy, the fourth strategy and the fifth strategy, the method further includes:

s01: and calibrating the lowest rotating speed of the electronic water pump, wherein the flow of the electronic water pump running at the lowest rotating speed meets the lowest flow requirement of the engine.

S02: and after the electronic water pump is started, controlling the electronic water pump to operate at the lowest rotating speed in the closing time of the electronic water pump.

In this embodiment, in the process of adjusting the warming-up control strategy to control the electronic water pump to warm up according to the current water temperature of the engine, when the water temperature of the engine is high, the electronic water pump is not controlled to execute the closing action, but the electronic water pump is controlled to be opened and work at a preset rotating speed for a period of time, and then the rotating speed of the electronic water pump is controlled to be reduced so that the electronic water pump performs low-speed inert work, so that the position of the electronic water pump is adjusted to the position capable of meeting the minimum flow demand of the engine, the risk of overheating of the engine can be further reduced, and the temperature of the engine in the temperature rising process can be accurately controlled.

In one embodiment, other requirements of the vehicle may be considered when the water temperature of the engine is high, where the warm-up control strategy needs to meet the other requirements, the other requirements of the vehicle including air-conditioning warm air requirements and exhaust gas recirculation requirements, and the method further comprises:

s03: and when the current water temperature of the engine is in the third interval, if the vehicle has no air-conditioning warm air demand, determining that the corresponding warm-up control strategy is the second strategy.

S04: and when the current water temperature of the engine is in the fourth interval, if the vehicle has no exhaust gas recirculation demand, determining that the corresponding warming-up control strategy is the third strategy.

S05: and when the current water temperature of the engine is in a fifth interval, if the actual load of the engine is greater than the engine load limited by the current rotating speed of the electronic water pump, controlling the electronic water pump to stop warming.

In this embodiment, through when the temperature of the water at the engine is higher, consider other demands of vehicle, make other demands of vehicle such as warm-air demand of warm air of air conditioner and exhaust gas recirculation demand satisfied by warm-up control strategy, under the basis of quick warm-up, further promoted user and used car experience.

It should be noted that, in this embodiment, the start time of the electronic water pump, the rotation speed of the electronic water pump after being started, the inert operation time of the electronic water pump, and the rotation speed of the electronic water pump after inert operation are respectively calibrated as a set of parameters Ton, AGon, Toff, and AGoff, where the inert operation time of the electronic water pump includes the stop time of the electronic water pump and the operation time of the electronic water pump for reducing the rotation speed, and the rotation speed of the electronic water pump after inert operation includes the rotation speed of the electronic water pump after being stopped and the rotation speed of the electronic water pump after reducing the rotation speed.

When the current water temperature of the engine is lower than TR1, the current water temperature of the engine is in a first interval, the temperature of the engine is too low at this moment, the air-conditioning warm air requirement and the Exhaust Gas Recirculation (EGR) requirement need to be ignored, the EGR function can be forcibly closed, a first group of parameters Ton1, AGon1, Toff1 and AGoff1 are updated to the electronic water pump to control the electronic water pump to execute a first strategy, the first group of parameters can be relatively excited to adapt to the cold region requirement, the opening duration Ton1 of the electronic water pump is short in each cycle, the rotating speed AGon1 after the electronic water pump is opened is small, the closing duration Toff1 of the electronic water pump is long, the rotating speed when the electronic water pump is closed is 0, and the electronic water pump can be adjusted to a full-closed position; the electronic water pump is controlled to implement a first strategy, which will, each time it is turned on, circulate only a small amount of flow to ensure that the engine is not overheated, while locking up as much heat as possible inside the engine to speed up warm-up.

When the current water temperature of the engine is higher than TR1 but lower than TR2, the current water temperature of the engine is in a second interval, the air-conditioning warm air demand and the EGR demand are continuously ignored, a second group of parameters Ton2, AGon2, Toff2 and AGoff2 are updated to the electronic water pump to control the electronic water pump to execute a second strategy, the second group of parameters are mainly used for adapting to the quick warm-up at the normal temperature, compared with the first group of parameters for the cold region, the requirements can be properly relaxed, namely, in each cycle, the opening time Ton2 of the electronic water pump is slightly longer, the rotating speed Agon2 after the electronic water pump is opened is slightly larger, the closing time Toff2 of the electronic water pump is shorter, the rotating speed when the electronic water pump is closed is 0, the electronic water pump can be adjusted to a fully closed position, the opening time and the rotating speed after the electronic water pump is opened are increased to enable the flow to be increased, the temperature rise of the whole engine is properly controlled while the effect of the quick warm-up is realized, so as to avoid the rapid overheating of the whole engine.

When the current water temperature of the engine is higher than TR2 but lower than TR3, the current water temperature of the engine is in the third interval, and it needs to be considered to respond to the function demand from the air-conditioning warm air, and in the first interval and the second interval, because the water temperature is too low, the effective warm air cannot be obtained even if the air conditioner is turned on, and when the water temperature exceeds TR2, the air-conditioning warm air function is turned on. At the moment, if the air conditioner is not required to be warmed, the rapid warming is still taken as the first purpose, and the second group of parameters are kept unchanged; and if the air-conditioning warm air is required, updating a third group of parameters Ton3, Agon3, Toff3 and AGoff3 to the electronic water pump to control the electronic water pump to execute a third strategy, wherein in each cycle of the third strategy, the opening time Ton3 and the rotating speed Agon3 after the electronic water pump is opened need to be increased, and enough flow needs to be ensured to be provided by the electronic water pump so that the air-conditioning warm air can solve the defrosting problem, at the moment, the electronic water pump can be not set to a fully-closed position, namely the electronic water pump is not closed but is reduced in rotating speed to carry out low-speed inert work, the inert work time duration Toff3 is short, and the rotating speed AGoff3 after the rotating speed of the electronic water pump is reduced is the calibrated lowest rotating speed so as to ensure that the flow of the electronic water pump when the electronic water pump is operated at the lowest rotating speed to meet the minimum flow demand of the engine.

When the current water temperature of the engine is higher than TR3 but lower than TR4, the current water temperature of the engine is in a second interval, and the EGR requirement also needs to be considered at the moment, because the condensation phenomenon easily occurs in the process of introducing high-temperature exhaust gas into the cylinder for combustion again, and the condensation is related to the ambient temperature, so the interval is mainly used for solving the condensation problem; if no EGR is needed, the fast warm-up is still taken as the first purpose, the third group of parameters is maintained, if the EGR is needed, the limitation of the EGR function is released, and the fourth group of parameters Ton4, AGon4, Toff4 and AGoff4 are updated to the electronic water pump to control the electronic water pump to execute the fourth strategy, wherein the rotating speed AGon4 and the opening duration Ton4 of the electronic water pump after each opening need to be capable of ensuring that the electronic water pump provides enough flow to meet the EGR requirement, at this time, the electronic water pump can not be set to a fully-closed position, namely the electronic water pump is not closed but is reduced to carry out low-speed inert operation, the inert operation duration Toff4 is short, and the rotating speed AGoff4 of the electronic water pump after the rotating speed is reduced is the calibrated lowest rotating speed, so as to ensure that the flow of the electronic water pump when the electronic water pump is operated at the lowest rotating speed meets the minimum flow requirement of the engine. Wherein, TR3 is different from other temperature thresholds, and needs to be set as a two-dimensional table separately, TR3 is related to the ambient temperature Tamb, and the setting principle is as follows: when the ambient temperature is low, the threshold TR3 needs to be raised appropriately to delay the timing of EGR usage.

When the current water temperature of the engine is higher than TR4 but lower than TR5, the current water temperature of the engine is in a second interval, at the moment, the water temperature is already increased to a certain level, and the risk is possibly caused by the excessive temperature rise, so that the condition that individual points in a cylinder are overheated needs to be considered, in the interval, any working condition that an accelerator is deeply stepped on, such as accelerated overtaking or low-speed climbing, and the like, causes the actual load of the engine to be larger than the engine load limited by the current rotating speed of the electronic water pump, the electronic water pump is controlled to stop warming, and the electronic water pump exits from the warming mode and enters a normal adjustment mode; if the actual load of the engine is not larger than the engine load limited by the current rotating speed of the electronic water pump, a fifth group of relatively conservative parameters Ton5, AGon5, Toff5 and AGoff5 are updated to the electronic water pump to control the electronic water pump to execute a fifth strategy, in each cycle, the opening time Ton5 of the electronic water pump is longer, the opening rotating speed AGon5 is larger, the inert working time duration Toff5 of each time is shorter, the electronic water pump is not set to be a fully-closed position, the rotating speed AGoff4 of the electronic water pump after the rotating speed is reduced is a calibrated lowest rotating speed, so that the flow of the electronic water pump when the electronic water pump runs at the lowest rotating speed meets the lowest flow demand of the engine, the flow of a main loop of the electronic pump is increased, and the temperature rise of the whole machine is properly controlled while the effect of quick warm-up is ensured to avoid quick overheating of the whole machine.

And when the current water temperature of the engine is higher than TR5, finishing the quick warm-up process, controlling the electronic water pump to stop warm-up, and exiting the warm-up mode.

In this embodiment, other requirements of the vehicle, including the air conditioning and heating requirements and the exhaust gas recirculation requirements, are only exemplary, and in other embodiments, other requirements of the vehicle include others, which are not described herein.

In this embodiment, the process of engine warm-up is divided into a plurality of intervals according to the current temperature of engine, set for the control parameter who accords with its demand for every interval, under the prerequisite of the quick warm-up of preferential realization, the overheated risk of complete machine has been considered simultaneously, and the function demand of a plurality of branch roads, the process of engine warm-up can be accelerated by a wide margin, let the temperature, the oil temperature, the wall temperature rises to the best region in the short time, thereby effectively reduce whole car emission, and realize that the engine complete machine rubs down, the effect of oil consumption falls, when cold district, can also effectively solve the problem of machine oil dilution.

In one embodiment, before step S10, i.e. before the current water temperature of the engine is obtained, the method further comprises:

s101: and determining whether the electronic water pump is normal.

After the whole vehicle is powered on, the electronic water pump starts to perform self-checking so as to determine whether the electronic water pump is normal or not.

For example, when the brushless dc motor is started, after the stator and the rotor enter the open-loop control at the aligned phase and before the stator and the rotor enter the closed-loop control, the rotation speed of the electronic water pump is increased, and the current of the electronic water pump is detected at the same time to see whether the current in the electronic water pump can be increased correspondingly according to the rotation speed, and if the current in the electronic water pump is increased correspondingly and reaches the preset threshold, it is determined that the rotation speed of the electronic water pump is normal; if the current under the corresponding rotating speed does not reach the preset threshold value, the load of the electronic water pump is insufficient, the cooling liquid may leak light or the air in the system is not completely discharged, and certain risks exist: the electronic water pump controller is burnt due to overhigh temperature, and the engine is not cooled sufficiently.

In this embodiment, determining whether the electronic water pump is normal or not in a self-checking manner of the electronic water pump is only an exemplary illustration, and in other embodiments, determining whether the electronic water pump is normal or not may be performed in other manners, which is not described herein again.

S102: and if the electronic water pump is abnormal, performing abnormal alarm on the electronic water pump, limiting the torque of the engine, and adjusting the input flow of the electronic water pump to be minimum.

If the electronic water pump is abnormal, an electronic water pump abnormal alarm is carried out to prompt a user, and the water temperature of an engine is not high and the risk is not large when the whole vehicle is electrified, so that the input signal to the electronic water pump requires that the input flow of the electronic water pump is adjusted to be minimum at the moment, the electronic water pump only provides the minimum flow so that the engine cannot be burnt, the possible cooling circulation can be guaranteed to the minimum extent, meanwhile, the engine is required to be limited in torque and limited in speed, the heating is reduced, the whole vehicle has the vehicle moving capacity, and the protection effect on all components is achieved.

S103: and if the electronic water pump is normal, determining whether the water temperature sensor has a fault.

After the electronic water pump carries out self-checking, if the electronic water pump is determined to be normal, whether the water temperature sensor is in fault or not is judged.

S104: and if the water temperature sensor fails, performing fault alarm on the water temperature sensor, and adjusting the input flow of the electronic water pump to the maximum value so as to meet the cooling requirement of the engine.

If the water temperature sensor fails, a water temperature sensor failure alarm is carried out to prompt a user, and the input flow of the electronic water pump is adjusted to be maximum so as to meet the cooling requirement of the engine and avoid overheating of the engine.

In the embodiment, before the current water temperature of the engine is obtained, whether the electronic water pump is normal or not is determined, if the electronic water pump is abnormal, abnormal alarm of the electronic water pump is carried out, the engine is limited, the input flow of the electronic water pump is adjusted to be minimum, the electronic water pump only provides minimum flow so that the engine cannot be burnt, possible cooling circulation can be guaranteed to the minimum extent, meanwhile, the heat of the engine can be reduced, the whole vehicle can be moved, and the effect of protecting all components is achieved; and if the electronic water pump is normal, determining whether the water temperature sensor fails, if so, performing fault alarm on the water temperature sensor, and adjusting the input flow of the electronic water pump to the maximum value so as to meet the cooling requirement of the engine, so that a user can know the water temperature sensor failure in time and prevent the engine from overheating.

In one embodiment, the engine has a plurality of water temperature sensors, and in step S10, the current water temperature of the engine is obtained, and the method specifically includes the following steps:

s11: and simultaneously acquiring water temperature values corresponding to the water temperature sensors.

S12: and taking the maximum water temperature value in the water temperature values corresponding to the water temperature sensors as the current water temperature of the engine.

In the engine, the temperatures of all places are different, and in the process of re-warming, the maximum water temperature value in the water temperature values measured simultaneously by the water temperature sensors needs to be used as the current water temperature of the engine, so that the temperature interval is confirmed according to the maximum water temperature value to execute a warming control strategy, and the overheating risk caused by uneven heating of all parts of the engine is avoided.

For example, two water temperature sensors are arranged in an engine cylinder body of a vehicle engine, wherein one water temperature sensor is arranged on an engine cylinder cover, the temperatures of the engine cylinder body and the engine cylinder cover are different due to the different positions of the engine cylinder body and the engine cylinder cover, and at the same moment, if the temperature of the cylinder cover is higher, the temperature of the cylinder cover is used as the current water temperature of the engine, so that a warming-up control strategy is executed by confirming a temperature interval according to the maximum water temperature value in the following process, and the overheating risk caused by uneven heating of all parts of the engine is avoided.

In this embodiment, if the engine has a plurality of water temperature sensors, the water temperature values corresponding to the plurality of water temperature sensors are simultaneously obtained, and the maximum water temperature value among the water temperature values corresponding to the plurality of water temperature sensors is used as the current water temperature of the engine, so that the warm-up control strategy is executed by subsequently confirming the temperature interval according to the maximum water temperature value, thereby avoiding the overheating risk caused by uneven heating of each part of the engine.

In one embodiment, during the warming-up process of the engine, temperature limits are set for a plurality of water temperature sensors of the engine, if the temperature detected by one of the water temperature sensors exceeds the set temperature, the electronic water pump is controlled to stop warming-up and exit the warming-up mode no matter what the temperatures detected by other temperature sensors are, so as to avoid overheating of the engine and simplify the warming-up process.

In an embodiment, after controlling the electronic water pump to stop warming up, the method specifically further includes the following steps:

s41: it is determined whether the engine is stopped and the vehicle is shut down.

S42: and if the engine stops working and the vehicle does not shut down, acquiring the current water temperature of the engine after the vehicle is restarted.

After the electronic water pump is controlled to stop warming up, if the engine stops working, the rotation speed of the engine is detected to be 0, the vehicle is not shut down, and whether warming up is needed or not needs to be determined according to the water temperature of the engine after the vehicle is started again, so that the current water temperature of the engine is obtained after the vehicle is started again.

S43: and if the current water temperature is smaller than a warming-up finishing threshold value, controlling the electronic water pump to execute different warming-up control strategies according to the current water temperature so that the electronic water pump warms up the engine according to the currently executed warming-up control strategy.

For example, after controlling the electronic water pump to stop warming up, the flag Bwu is set to indicate that the warm-up mode is already in the warm-up mode, and the normal water temperature control process is entered, and the warm-up mode is not repeatedly entered until the next stop. However, due to the reasons of vehicle start-stop or hybrid strategy and the like, the condition that the engine speed n is 0 but the whole vehicle is not turned off electrically is caused, the current water temperature of the engine needs to be acquired after the vehicle is started for the second time, and if the current water temperature of the engine is smaller than a warming-up end threshold TR5, the flag bit Bwu is modified, and the vehicle enters a warming-up mode again; if the current water temperature of the engine is greater than or equal to the warm-up end threshold TR5, the flag Bwu is kept unchanged, and the warm-up mode is not entered until the vehicle is stopped, shut down, and restarted.

In this embodiment, after the electronic water pump is controlled to stop the warming-up, whether the engine stops working and the vehicle stalls is determined, if the engine stops working and the vehicle stalls, the current water temperature of the engine is obtained after the vehicle restarts, if the current water temperature is smaller than a warming-up end threshold, different warming-up control strategies are executed by controlling the electronic water pump according to the current water temperature, so that the electronic water pump warms up the engine according to the currently executed warming-up control strategy, loss of the engine due to repeated entering of the engine due to too low water temperature into a warming-up process is reduced, and meanwhile, when a special condition occurs, the engine is reheated, and oil consumption of the engine is reduced.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

In one embodiment, an engine warmup control device is provided, which corresponds one-to-one to the engine warmup control method in the above embodiment. As shown in FIG. 4, the engine warm-up control apparatus includes an acquisition module 401 and a control module 402. The functional modules are explained in detail as follows:

the system comprises an acquisition module 401, a control module and a control module, wherein the acquisition module is used for acquiring the current water temperature of an engine and acquiring the working state of the engine after a vehicle is started;

and the control module 402 is configured to, if the current water temperature is less than a warm-up end threshold and the working state of the engine is a normal working state, control the electronic water pump to execute different warm-up control strategies according to the current water temperature, so that the electronic water pump warms up the engine according to the currently executed warm-up control strategy.

Wherein the control module 402 is specifically configured to:

Wherein the control module 402 is further specifically configured to:

timing;

The temperature intervals in which the current water temperature is located include five consecutive temperature intervals, namely a first interval, a second interval, a third interval, a fourth interval and a fifth interval, and the control module 402 is specifically configured to:

the first policy, the second policy, the third policy, the fourth policy, and the fifth policy are all different.

The starting time of the electronic water pump in the first strategy, the second strategy, the third strategy, the fourth strategy and the fifth strategy is increased in sequence;

Wherein, in the third strategy, the fourth strategy, and the fifth strategy, the control module 402 is further specifically configured to:

Wherein the control module 402 is further specifically configured to:

Before the current water temperature of the engine is obtained, the obtaining module 401 is further specifically configured to:

determining whether the electronic water pump is normal;

if the electronic water pump is abnormal, performing abnormal alarm on the electronic water pump, limiting the torque of the engine, and adjusting the input flow of the electronic water pump to be minimum;

if the electronic water pump is normal, determining whether the water temperature sensor fails;

and if the water temperature sensor fails, performing fault alarm on the water temperature sensor, and adjusting the input flow of the electronic water pump to the maximum value so as to meet the cooling requirement of the engine.

Wherein the engine has a plurality of water temperature sensors, the acquisition module 401 is further specifically configured to:

simultaneously acquiring water temperature values corresponding to the plurality of water temperature sensors;

and taking the maximum water temperature value in the water temperature values corresponding to the water temperature sensors as the current water temperature of the engine.

After controlling the electronic water pump to stop warming up, the control module 402 is further specifically configured to:

For specific limitations of the engine warmup control device, reference may be made to the above limitations of the engine warmup control method, which will not be described herein again. The modules in the engine heater control device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

In one embodiment, an engine warm-up control apparatus is provided that includes a processor, a memory, connected by a system bus. Wherein, the processor of the engine warm-up control device is used for providing calculation and control capability. The memory of the engine warm-up control device includes a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The computer program is executed by a processor to implement an engine warm-up control method.

In one embodiment, as shown in fig. 5, there is provided an engine warm-up control apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:

In one embodiment, a readable storage medium is provided, having stored thereon a computer program which, when executed by a processor, performs the steps of:

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. An engine warm-up control method characterized by comprising:

2. A method for controlling engine warmup according to claim 1, wherein said controlling the electric water pump to execute different warmup control strategies based on the current water temperature includes:

3. A method of controlling engine warm-up as set forth in claim 2, wherein after said determining a temperature zone in which the current water temperature is based on the current water temperature, the method further comprises:

timing;

4. A method for controlling engine warm-up as claimed in claim 3, wherein the temperature intervals in which the current water temperature is located include five consecutive temperature intervals of a first interval, a second interval, a third interval, a fourth interval and a fifth interval, and the determining of the warm-up control strategy corresponding to the temperature interval in which the current water temperature is located includes:

5. An engine warmup control method as set forth in claim 4, characterized by comprising:

6. A method of controlling engine warmup as set forth in claim 5, further comprising, in the third strategy, the fourth strategy, and the fifth strategy:

7. A method of controlling engine warmup as set forth in claim 6, further comprising:

8. A method of controlling engine warm-up according to any one of claims 1 to 7, characterized in that after controlling the electric water pump to stop warm-up, the method further includes:

9. An engine warm-up control device characterized by comprising:

10. An engine warmup control apparatus comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the engine warmup control method according to any one of claims 1 to 8 when executing the computer program.