CN109519287B - Engine idling control method and system and vehicle - Google Patents
Engine idling control method and system and vehicle Download PDFInfo
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- CN109519287B CN109519287B CN201710851509.0A CN201710851509A CN109519287B CN 109519287 B CN109519287 B CN 109519287B CN 201710851509 A CN201710851509 A CN 201710851509A CN 109519287 B CN109519287 B CN 109519287B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/08—Introducing corrections for particular operating conditions for idling
- F02D41/083—Introducing corrections for particular operating conditions for idling taking into account engine load variation, e.g. air-conditionning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/501—Vehicle speed
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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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention provides an engine idling control method, an engine idling control system and a vehicle. According to the invention, on the premise of ensuring the temperature in the vehicle and the comfort of passengers, the idle speed increasing amount of the engine is gradually reduced rather than gradually increased, and the fuel saving is realized on the premise of ensuring the comfort. The magnetic field duty ratio is used as a standard for judging the idle speed control of the engine, so that the power consumption requirement of the whole vehicle can be more accurately reflected, the idle oil consumption is accurately controlled, and the purpose of reducing the idle oil consumption is achieved.
Description
Technical Field
The invention belongs to the technical field of energy conservation and engine idling, and particularly relates to an engine idling control method and system and a vehicle.
Background
Along with the consumption of petroleum resources and the increasing importance of energy-saving technology of vehicles, the engine is used as a main energy consumption device of the vehicle, and the improvement of the working performance of the engine directly influences the economic performance of the vehicle. At present, when an air conditioner is used in a vehicle, the idling speed of an engine is generally directly increased, and the increase of the idling speed of the engine directly causes the increase of energy consumption, so that when the air conditioner is started, the energy consumption of the vehicle can be reduced by reasonably controlling the rotating speed of the engine.
The idle state refers to an operating condition in which the engine is idling. In actual life, the phenomenon of flameout occurs when the engine is stopped temporarily (for example, when the vehicle is stopped at a red light, the vehicle turns and decelerates) due to too low idle speed; if the idling speed of the engine is too high, the fuel consumption is increased, the working temperature of the engine is increased, the abrasion of the engine is accelerated, and large impact occurs during speed changing and gear shifting, so that the automobile is greatly damaged. Therefore, the idle speed must be adjusted to a proper range to ensure smooth operation of the vehicle and to extend the operating life of the engine.
For example, in chinese patent publication No. CN104895688A entitled "method and system for controlling idle speed of passenger car engine", when the engine is in idle state, the generated voltage or generated current of the generator is detected in real time by the meter bus system, and compared with the charging voltage of the battery or the total current required by each electric device by the microprocessor, so as to determine whether the idle speed of the engine is too high or too low. The microprocessor transmits the instruction to the engine ECU through the CAN bus, and the engine ECU adjusts the idling speed of the engine correspondingly. This patent can carry out real-time adjustment to engine idle speed, makes engine idle speed be in suitable state under the prerequisite of guaranteeing the whole power supply volume of passenger train. However, the patent only adjusts the rotation speed of the engine at idle according to the judgment condition, and does not consider whether the temperature in the vehicle affects the comfort of passengers.
In addition, the current electric quantity and the voltage/current of the generator are used as main judgment standards for judging whether to increase the idling speed of the engine, and the current electric quantity and the voltage/current of the generator cannot correctly reflect the real working state of the generator and the requirement change of the whole vehicle due to the fact that the whole working process of the generator is in a transient working condition.
Disclosure of Invention
The invention aims to provide an engine idle speed control method, an engine idle speed control system and a vehicle, which are used for solving the problem of how to save oil on the premise of ensuring the comfort of passengers.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an engine idle speed control method comprising the steps of:
1) judging whether the air-conditioning compressor is started or not, judging whether the current vehicle speed is less than a set vehicle speed value or not, and if the air-conditioning compressor is started and the current vehicle speed is less than the set vehicle speed value, controlling the idling speed of the engine to be a first set value;
2) and judging whether the temperature in the vehicle is less than a temperature set value or not, and if so, controlling the idle speed of the engine to be reduced.
Further, the idling speed of the engine is gradually reduced, and the idling speed of the engine is gradually reduced by comparing the magnitude relation between the magnetic field duty ratio of the generator and the set value of the magnetic field duty ratio.
Further, if the magnetic field duty ratio of the generator is smaller than the set magnetic field duty ratio, the idling speed of the engine is controlled to be reduced to a second set value, and if the magnetic field duty ratio of the generator is larger than or equal to the set magnetic field duty ratio, the idling speed of the engine is controlled to be a first set value.
Further, if the magnetic field duty ratio of the generator is still smaller than the set value of the magnetic field duty ratio, the idling speed of the engine is controlled to be reduced to a third set value, and if the magnetic field duty ratio of the generator is still larger than or equal to the set value of the magnetic field duty ratio, the idling speed of the engine is controlled to be at a second set value.
Further, if the magnetic field duty ratio of the generator is still smaller than the set value of the magnetic field duty ratio, the idling speed of the engine is controlled to be reduced to a fourth set value, and if the magnetic field duty ratio of the generator is still larger than or equal to the set value of the magnetic field duty ratio, the idling speed of the engine is controlled to be at a third set value.
Further, when the idle speed of the engine is controlled to be the first set value, the second set value, the third set value and the fourth set value, the engine needs to be continuously operated for a set time according to the corresponding idle speed.
The invention also provides an engine idle speed control system, which comprises an acquisition module and a controller, wherein the acquisition module is connected with the controller;
the system comprises an acquisition module, a controller, an engine, a compressor, a vehicle speed setting value and a vehicle speed setting value, wherein the acquisition module is used for acquiring the vehicle speed, the state of the compressor and the temperature in the vehicle, the controller is used for judging whether an air conditioner compressor is started and judging whether the current vehicle speed is less than the set value of the vehicle speed, and if the air conditioner compressor is started and the current vehicle speed is less than the set value, the engine is controlled to idle at the first set value; and judging whether the temperature in the vehicle is less than a temperature set value or not, and controlling the idle speed of the engine to be reduced if the temperature in the vehicle is less than the temperature set value.
Further, the idling speed of the engine is gradually reduced, and the idling speed of the engine is gradually reduced by comparing the magnitude relation between the magnetic field duty ratio of the generator and the set value of the magnetic field duty ratio.
Further, if the magnetic field duty ratio of the generator is smaller than the set magnetic field duty ratio, the idling speed of the engine is controlled to be reduced to a second set value, and if the magnetic field duty ratio of the generator is larger than or equal to the set magnetic field duty ratio, the idling speed of the engine is controlled to be a first set value.
The invention also provides a vehicle, which comprises an engine idle speed control system, wherein the engine idle speed control system comprises an acquisition module and a controller, and the acquisition module is connected with the controller;
the system comprises an acquisition module, a controller, an engine, a compressor, a vehicle speed setting value and a vehicle speed setting value, wherein the acquisition module is used for acquiring the vehicle speed, the state of the compressor and the temperature in the vehicle, the controller is used for judging whether an air conditioner compressor is started and judging whether the current vehicle speed is less than the set value of the vehicle speed, and if the air conditioner compressor is started and the current vehicle speed is less than the set value, the engine is controlled to idle at the first set value; and judging whether the temperature in the vehicle is less than a temperature set value or not, and controlling the idle speed of the engine to be reduced if the temperature in the vehicle is less than the temperature set value.
The invention has the beneficial effects that:
the method controls the idling speed of the engine to be a first set value under the condition that the air conditioner compressor is started and the vehicle speed meets the set value, and then controls the idling speed of the engine to be reduced when the temperature in the vehicle is lower than the set temperature value. According to the invention, on the premise of ensuring the temperature in the vehicle and the comfort of passengers, the idle speed increasing amount of the engine is gradually reduced rather than gradually increased, and the fuel saving is realized on the premise of ensuring the comfort.
Furthermore, the magnetic field duty ratio is used as a standard for judging the idle speed control of the engine, so that the power consumption requirement of the whole vehicle can be more accurately reflected, the accurate control of idle oil consumption is realized, and the purpose of reducing the idle oil consumption is achieved.
Drawings
FIG. 1 is a block diagram of an idle speed control system for an air conditioning engine of a vehicle;
FIG. 2 is a flow chart of the control logic for idling the air conditioning engine of a vehicle.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
an engine idle speed control system is shown in fig. 1 and comprises an operation data acquisition module, an air conditioner data acquisition module, a generator data acquisition module, a controller and an execution module, wherein the operation data acquisition module, the air conditioner data acquisition module, the generator data acquisition module and the execution module are connected with a whole vehicle controller. The vehicle control system comprises an operation data acquisition module, an air conditioner data acquisition module, a generator data acquisition module, a vehicle generator control execution mechanism and a control signal control execution mechanism, wherein the operation data acquisition module acquires relevant data of vehicle operation in real time, such as vehicle speed and the like, the air conditioner data acquisition module acquires vehicle air conditioner operation information in real time, such as temperature in a vehicle, state of an air conditioner compressor and the like, the generator data acquisition module acquires vehicle generator operation data in real time, such as magnetic field duty ratio and the like, and the vehicle control execution mechanism outputs a control signal to control the idle speed of an engine according to a control strategy formulated in advance by acquiring the information. Through real-time monitoring, when the air conditioner operates for the first time, the temperature in the vehicle is preferentially ensured to be within the acceptable range of passengers, and the idling of the engine is controlled to operate at a proper rotating speed by combining data such as the magnetic field duty ratio of the generator, the temperature in the vehicle and the like, so that the aim of reducing the fuel of the whole vehicle under the idling condition of the air conditioner is fulfilled.
The method for controlling the idle speed of the engine in the embodiment includes the steps of firstly, judging whether an air conditioner compressor is started or not, judging whether the current vehicle speed is less than a set vehicle speed value or not, and if the air conditioner compressor is started and the current vehicle speed is less than the set vehicle speed value, controlling the idle speed of the engine to be a first set value (corresponding to D revolutions per minute described below); and judging whether the temperature in the vehicle is less than a set temperature value or not, and if so, controlling the idling speed of the engine to gradually decrease. As shown in fig. 2, the specific steps are:
acquiring the current vehicle speed and the state of an air conditioner compressor according to an operation data acquisition module and an air conditioner data acquisition module;
judging whether the air conditioner compressor is started or not, judging whether the vehicle speed is less than or equal to Akm/h or not, if both are satisfied, executing the step three, otherwise, ending;
thirdly, controlling the idling speed of the engine to be D revolutions per minute and maintaining for E minutes;
fourthly, the temperature in the vehicle is less than or equal to B, the generator data acquisition module acquires the magnetic field duty ratio of the generator, the vehicle control unit judges the relation between the magnetic field duty ratio of the generator and C%, if the magnetic field duty ratio of the generator is less than C%, the fifth step is executed, and if the magnetic field duty ratio of the generator is equal to C%, the third step is executed; if the magnetic field duty ratio of the generator is larger than C%, executing the step III;
controlling the idle speed of the engine at a second set value (D-50) rpm, and keeping for E minutes;
sixthly, judging the relation between the magnetic field duty ratio of the generator and C percent, if the magnetic field duty ratio of the generator is less than C percent, executing a step seventhly, and if the magnetic field duty ratio of the generator is equal to C percent, executing a step fifthly; if the magnetic field duty ratio of the generator is larger than C%, executing a fifth step;
controlling the idle speed of the engine to be a third set value (D-100) per minute and maintaining the idle speed for E minutes;
judging the relation between the magnetic field duty ratio of the generator and C%, if the magnetic field duty ratio of the generator is smaller than C%, executing a step ninthly, and if the magnetic field duty ratio of the generator is equal to C%, executing a step seventhly; if the duty ratio of the magnetic field of the generator is larger than C%, executing the step (C);
ninthly, controlling the idle speed of the engine to be a fourth set value (D-150) rpm and maintaining for E minutes;
and (c) monitoring the state of the air conditioner compressor and the vehicle speed in real time in all states in the R, and controlling the idle speed of the engine to be (D-50) revolutions per minute if the air conditioner compressor is turned off or the vehicle speed is greater than Akm/h.
The parameters such as A, B, C, D, E are not fixed values, but ranges, and the ranges can be calibrated according to different vehicle types and different power configurations.
The invention also provides a vehicle, which comprises an engine idle speed control system, wherein the engine idle speed control system comprises an operation data acquisition module, an air conditioner data acquisition module and a controller, and the operation data acquisition module and the air conditioner data acquisition module are connected with the controller; the controller is used for judging whether the air conditioner compressor is started or not and judging whether the current vehicle speed is less than a set value of the vehicle speed or not, and if the air conditioner compressor is started and the current vehicle speed is less than the set value, controlling the idling speed of the engine to be a first set value; and judging whether the temperature in the vehicle is less than a set temperature value or not, and if so, controlling the idling speed of the engine to gradually decrease.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (4)
1. An engine idle speed control method, comprising the steps of:
1) judging whether the air-conditioning compressor is started or not, judging whether the current vehicle speed is less than a set vehicle speed value or not, and if the air-conditioning compressor is started and the current vehicle speed is less than the set vehicle speed value, controlling the idling speed of the engine to be a first set value;
2) under the condition that the idling speed of the engine is a first set value, judging whether the temperature in the vehicle is less than a temperature set value and the magnetic field duty ratio of the generator is less than a magnetic field duty ratio set value or not, and if so, controlling the idling speed of the engine to be reduced to a second set value;
3) under the condition that the idling speed of the engine is a second set value, if the magnetic field duty ratio of the generator is smaller than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be reduced to a third set value, and if the magnetic field duty ratio of the generator is larger than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be a first set value;
4) under the condition that the idling speed of the engine is at a third set value, if the magnetic field duty ratio of the generator is smaller than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be reduced to a fourth set value, and if the magnetic field duty ratio of the generator is larger than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be at a second set value;
5) when the engine idling speed is at a fourth set value, if the magnetic field duty ratio of the generator is greater than the set value of the magnetic field duty ratio, controlling the engine idling speed to be at a third set value;
6) and judging whether the air conditioner compressor is closed or not, judging whether the current vehicle speed is greater than a set vehicle speed value or not, and controlling the idling speed of the engine to be at a fourth set value if the air conditioner compressor is closed or the current vehicle speed is greater than the set vehicle speed value.
2. The engine idle speed control method of claim 1, wherein when controlling the engine idle speed at the first set value, the second set value, the third set value and the fourth set value, the engine is required to continue to operate at the corresponding idle speed for a set time.
3. The engine idle speed control system is characterized by comprising an acquisition module and a controller, wherein the acquisition module is connected with the controller;
the acquisition module is used for acquiring vehicle speed, compressor state and temperature in the vehicle, and the controller is used for realizing the following control steps:
1) judging whether the air-conditioning compressor is started or not, judging whether the current vehicle speed is less than a set vehicle speed value or not, and if the air-conditioning compressor is started and the current vehicle speed is less than the set vehicle speed value, controlling the idling speed of the engine to be a first set value;
2) under the condition that the idling speed of the engine is a first set value, judging whether the temperature in the vehicle is less than a temperature set value and the magnetic field duty ratio of the generator is less than a magnetic field duty ratio set value or not, and if so, controlling the idling speed of the engine to be reduced to a second set value;
3) under the condition that the idling speed of the engine is a second set value, if the magnetic field duty ratio of the generator is smaller than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be reduced to a third set value, and if the magnetic field duty ratio of the generator is larger than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be a first set value;
4) under the condition that the idling speed of the engine is at a third set value, if the magnetic field duty ratio of the generator is smaller than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be reduced to a fourth set value, and if the magnetic field duty ratio of the generator is larger than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be at a second set value;
5) when the engine idling speed is at a fourth set value, if the magnetic field duty ratio of the generator is greater than the set value of the magnetic field duty ratio, controlling the engine idling speed to be at a third set value;
6) and judging whether the air conditioner compressor is closed or not, judging whether the current vehicle speed is greater than a set vehicle speed value or not, and controlling the idling speed of the engine to be at a fourth set value if the air conditioner compressor is closed or the current vehicle speed is greater than the set vehicle speed value.
4. A vehicle comprises an engine idle speed control system, and is characterized in that the engine idle speed control system comprises an acquisition module and a controller, wherein the acquisition module is connected with the controller;
the acquisition module is used for acquiring vehicle speed, compressor state and temperature in the vehicle, and the controller is used for realizing the following control steps:
1) judging whether the air-conditioning compressor is started or not, judging whether the current vehicle speed is less than a set vehicle speed value or not, and if the air-conditioning compressor is started and the current vehicle speed is less than the set vehicle speed value, controlling the idling speed of the engine to be a first set value;
2) under the condition that the idling speed of the engine is a first set value, judging whether the temperature in the vehicle is less than a temperature set value and the magnetic field duty ratio of the generator is less than a magnetic field duty ratio set value or not, and if so, controlling the idling speed of the engine to be reduced to a second set value;
3) under the condition that the idling speed of the engine is a second set value, if the magnetic field duty ratio of the generator is smaller than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be reduced to a third set value, and if the magnetic field duty ratio of the generator is larger than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be a first set value;
4) under the condition that the idling speed of the engine is at a third set value, if the magnetic field duty ratio of the generator is smaller than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be reduced to a fourth set value, and if the magnetic field duty ratio of the generator is larger than the set value of the magnetic field duty ratio, controlling the idling speed of the engine to be at a second set value;
5) when the engine idling speed is at a fourth set value, if the magnetic field duty ratio of the generator is greater than the set value of the magnetic field duty ratio, controlling the engine idling speed to be at a third set value;
6) and judging whether the air conditioner compressor is closed or not, judging whether the current vehicle speed is greater than a set vehicle speed value or not, and controlling the idling speed of the engine to be at a fourth set value if the air conditioner compressor is closed or the current vehicle speed is greater than the set vehicle speed value.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111120088B (en) * | 2019-12-26 | 2021-08-31 | 三一专用汽车有限责任公司 | Vehicle control system, vehicle, and control method |
| CN111365135B (en) * | 2020-03-21 | 2021-05-28 | 东风汽车集团有限公司 | A method for controlling idle speed target speed |
| CN111878243B (en) * | 2020-06-30 | 2021-08-06 | 东风汽车集团有限公司 | A vehicle crawling target idle speed control method and system |
| CN114458464B (en) * | 2020-11-10 | 2023-03-24 | 长城汽车股份有限公司 | Engine idle speed compensation method and device, electronic equipment and storage medium |
| CN115234386B (en) * | 2022-03-22 | 2024-04-26 | 长城汽车股份有限公司 | Idle speed compensation method, device and system and vehicle |
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