CN107893697B - Electronic thermostat opening control method - Google Patents
Electronic thermostat opening control method Download PDFInfo
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- CN107893697B CN107893697B CN201711194148.3A CN201711194148A CN107893697B CN 107893697 B CN107893697 B CN 107893697B CN 201711194148 A CN201711194148 A CN 201711194148A CN 107893697 B CN107893697 B CN 107893697B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2050/00—Applications
- F01P2050/22—Motor-cars
Abstract
The invention discloses a method for controlling the opening degree of an electronic thermostat, which is characterized by comprising the following steps: the method comprises the steps of obtaining a first pre-control duty ratio through duty ratio pre-control MAP output according to target water temperature and relative charge, obtaining a correction coefficient of the first pre-control duty ratio under the influence of air conditioner state, gear, engine speed and relative impulse, and obtaining corrected output as a second pre-control duty ratio; the second pre-control duty ratio is corrected by a temperature correction coefficient to obtain a third pre-control duty ratio; acquiring a duty ratio correction value under a PI algorithm according to a water temperature difference value of the actual water temperature and the target water temperature; adding the third pre-control duty ratio and the duty ratio correction value under the PI algorithm to obtain a fourth duty ratio value; and the fourth duty ratio value is corrected by the storage battery voltage correction coefficient to obtain an electronic thermostat duty ratio control value for controlling the opening of the electronic thermostat. The method can accurately control the opening of the electronic thermostat so as to achieve the aim of controlling the working temperature of the engine.
Description
Technical Field
The invention relates to the technical field of automobile electronic control, in particular to a method for controlling the opening degree of an electronic thermostat.
Background
With the economic development and the technological progress, the automobile plays an indispensable role in the daily life of human beings, and the automobile is not only a simple travel tool, but also a pronoun for comfortable life and happy life, and is an important part of national construction. With the increasing automobile holding capacity, the consumption of non-renewable resources, exhaust emission and atmospheric pollution are more and more serious, and the negative effects brought by automobiles cannot be ignored.
In order to solve the resource problem, more and more vehicle enterprises research various technologies in the aspect of improving the fuel economy of the whole vehicle, and an electronic thermostat is one of the technologies. The electronic thermostat can enable the engine to work at higher water temperature, which can help to reduce the viscosity of engine oil and reduce friction, thereby improving specific fuel consumption.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for controlling the opening degree of an electronic thermostat, which considers the influence of various factors on the electronic thermostat, so that the electronic thermostat can safely and effectively reach the required opening degree, and the temperature of an engine can be regulated and controlled.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for controlling the opening degree of an electronic thermostat comprises,
obtaining a first pre-control duty ratio through duty ratio pre-control MAP output according to the target water temperature and the relative charge, obtaining a correction coefficient of the first pre-control duty ratio under the influence of the air conditioner state, the gear, the engine rotating speed and the relative charge, and obtaining the corrected output as a second pre-control duty ratio;
the second pre-control duty ratio is corrected by a temperature correction coefficient to obtain a third pre-control duty ratio;
acquiring a duty ratio correction value under a PI algorithm according to a water temperature difference value of the actual water temperature and the target water temperature;
adding the third pre-control duty ratio and the duty ratio correction value under the PI algorithm to obtain a fourth duty ratio value;
and the fourth duty ratio value is limited by the maximum value and the minimum value of the duty ratio of the electronic thermostat, and then is corrected by the voltage correction coefficient of the storage battery to obtain the final output value of the duty ratio of the electronic thermostat for controlling the opening of the electronic thermostat.
Acquiring the water temperature at the wax pack, and acquiring the maximum duty ratio PWMMX and the minimum duty ratio PWMMN allowed by the electronic thermostat according to the water temperature at the wax pack;
when the fourth duty ratio value is between PWMMN and PWMMX, the fourth duty ratio value is taken to obtain the duty ratio control value of the electronic thermostat after being corrected by the voltage correction coefficient;
when the fourth duty ratio value is larger than or equal to PWMMX, the maximum duty ratio value PWMMX is taken to obtain a duty ratio control value of the electronic thermostat after being corrected by a voltage correction coefficient;
and when the fourth duty ratio value is smaller than or equal to PWMMN, the minimum duty ratio value PWMMN is taken to obtain the duty ratio control value of the electronic thermostat after being corrected by the voltage correction coefficient.
And the voltage of the storage battery is corrected by a pre-calibrated voltage correction MAP to obtain a voltage correction coefficient.
The correction coefficient of the first pre-control duty ratio is obtained by the following method:
calibrating engine rotation speeds corresponding to different gears and a duty ratio MAP determined by relative charge when an air conditioner is in an opening or closing state in advance;
and acquiring a duty ratio MAP corresponding to the air conditioner state and the gear state, and obtaining an output value which is a correction coefficient of the first pre-control duty ratio through the engine speed and the relative charge according to the duty ratio MAP.
And the product of the first pre-control duty ratio correction coefficient and the first pre-control duty ratio is the second pre-control duty ratio which is output after correction.
The temperature correction coefficient is obtained by correcting MAP according to the environmental temperature through the environmental temperature calibrated in advance; and multiplying the second pre-control duty ratio by the temperature correction coefficient to obtain a third pre-control duty ratio obtained after correction.
The duty ratio correction value under the PI algorithm comprises an I part duty ratio correction value and a P part duty ratio correction value;
the I part duty ratio correction value includes: calibrating the I part duty ratio correction MAP in advance, acquiring a water temperature difference value between the target water temperature and the actual water temperature, taking the water temperature difference value as an input value of the I part duty ratio correction MAP, and integrating an output value of the I part duty ratio correction MAP to obtain the I part electronic thermostat correction duty ratio;
the P-part duty cycle correction value includes: the pre-calibrated P part duty ratio correction MAP has the input of the water temperature difference value and the output of the water temperature difference value is the P part duty ratio correction value;
and the duty ratio correction value under the PI algorithm is the sum of the I part duty ratio correction value and the P part duty ratio correction value.
The invention has the advantages that: the method can accurately control the opening of the electronic thermostat so as to achieve the aim of controlling the working temperature of the engine at the opening of the electronic thermostat; the influence of factors such as target water temperature, air conditioner, gear, vehicle speed and rotating speed on the electronic thermostat is considered, and the electronic thermostat is safely and effectively controlled by correcting MAP. Compared with the prior art that only the target water temperature load is considered, the control method disclosed by the invention is more practical in logic, more comprehensive in consideration and more accurate in control.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic diagram of the output of a second pre-control duty cycle when the air conditioner is turned off according to the present invention;
FIG. 2 is a schematic diagram of the air conditioner outputting a second pre-controlled duty cycle when turned on in accordance with the present invention;
FIG. 3 is a schematic diagram of the correction of the ambient temperature in the control method according to the present invention;
FIG. 4 is a schematic diagram of the correction of the I part duty ratio in the PI algorithm of the control method of the present invention;
FIG. 5 is a schematic diagram of duty cycle correction of part P in the PI algorithm of the control method of the present invention;
FIG. 6 is a schematic diagram of obtaining a fourth duty cycle;
FIG. 7 is a schematic diagram of the output final electronic thermostat control duty cycle after voltage correction.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
A method for controlling the opening degree of an electronic thermostat comprises the steps of firstly obtaining a first pre-control duty ratio through duty ratio pre-control MAP output according to a target water temperature and a relative charge, obtaining a correction coefficient of the first pre-control duty ratio under the influence of an air conditioner state, a gear, an engine rotating speed and the relative charge, and obtaining a second pre-control duty ratio which is the corrected output; the duty ratio pre-control MAP is obtained through calibration of a target water temperature and a relative charge in advance, and a first pre-control duty ratio can be obtained through the duty ratio pre-control MAP after the target water temperature and the relative charge are known as input. The correction coefficient of the first pre-control duty ratio under the influence of the air-conditioning state, the gear, the engine speed and the relative impulse is obtained by the following method:
calibrating engine rotation speeds corresponding to different gears and a duty ratio MAP determined by relative charge when an air conditioner is in an opening or closing state in advance;
and acquiring a duty ratio MAP corresponding to the air conditioner state and the gear state, and obtaining an output value which is a correction coefficient of the first pre-control duty ratio through the engine speed and the relative charge according to the duty ratio MAP.
And the product of the first pre-control duty ratio correction coefficient and the first pre-control duty ratio is the second pre-control duty ratio which is output after correction.
The second pre-control duty ratio is corrected by a temperature correction coefficient to obtain a third pre-control duty ratio; the temperature correction coefficient is obtained by correcting MAP according to the environmental temperature through the environmental temperature calibrated in advance, the input is the environmental temperature, and the output is the correction coefficient; and multiplying the second pre-control duty ratio by the temperature correction coefficient to obtain a third pre-control duty ratio obtained after correction.
Acquiring a duty ratio correction value under a PI algorithm according to a water temperature difference value of the actual water temperature and the target water temperature;
adding the third pre-control duty ratio and the duty ratio correction value under the PI algorithm to obtain a fourth duty ratio value;
and the fourth duty ratio value is limited by the maximum value and the minimum value of the duty ratio of the electronic thermostat, and then is corrected by the voltage correction coefficient of the storage battery to obtain the duty ratio control value of the electronic thermostat for controlling the opening of the electronic thermostat. And the voltage of the storage battery is corrected by a pre-calibrated voltage correction MAP to obtain a voltage correction coefficient.
Since the wax package water temperature defines the maximum value and the minimum value of the duty ratio, at this time, the fourth duty ratio value may exceed the range, and in order to prevent the electronic thermostat from being damaged due to exceeding the range, the fourth pre-control duty ratio value needs to be judged by a table, that is, the fourth duty ratio value is limited by the maximum value and the minimum value of the duty ratio of the electronic thermostat, which is specifically as follows:
acquiring the water temperature at the wax pack, and acquiring the maximum duty ratio PWMMX and the minimum duty ratio PWMMN allowed by the electronic thermostat according to the water temperature at the wax pack;
when the fourth duty ratio value is between PWMMN and PWMMX, the fourth duty ratio value is taken to obtain the duty ratio control value of the electronic thermostat after being corrected by the voltage correction coefficient;
when the fourth duty ratio value is larger than or equal to PWMMX, the maximum duty ratio value PWMMX is taken to obtain a duty ratio control value of the electronic thermostat after being corrected by a voltage correction coefficient;
and when the fourth duty ratio value is smaller than or equal to PWMMN, the minimum duty ratio value PWMMN is taken to obtain the duty ratio control value of the electronic thermostat after being corrected by the voltage correction coefficient.
The duty ratio correction value under the PI algorithm comprises an I part duty ratio correction value and a P part duty ratio correction value;
the I part duty ratio correction value includes: calibrating the I part duty ratio correction MAP in advance, acquiring a water temperature difference value between the target water temperature and the actual water temperature, taking the water temperature difference value as an input value of the I part duty ratio correction MAP, and integrating an output value of the I part duty ratio correction MAP to obtain the I part electronic thermostat correction duty ratio;
the P-part duty cycle correction value includes: the pre-calibrated P part duty ratio correction MAP has the input of the water temperature difference value and the output of the water temperature difference value is the P part duty ratio correction value;
and the duty ratio correction value under the PI algorithm is the sum of the I part duty ratio correction value and the P part duty ratio correction value.
As shown in the figure, fig. 1 and fig. 2 are schematic diagrams of a first pre-control duty ratio obtained when the air conditioner is turned off and turned on respectively, and the engine speed corresponding to different gears and the duty ratio MAP determined by relative charge are calibrated in advance when the air conditioner is in an on or off state; taking five gears as an example, when the air conditioner is closed, the pre-calibrated duty ratios MAP determined by the engine speed and the relative charge corresponding to the five gears are respectively as follows: duty cycle MAP1, duty cycle MAP2, duty cycle MAP3, duty cycle MAP4, duty cycle MAP 5; in the open mode of the air conditioner, the pre-calibrated duty ratios MAP determined by the engine speed and the relative impulse corresponding to the five gears are respectively as follows: duty cycle MAP6, duty cycle MAP7, duty cycle MAP8, duty cycle MAP9, and duty cycle MAP 10. The duty ratio MAP is determined after the air-conditioning state and the gear are determined, and then a correction coefficient for correcting the first pre-control duty ratio can be obtained according to the relative charge and the engine speed. The product of the correction coefficient and the first pre-control duty ratio is the pre-control duty ratio of the electronic thermostat when the air conditioner is opened/closed, namely the second pre-control duty ratio.
Considering the air conditioner, the air conditioning state needs to be considered because the fan is turned on when the air conditioner is turned on, which has a large influence on the whole temperature field. Meanwhile, the module also considers the influence of gears, and because of different gears, even if the same engine speed is the same, the vehicle speed is different, so that different windward sides are caused, and the water temperature control is influenced.
The pre-control duty ratio of the electronic thermostat refers to a duty ratio which enables the actual water temperature to be stabilized at the target water temperature without considering the PI function.
The specific implementation method is as follows, taking the air conditioner off as an example: under different gears, the target water temperature and the relative charge determine a duty ratio pre-control MAP, meanwhile, the product of the rotating speed and the relative charge also determines a duty ratio MAP, and the product of the values of 2 MAP is used as the output value of the pre-control duty ratio of the electronic thermostat when the air conditioner is closed.
FIG. 3 provides an output method of the pre-controlled duty cycle of the electronic thermostat, and the air conditioner is turned on or off to determine the output value of the multiplexer, and then the temperature is corrected. And the multipath selection selects the output pre-control duty ratio of the electronic thermostat when the air conditioner is opened or the output pre-control duty ratio of the electronic thermostat when the air conditioner is closed according to the opening or closing state of the air conditioner, and then the pre-control duty ratio of the electronic thermostat after temperature correction is obtained by correcting the pre-control duty ratio of the electronic thermostat through the ambient temperature correction coefficient. The temperature correction is obtained through the ambient temperature value according to the pre-calibrated ambient temperature correction MAP, and the ambient correction coefficient is multiplied by the output pre-control duty ratio corresponding to the selected air conditioner state, namely the pre-control duty ratio of the electronic thermostat after the ambient temperature correction.
Considering the influence of the PI algorithm control on the duty ratio, as shown in fig. 4 and 5, I part duty ratio correction and P part duty ratio correction are respectively performed. And (3) performing an algorithm of the part I in the PI algorithm, so that the duty ratio of the electronic thermostat is corrected, and the target water temperature is controlled. The deviation of the target water temperature and the actual water temperature is used as input, and then the purpose of continuously adjusting the duty ratio is achieved through K integration. The output value is limited to 0 at minimum and to 100-pilot duty cycle at maximum. And the P part corrects the MAP according to the P part duty ratio through the water temperature difference value to obtain a P part duty ratio correction value. The P part duty ratio correction MAP and the I part duty ratio correction MAP are calibrated in advance. And adding the corrected duty ratio value of the electronic thermostat of the I part and the corrected duty ratio value of the P part obtained by the PI algorithm and the pre-controlled duty ratio of the electronic thermostat corrected by the ambient temperature to obtain the unrestricted duty ratio of the electronic thermostat.
The unrestricted electronic thermostat duty cycle may be greater than the maximum control value or the minimum control value of the electronic thermostat, which needs to be restricted. The electronic thermostat is expanded by heating an internal resistor, and if the power of the electronic thermostat is not limited, the thermostat is continuously opened under the driving of power supply until the electronic thermostat is clamped and damaged seriously. Limiting its power requires 2 aspects of water temperature and voltage to be considered. Firstly, the water temperature at the wax pack is high, so that the thermostat has a certain opening degree, and the duty ratio needs to be reduced along with the increase of the water temperature at the wax pack. Meanwhile, as the voltage rises, the same duty ratio causes the power to become larger, so voltage correction is introduced. PWMMX and PWMMN need to be provided by the electronic thermostat supplier and voltage correction needs to take power into account. Acquiring a maximum duty ratio value PWMMX and a minimum duty ratio value PWMMN allowed by the electronic thermostat according to the water temperature at the wax pack; when the duty ratio of the unrestricted electronic thermostat is between PWMMX and PWMMN, the duty ratio value of the unrestricted electronic thermostat is multiplied by a voltage correction coefficient to obtain a final output value of the duty ratio of the electronic thermostat so as to control the opening of the electronic thermostat; when the duty ratio is larger than or equal to PWMMX, the maximum duty ratio PWMMX is multiplied by the voltage correction coefficient to obtain a final output value of the duty ratio of the electronic thermostat so as to control the opening of the electronic thermostat; and when the duty ratio is smaller than or equal to PWMMN, obtaining a final output value of the duty ratio of the electronic thermostat after multiplying the minimum duty ratio PWMMN by the voltage correction coefficient so as to control the opening of the electronic thermostat.
The voltage correction coefficient is a storage battery voltage correction coefficient, a pre-calibrated voltage correction MAP table is used for outputting the voltage correction coefficient obtained according to the storage battery voltage and the voltage correction MAP after the storage battery voltage is obtained as input.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (6)
1. A method for controlling the opening degree of an electronic thermostat is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
obtaining a first pre-control duty ratio through duty ratio pre-control MAP output according to the target water temperature and the relative charge, obtaining a correction coefficient of the first pre-control duty ratio under the influence of the air conditioner state, the gear, the engine rotating speed and the relative impulse, and obtaining the corrected output as a second pre-control duty ratio;
the second pre-control duty ratio is corrected by a temperature correction coefficient to obtain a third pre-control duty ratio;
acquiring a duty ratio correction value under a PI algorithm according to a water temperature difference value of the actual water temperature and the target water temperature;
adding the third pre-control duty ratio and the duty ratio correction value under the PI algorithm to obtain a fourth duty ratio value;
after the fourth duty ratio value is limited by the maximum value and the minimum value of the duty ratio of the electronic thermostat, the duty ratio control value of the electronic thermostat for controlling the opening of the electronic thermostat is obtained after the correction of the voltage correction coefficient of the storage battery;
the electronic thermostat duty cycle maximum and minimum limits include: acquiring a maximum duty ratio value PWMMX and a minimum duty ratio value PWMMN allowed by the electronic thermostat according to the water temperature at the wax pack;
when the fourth duty ratio value is between PWMMN and PWMMX, the fourth duty ratio value is taken to obtain the duty ratio control value of the electronic thermostat after being corrected by the voltage correction coefficient;
when the fourth duty ratio value is larger than or equal to PWMMX, the maximum duty ratio value PWMMX is taken to obtain a duty ratio control value of the electronic thermostat after being corrected by a voltage correction coefficient;
and when the fourth duty ratio value is smaller than or equal to PWMMN, the minimum duty ratio value PWMMN is taken to obtain the duty ratio control value of the electronic thermostat after being corrected by the voltage correction coefficient.
2. The method for controlling the opening degree of an electronic thermostat according to claim 1, characterized in that: and the voltage of the storage battery is corrected by a pre-calibrated voltage correction MAP to obtain a voltage correction coefficient.
3. The method for controlling the opening degree of an electronic thermostat according to claim 1, characterized in that: the correction coefficient of the first pre-control duty ratio is obtained by the following method:
calibrating engine rotation speeds corresponding to different gears and a duty ratio MAP determined by relative charge when an air conditioner is in an opening or closing state in advance;
and acquiring a duty ratio MAP corresponding to the air conditioner state and the gear state, and obtaining an output value which is a correction coefficient of the first pre-control duty ratio through the engine speed and the relative charge according to the duty ratio MAP.
4. A method of controlling an opening degree of an electronic thermostat according to claim 1 or 2, characterized by: and the product of the first pre-control duty ratio correction coefficient and the first pre-control duty ratio is the second pre-control duty ratio which is output after correction.
5. A method of controlling an opening degree of an electronic thermostat according to claim 1 or 2, characterized by: the temperature correction coefficient is obtained by correcting MAP according to the environmental temperature through the environmental temperature calibrated in advance; and multiplying the second pre-control duty ratio by the temperature correction coefficient to obtain a third pre-control duty ratio obtained after correction.
6. A method of controlling an opening degree of an electronic thermostat according to claim 1 or 2, characterized by: the duty ratio correction value under the PI algorithm comprises an I part duty ratio correction value and a P part duty ratio correction value;
the I part duty ratio correction value includes: calibrating the I part duty ratio correction MAP in advance, acquiring a water temperature difference value between the target water temperature and the actual water temperature, taking the water temperature difference value as an input value of the I part duty ratio correction MAP, and integrating an output value of the I part duty ratio correction MAP to obtain the I part electronic thermostat correction duty ratio;
the P-part duty cycle correction value includes: the pre-calibrated P part duty ratio correction MAP has the input of the water temperature difference value and the output of the water temperature difference value is the P part duty ratio correction value;
and the duty ratio correction value under the PI algorithm is the sum of the I part duty ratio correction value and the P part duty ratio correction value.
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| FR3087488B1 (en) | 2018-10-23 | 2020-12-18 | Psa Automobiles Sa | PROCESS FOR EARLY OPENING OF A COLD THERMOSTAT IN AN ENGINE COOLING SYSTEM |
| CN111335999B (en) * | 2018-12-18 | 2021-02-05 | 广州汽车集团股份有限公司 | Control method and device of electric heating thermostat and electronic control unit |
| FR3090741B1 (en) | 2018-12-20 | 2020-12-18 | Psa Automobiles Sa | COOLING SYSTEM OF A TURBOCHARGER OF A HYBRID ENGINE |
| CN111434902A (en) * | 2019-01-15 | 2020-07-21 | 北京汽车股份有限公司 | Control method and system of thermostat and vehicle |
| CN112631349B (en) * | 2019-09-24 | 2021-09-17 | 北京亿华通科技股份有限公司 | Control method, control device, computer equipment and storage medium |
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| CN112711282B (en) * | 2021-01-12 | 2021-11-26 | 上海捷氢科技有限公司 | Water temperature control method and system of fuel cell |
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| CN113464263B (en) * | 2021-07-30 | 2023-04-07 | 中国重汽集团济南动力有限公司 | Control method and system for electronic thermostat of commercial vehicle |
| CN114483284B (en) * | 2022-04-02 | 2022-07-15 | 潍柴动力股份有限公司 | Control system and method of electric control thermostat |
| CN115419497B (en) * | 2022-08-31 | 2024-02-23 | 潍柴动力股份有限公司 | Electronic thermostat monitoring method, electronic thermostat monitoring device, electronic thermostat monitoring equipment, storage medium and vehicle |
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| CN106246328A (en) * | 2016-08-26 | 2016-12-21 | 广州汽车集团股份有限公司 | The control method of a kind of automobile engine water-cooling system electronic water pump and device |
| CN106285907A (en) * | 2016-10-19 | 2017-01-04 | 潍柴动力股份有限公司 | The control method of a kind of engine temperature, Apparatus and system |
| CN106837509A (en) * | 2017-04-14 | 2017-06-13 | 北京理工大学 | A kind of fan rotational frequency control method and system |
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