CN115263579B - Engine throttle control signal generating device and method - Google Patents
Engine throttle control signal generating device and method Download PDFInfo
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- CN115263579B CN115263579B CN202210915849.6A CN202210915849A CN115263579B CN 115263579 B CN115263579 B CN 115263579B CN 202210915849 A CN202210915849 A CN 202210915849A CN 115263579 B CN115263579 B CN 115263579B
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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
- F02D41/0002—Controlling intake air
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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
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
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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
- F02D41/0205—Circuit arrangements for generating control signals using an auxiliary engine speed control
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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
- F02D41/0002—Controlling intake air
- F02D2041/0022—Controlling intake air for diesel engines by throttle control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention belongs to the technical field of fuel consumption of engine control machines, and discloses an engine throttle control signal generating device and method, aiming at the control problem of engine spindle rotation speed when an automobile engine adopts an engine rotation speed to improve engine fuel efficiency according to a fuel consumption rate minimum principle.
Description
Technical Field
The invention belongs to the technical field of fuel consumption of engine control machines, and particularly relates to an engine throttle control signal generating device and method.
Background
At present, the exhaustion of petroleum and environmental pollution have become the most urgent problems facing the world automobile industry and even the whole human beings, and how to improve the fuel efficiency of an engine, including the improvement of the fuel automobiles on the market, is more and more paid attention to governments of various countries.
The Chinese patent number is CN201911034826.9 and the application date is 2019-10-29, and a control method for improving the fuel efficiency of an engine is disclosed, namely, an actual throttle opening control signal is a weighted result of a throttle opening control signal determined by an electronic throttle and a throttle opening control signal determined by an engine speed according to a fuel consumption rate minimum principle, the larger the weight value is, the closer the actual throttle opening is to the throttle opening control signal determined by the electronic throttle, and the weighted weight value is determined according to the acceleration of an accelerator pedal, so that the fuel consumption rate of the engine is better than that of the throttle opening determined by the electronic throttle alone; however, the method has the defects that the accurate acceleration value of the accelerator pedal of the engine needs to be obtained in real time, and the method is complex and has poor stability.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an engine throttle control signal generating device and method, which can determine the weight used in the process of acquiring the actual throttle control signal without a signal of an accelerator pedal.
In order to achieve the above purpose, the technical scheme adopted by the method is as follows: an engine throttle control signal generating device comprising a microprocessor, said device having two input signals and an output signal, both said input signals being engine speed signals respectivelynAnd throttle control signals generated by an engine controllerQCThe output signal is an actual throttle control signalQAThe actual throttle control signalQATo a throttle control motor, said throttle control signalQCAnd the microprocessor stores the minimum fuel consumption rate curve data of the engine offline without being sent to the throttle control motor.
A method of generating an engine throttle control signal, comprising the steps of:
step 2, detecting engine rotating speed signals on linenAnd electronic throttle foot pedal signalhThe engine speed signalnThrottle control signal via fuel consumption rate minimum curveQNThe electronic accelerator pedal signal h is output through an engine controller to obtain a throttle control signalQCThe throttle control signalQCWith throttle control signalsQNWeighted sum yields actual throttle control signal for engineQA；
The actual throttle control signalQAThe calculation formula of (2) is as follows:
QA＝（1-α）QN＋αQC（1）
wherein alpha is a weighted weight (0 < alpha < 1);
and step 3, the method for obtaining the weighted weight alpha comprises the following steps:
a, determining throttle control signal off-lineQCAnd throttle control signalQNThe maximum absolute value of the difference L0;
b, on-line detecting and calculating throttle control signalQCAnd save gasDoor control signalQNAn absolute instantaneous value L of the difference;
c, the ratio of L to L0 obtains a weighting weight alpha.
The electronic accelerator pedal signalhWhen there is a signal, the actual throttle control signalQAA control motor fed to the throttle valve; the electronic accelerator pedal signalhAnd when no signal exists, the engine is in idle oil injection.
In step 1, the method for obtaining the minimum fuel consumption rate curve of the engine is as follows:
a. the main shaft rotation speed of the engine is stabilized at a definite value through the electronic accelerator pedalN1, perturbing the load of the output end of the engine, changing the opening of a throttle valve from small to large in an allowable range, and searching the opening of the throttle valve when the fuel consumption rate of the engine is minimumQ1, from%Q1，N1) Determining a point on a relationship curve between engine speed and throttle opening at which a fuel consumption rate is minimized;
b. by sequentially varying the rotational speed of the engine main shaftN1，N2，......，Nm, sequentially searching throttle opening degree when fuel consumption rate is minimumQ1，Q2，......，Qm for these m points (. About.)Q1，N1），（Q2，N2），......，（Qm，Nm)) curve fitting to obtain a minimum fuel consumption rate curve of the engine;
c. the throttle valve opening degreeQ1，Q2，......，Qm is a throttle control signal generated by an engine controller at a corresponding speed at which fuel consumption rate is minimalQC。
The method for realizing the weighted sum in the engine controller is characterized in that the weighted sum result is sent to an execution motor of a throttle valve through a corresponding output port A of the engine controller, and an electronic throttle pedal signal is sent to the engine controller through the corresponding output port AhWithout the signal, the engine is idling for injection.
Compared with the prior art, the invention has the advantages and beneficial effects that: weighting the signals of the throttle pedal not needed in the process of acquiring the actual throttle control signals, wherein the closer the weighted throttle opening control signals are to throttle control signals determined by the electronic throttle output signals, the better the engine control sensitivity is, and the worse the fuel efficiency is; the closer the weighted throttle control signal is to the throttle control signal determined by the minimum fuel consumption rate curve, the worse the engine control sensitivity is, the better the fuel efficiency is, and when the accelerator pedal is not moving, the weight increases along with the decrease of the engine speed, which is helpful for automatic speed stabilization, and the weight decreases along with the increase of the engine speed, which is helpful for energy saving and emission reduction of the engine.
Drawings
The invention will be further described in detail with reference to the drawings and detailed description, wherein:
FIG. 1 is a functional block diagram of a weighting module when implemented outside an engine controller;
fig. 2 is a functional block diagram of the weighting module when implemented in an engine controller.
Detailed Description
Example 1
An engine throttle control signal generating device comprising a microprocessor, said device having two input signals and an output signal, both said input signals being engine speed signals respectivelynAnd throttle control signals generated by an engine controllerQCThe output signal is an actual throttle control signalQAThe actual throttle control signalQATo a throttle control motor, said throttle control signalQCAnd the microprocessor stores the minimum fuel consumption rate curve data of the engine offline without being sent to the throttle control motor.
As shown in FIG. 1, the method for implementing the weighted sum outside the engine controller includes a means for implementing the weighting having two input signals and one output signal and a throttle control motor.
A method of generating an engine throttle control signal, comprising the steps of:
step 2, detecting engine rotating speed signals on linenAnd electronic throttle foot pedal signalhThe saidEngine speed signalnThrottle control signal via fuel consumption rate minimum curveQNThe electronic accelerator pedal signalhThe throttle control signal is obtained through the output of the engine controllerQCThe throttle control signalQCWith throttle control signalsQNWeighted sum yields actual throttle control signal for engineQA；
The actual throttle control signalQAThe calculation formula of (2) is as follows:
QA＝（1-α）QN＋αQC（1）
wherein alpha is a weighted weight (0 < alpha < 1);
and step 3, the method for obtaining the weighted weight alpha comprises the following steps:
a, determining throttle control signal off-lineQCAnd throttle control signalQNThe maximum absolute value of the difference L0;
b, on-line detecting and calculating throttle control signalQCAnd throttle control signalQNAn absolute instantaneous value L of the difference;
c, the ratio of L to L0 obtains a weighting weight alpha.
The electronic accelerator pedal signalhWhen there is a signal, the actual throttle control signalQAA control motor fed to the throttle valve; the electronic accelerator pedal signalhAnd when no signal exists, the engine is in idle oil injection.
In step 1, the method for obtaining the minimum fuel consumption rate curve of the engine is as follows:
a. the main shaft rotation speed of the engine is stabilized at a definite value through the electronic accelerator pedalN1, perturbing the load of the output end of the engine, changing the opening of a throttle valve from small to large in an allowable range, and searching the opening of the throttle valve when the fuel consumption rate of the engine is minimumQ1, from%Q1，N1) Determining a point on a relationship curve between engine speed and throttle opening at which a fuel consumption rate is minimized;
b. by sequentially varying the rotational speed of the engine main shaftN1，N2，......，Nm, sequentially searching throttle opening degree when fuel consumption rate is minimumQ1，Q2，......，Qm for these m points (. About.)Q1，N1），（Q2，N2），......，（Qm，Nm)) curve fitting to obtain a minimum fuel consumption rate curve of the engine;
c. the throttle valve opening degreeQ1，Q2，......，Qm is a throttle control signal generated by an engine controller at a corresponding speed at which fuel consumption rate is minimalQC。
As shown in FIG. 2, the method for realizing weighted sum in the engine controller is characterized in that the result of the weighted sum is sent to the executing motor of the throttle valve through the corresponding output port A of the engine controller, and the signal of the pedal of the electronic throttle valvehWithout the signal, the engine is idling for injection.
When the weight value in the actual throttle opening process is determined according to the weighted result of the throttle opening determined by the electronic throttle pedal output signal and the engine speed according to the minimum fuel consumption rate curve, the signal of the throttle pedal does not need to be sampled in real time, and when the throttle pedal is not moving, the weight value is increased along with the decrease of the engine speed, so that the automatic speed stabilization is facilitated, the weight value is reduced along with the increase of the engine speed, the energy conservation and the emission reduction of the engine are facilitated, the control process is simpler, and the reliability is better.
The method for off-line testing the relation curve between the engine speed and the throttle opening when the fuel consumption rate of the engine is minimum comprises the following steps: the electronic accelerator pedal is controlled to enable the rotation speed of the main shaft of the engine to be stabilized at a determined value N1, the load of the output end of the engine is disturbed, the opening degree of a throttle valve is changed from small to large in an allowable range, the opening degree Q1 of the throttle valve when the fuel consumption rate of the engine is minimum is found, points on a relation curve between the rotation speed of the engine and the opening degree of the throttle valve when the fuel consumption rate is minimum can be determined by (Q1, N1), the rotation speed of the main shaft of the engine is sequentially changed and stabilized at N2, N3, nm, the opening degree Q2, Q3 when the fuel consumption rate is minimum is sequentially found, the values of Qm and Qm are sequentially found, curve fitting is carried out on the m points ((Q1, N1), (Q2, N2) and (Qm, nm), and the minimum curve of the fuel consumption rate of the engine can be obtained, the opening degree Q1, Q2, qm is the throttle valve opening degree control signal generated by a traditional engine controller when the fuel consumption rate is minimum at the corresponding rotation speed.
As is known from the engine load characteristics, at a fixed rotation speed, the fuel consumption rate at different throttle openings has a minimum value, i.e., an optimal throttle opening, and on the side where the throttle opening is larger than the optimal throttle opening, the fuel consumption rate monotonically increases with an increase in the throttle opening, and on the side where the throttle opening is smaller than the optimal throttle opening, the fuel consumption rate monotonically decreases with an increase in the throttle opening; on-line detecting engine speed signal and electronic throttle output signal, the throttle control signal determined by engine speed according to minimum fuel consumption rate curve isQNThe throttle control signal determined by the electronic throttle output signal isQCActual throttle control signalQAThen it isQN、QCIs a weighted sum of (1), namely:
QA＝（1-α）QN＋αQC（1）
wherein alpha is a weighted weight (0 < alpha < 1).
In the formula (1), the closer the weighted throttle opening control signal is to the throttle opening control signal determined by the electronic throttle output signal, the better the engine control sensitivity, the worse the fuel efficiency; the closer the weighted throttle opening control signal is to the throttle opening control signal determined by the minimum curve of the fuel consumption rate according to the engine speed, the worse the engine control sensitivity is, the better the fuel efficiency is, and the weighted weight determining method comprises the following steps: 1. determining an absolute value maximum value Lo of a difference between a throttle opening control signal determined by an electronic throttle output signal and a throttle opening control signal determined by an engine speed according to a fuel consumption rate minimum curve in an off-line manner; 2. on-line detection and calculation of an absolute instantaneous value L of a difference between a throttle opening control signal determined by an electronic throttle and a throttle opening control signal determined by an engine speed according to a minimum fuel consumption rate curve; 3. the ratio of L to Lo is the weight.
When the weighting function is realized outside the engine controller, the electronic throttle has a signal, the actual throttle opening control signal given by the weighting module is directly given to the throttle executing motor, the electronic throttle does not have signal output through the engine controller, and the engine is in idle oil injection.
When the weighting function is realized in the engine controller, the electronic throttle has a signal, the weighting module is a section of program, the weighting result is sent to the throttle executing motor through the corresponding output port of the engine controller, the electronic throttle has no signal output, and the engine is in idle oil injection.
The microprocessor may be a single-chip microcomputer.
In the present description, it should be noted that, as the throttle control motor is equivalent to the throttle actuator motor, the terms "first", "second", "left end", "right end", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the product is conventionally put in use, only for convenience of description and simplification of description, and do not indicate or imply that the device or element to be referred must have a specific azimuth, be configured and operated in a specific azimuth, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
The foregoing examples merely represent specific embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present application, which fall within the protection scope of the present application.
Claims (4)
1. A control signal generating method of engine throttle valve, the control signal generating device used contains microprocessor, characterized by: the device is provided with two input signals and one output signal, wherein the two input signals are an engine rotating speed signal n and a throttle control signal QC generated by an engine controller respectively, the output signal is an actual throttle control signal QA, the actual throttle control signal QA is sent to a throttle control motor, the throttle control signal QC is not sent to the throttle control motor any more, and the microprocessor stores minimum fuel consumption rate curve data of the engine offline;
the control signal generation method comprises the following steps:
step 1: establishing a minimum fuel consumption rate curve of the engine offline;
step 2: detecting an engine rotating speed signal n and an electronic throttle pedal signal h on line, wherein the engine rotating speed signal n is a throttle control signal QN obtained through a fuel consumption rate minimum curve, the electronic throttle pedal signal h is output through an engine controller to obtain a throttle control signal QC, and the throttle control signal QC and the throttle control signal QN are weighted and summed to obtain an actual throttle control signal QA of the engine;
the calculation formula of the actual throttle control signal QA is as follows:
QA＝(1-α)QN+αQC(1)
wherein alpha is a weighted weight (0 < alpha < 1);
step 3: the method for obtaining the weighted weight alpha comprises the following steps:
(1) Determining a maximum absolute value L0 of a difference between the throttle control signal QC and the throttle control signal QN offline;
(2) On-line detection calculates an absolute instantaneous value L of the difference between the throttle control signal QC and the throttle control signal QN;
(3) The ratio of L to L0 yields the weighting value α.
2. An engine throttle control signal generation method according to claim 1, characterized in that: when the electronic throttle pedal signal h has a signal, the actual throttle control signal QA is sent to a control motor of a throttle valve; and when the electronic accelerator pedal signal h is not provided with a signal, the engine is in idle oil injection.
3. An engine throttle control signal generation method according to claim 1, characterized in that: in step 1, the method for obtaining the minimum fuel consumption rate curve of the engine is as follows:
a. stabilizing the rotating speed of a main shaft of an engine at a determined value N1 through an electronic accelerator pedal, perturbing the load of an output end of the engine, changing the opening of a throttle valve from small to large in an allowable range, searching the opening Q1 of the throttle valve when the fuel consumption rate of the engine is minimum, and determining a point on a relation curve between the rotating speed of the engine and the opening of the throttle valve when the fuel consumption rate is minimum by (Q1, N1);
b. by sequentially changing the engine spindle rotation speeds N1, N2, & gt, nm, sequentially finding the throttle opening degrees Q1, Q2, qm when the fuel consumption rate is minimum, & gt, curve fitting the m points ((Q1, N1), (Q2, N2), & gt, (Qm, nm)), to obtain an engine fuel consumption rate minimum curve;
c. the throttle opening Q1, Q2 is the throttle control signal QC generated by the engine controller when the fuel consumption rate is minimum at the corresponding rotational speed.
4. An engine throttle control signal generation method according to claim 1, characterized in that: the weighted sum method is realized in the engine controller, the result of the weighted sum is sent to the executing motor of the throttle valve through the corresponding output port A of the engine controller, and when the signal h of the electronic accelerator pedal is not provided, the engine is in idle oil injection.
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