CN109404152B - Fuel supply closed-loop control method for vehicle electric control methanol-diesel dual-fuel engine - Google Patents
Fuel supply closed-loop control method for vehicle electric control methanol-diesel dual-fuel engine Download PDFInfo
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- CN109404152B CN109404152B CN201811259327.5A CN201811259327A CN109404152B CN 109404152 B CN109404152 B CN 109404152B CN 201811259327 A CN201811259327 A CN 201811259327A CN 109404152 B CN109404152 B CN 109404152B
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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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
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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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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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
- F02D41/14—Introducing closed-loop corrections
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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
- F02D41/30—Controlling fuel injection
- F02D41/3094—Controlling fuel injection the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
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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
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
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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
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a fuel supply closed-loop control method for an automotive electric control methanol-diesel dual-fuel engine, which adjusts the injection quantity of methanol and diesel according to non-resonance knock sensor signals filtered by different frequencies, thereby avoiding the knock phenomenon and improving the use economy and reliability of the methanol-diesel dual-fuel engine on the premise of ensuring the maximum methanol utilization rate.
Description
Technical Field
The invention belongs to the field of application of alternative fuels of automotive engines, and particularly relates to a closed-loop automotive methanol-diesel dual-fuel engine fuel supply strategy based on knocking.
Background
Because the soot emission of the diesel engine is large, the diesel engine seriously harms the atmospheric environment, and an economical and effective solution is to reform the diesel engine into a dual-fuel engine at present. The dual-fuel engine is coupled with two fuels with different activities, the low-activity fuel (methanol) enters the cylinder in a premixed mode, the high-activity fuel (diesel) is sprayed when the piston moves to the position near a compression top dead center to realize co-combustion, the introduced low-activity fuel can effectively reduce the soot emission of the engine, and the price of the low-activity fuel (methanol) is lower than that of the high-activity fuel (diesel), so that the combustion mode can effectively reduce the operation cost of the diesel engine while reducing the smoke discharge, and has strong popularization and application potentials.
In order to improve the use economy of the methanol-diesel dual-fuel engine, the general method is to increase the substitution rate of methanol for diesel oil as much as possible, and the excessively high substitution rate of methanol can easily cause the dual-fuel engine to knock, so that the engine is damaged. Because the current calculation strategy of the fuel supply amount of the dual-fuel engine still uses the torque as the target of the traditional electric control diesel engine and is based on the open-loop control method of the rotating speed and the accelerator pedal, when the actual running condition of the engine is not suitable for calibrating the maximum methanol substitution rate determined in the MAP, the engine is easy to knock, and if the lower methanol substitution rate is used for calculating the injection amount of methanol and diesel, the use economy of the engine cannot be improved; there is therefore a need for a control strategy for dual fuel engines that enables dynamic closed loop adjustment of methanol substitution rate.
For methanol-diesel dual fuel engines, different diesel injection strategies are suitably adopted for different loads: at medium and low loads, a double-injection strategy containing one-time pre-injection is adopted to reduce the rough degree of the work of the engine; and at high load, single injection is suitable for reducing pollutant emission, which is also the selection of the injection strategy of the traditional diesel engine at present.
At present, related patents of domestic automotive electric control dual-fuel engines mainly focus on the fields of hardware technologies such as injectors and fuel supply devices and the overall design of an electric control system, and related patents related to specific fuel supply strategies are not found. In addition, the domestic related patents of the closed-loop control technology for knocking focus on the aspects of knock signal detection and a knock sensor structure, and are mainly applied to spark ignition gasoline engines, and the closed-loop correction object is the ignition advance angle.
Disclosure of Invention
The invention aims to provide a fuel supply closed-loop control method for an automotive electric control methanol-diesel dual-fuel engine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fuel supply closed-loop control method for an automotive electric control methanol-diesel dual-fuel engine comprises the following steps:
the method comprises the steps of judging the occurrence of the knock according to the knock characteristic frequency of an engine body in different diesel injection modes, and synchronously adjusting the injection amount of methanol and diesel according to the heat values of the methanol and the diesel to maximize the methanol substitution rate of the engine and quickly break away from the knock, wherein the knock characteristic frequency refers to the frequency of enhancing the vibration energy density of the engine body when the knock occurs.
Preferably, the closed-loop control method specifically includes the steps of:
1) determining the working condition of the engine and the basic injection quantity of diesel and methanol according to the current rotating speed and the opening degree of an accelerator of the methanol-diesel dual-fuel engine;
2) according to the current diesel injection mode of the methanol-diesel dual-fuel engine, filtering a vibration signal detected by a non-resonance type knock sensor arranged on a body of the methanol-diesel dual-fuel engine to obtain a vibration signal v of the engine under the knock characteristic frequency of the diesel injection mode;
3) the vibration signal v obtained after the processing of the step 2) and the vibration signal v obtained after the same filtering processing when the engine knocks under the diesel injection mode are adoptedpCarrying out comparison;
4) if v is greater than vpThe maximum value of the methanol injection amount is judged to be knocking, and under the condition that the working condition of the engine is kept stable, the methanol injection amount is reduced, and the diesel injection amount is increased to adjust the corresponding basic injection amount so as to eliminate the knocking; otherwise, the corresponding basic injection quantity is adjusted by increasing the methanol injection quantity and reducing the diesel injection quantity so as to improve the methanol injection quantityAnd (4) replacement rate.
Preferably, the basic injection quantity of the diesel oil and the basic injection quantity of the methanol are calibrated according to the rotating speed and the throttle opening degree of the methanol-diesel oil dual-fuel engine through bench tests.
Preferably, the diesel injection mode includes a single injection and a double injection in which the increase or decrease of the diesel injection amount occurs only in the main injection period.
Preferably, the vibration signal V when the engine knocks in the diesel injection modepThe maximum value of (a) is calibrated by bench tests.
Preferably, the methanol-diesel dual-fuel engine increases or decreases the diesel supply by 0.5-1 mg and simultaneously decreases or increases the methanol supply by 1.1-2.2 mg when injecting fuel.
A fuel supply closed-loop controller of an electric control methanol-diesel dual-fuel engine for a vehicle comprises a knock determination module and a fuel injection quantity adjusting module; the knock determination module is used for determining the occurrence of knock according to the knock characteristic frequency of the engine body in different diesel injection modes, the fuel injection quantity adjustment module is used for synchronously adjusting the injection quantities of methanol and diesel, so that the methanol substitution rate of the engine is maximized and the engine can be quickly separated from the knock, and the knock characteristic frequency is the frequency of enhancing the vibration energy density of the engine body when the knock occurs.
Preferably, the controller further comprises a non-resonance type knock sensor and a filtering module, the non-resonance type knock sensor is arranged on the methanol-diesel dual-fuel engine body, and the filtering module is used for filtering a detection signal of the non-resonance type knock sensor according to a knock characteristic frequency in a selected diesel injection mode.
Preferably, the knock determination module is configured to compare the vibration signal v obtained through the filtering by the filtering module with a vibration signal v obtained through the same filtering when the engine knocks in the diesel injection modepCarrying out comparison; if the comparison result is that v is greater than vpIs determined as knocking occurrence.
The invention has the beneficial effects that:
the invention adjusts the injection quantity of the methanol and the diesel oil under the corresponding injection strategy according to the vibration characteristic signals subjected to filtering processing of different frequencies, so that the injection quantity of the methanol and the diesel oil is dynamically adjusted according to whether the engine knocks, thereby improving the utilization rate of the methanol to the maximum extent and reducing the running cost of the engine. The vibration characteristic signal is adopted to judge the occurrence of the knocking, so that the knocking can be separated as soon as possible after the engine knocks, the time for the engine to be damaged by the knocking is reduced, and the use reliability of the engine is improved.
Furthermore, the method adopts a non-resonance knock sensor to match two sets of filters with different filtering frequencies (respectively corresponding to single spraying and double spraying) to judge the knock of the methanol-diesel dual-fuel engine, and has accurate judgment and low cost.
Drawings
FIG. 1 is a frequency distribution graph of a test methanol-diesel dual-fuel engine body vibration acceleration power density detected by a universal vibration sensor; wherein: (a) single injection; (b) and (4) performing double spraying.
FIG. 2 is a flow chart of a knock closed-loop control algorithm of the methanol-diesel dual-fuel engine.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
According to tests, the methanol-diesel dual-fuel engine can generate a knocking phenomenon when the methanol substitution rate is too high, and the engine body vibration characteristic frequency is obviously different during knocking according to different diesel injection times. As shown in fig. 1, when the dual injection strategy is adopted, the frequency range of the enhanced body vibration energy density is obviously improved compared with the single injection strategy after the methanol substitution rate is too high and knocking occurs. That is to say, when the methanol-diesel dual-fuel engine knocks, the frequency range of the enhancement of the body vibration energy density is different due to different diesel injection strategies (single injection or double injection), and for different diesel injection strategies, a corresponding vibration characteristic frequency can be selected from the frequency range of the enhancement of the body vibration energy density (influence of engine working conditions on the vibration characteristic frequency can be ignored), so that knocking occurrence under different working conditions and different diesel injection strategies of the dual-fuel engine can be judged. It is clear that a non-resonant sensor using a resonant knock sensor or single channel filtering is not able to detect different vibration signature frequencies for different diesel injection strategies.
Based on the above content, the invention provides a knock-based fuel supply closed-loop control strategy for the methanol-diesel dual-fuel engine for the vehicle. The strategy is closed-loop control targeting methanol and diesel injection quantities; the strategy takes the opening and the rotating speed of an engine throttle valve as input quantities, so as to determine the number of times of diesel oil injection of the engine and the basic injection quantity of the diesel oil and the methanol; the feedback signal of the strategy is output voltage V obtained by filtering and amplifying a non-resonance type knock sensor, and under different diesel injection strategies, the maximum output voltage V is obtained by filtering and amplifying the same V as the maximum output voltage V obtained by filtering and amplifying the non-resonance type knock sensor when the dual-fuel engine knocksPL(single injection) or VPH(double injection) comparison (V)PLAnd VPHPre-calibrated), whether knocking occurs is judged, and the methanol and diesel injection quantity of the dual-fuel engine is corrected according to different judgment results.
Based on the closed-loop control strategy, the invention provides a fuel supply closed-loop control method of a vehicle methanol-diesel dual-fuel engine based on knocking, which comprises the following steps:
in order to realize closed-loop control of fuel supply (methanol substitution rate), the invention utilizes a non-resonance type knock sensor, and uses filters with different passing frequencies to process sensor signals under different diesel injection modes (single injection or double injection), extracts vibration signals of an engine body under knock characteristic frequency corresponding to the diesel injection mode, judges knock, synchronously adjusts fuel injection quantity and injection ratio according to heat values of methanol and diesel, and finally quickly departs from a knock state on the premise of ensuring stable working condition of the engine and maximum methanol substitution rate.
The implementation process of the fuel supply closed-loop control method is as follows:
1) bench test calibration
Knocking characteristic frequency: through a bench test, a general vibration sensor is used for measuring the frequency range of vibration energy density enhancement of a target methanol-diesel dual-fuel engine when an engine body knocks in a single injection mode and a double injection mode respectively, and the vibration characteristic frequency is selected from the frequency range, so that the knocking characteristic frequency is obtained;
a non-resonance type knock sensor (the installation position of which is consistent with that of the general vibration sensor) is installed on the engine cylinder body, and the signal output end of the non-resonance type knock sensor is connected with two sets of band-pass filters F with different passing frequenciesH(e.g., a pass frequency of 7200 or 9100Hz) and FL(for example, the pass frequency is 4100Hz), and a filter for processing a non-resonance knock sensor signal (charge amount) is selected according to the diesel injection mode (F is selected in the single injection mode)LSelection of F in the double injection modeH) The processed signal is amplified into a voltage signal by a charge amplifying element and is output to the ECU; accordingly, the maximum output voltage V corresponding to the non-resonance knock sensor signal when the target methanol-diesel dual-fuel engine knocks is calibrated in different diesel injection modesPL(single injection) or VPH(double injection);
calibrating the diesel basic injection quantity and the methanol basic injection quantity of the target methanol-diesel dual-fuel engine through a bench test according to the engine speed and the accelerator opening; the calibration of the base injection amount may be referred to as the way of the calibration MAP.
2) Algorithm flow of engine fuel supply closed-loop control during vehicle running (see FIG. 2)
2.1) in the nth cycle of the target methanol-diesel dual-fuel engine, determining the working condition of the engine by the ECU according to the current rotating speed and the opening degree of an accelerator of the engine, and obtaining the diesel injection mode of the engine and the basic injection amounts X and Y of diesel and methanol by looking up a table;
2.2) according to a diesel injection mode, filtering a non-resonance knock sensor signal by using a corresponding band-pass filter, and amplifying the signal into an output voltage signal;
2.3) after the knock sensor signal is processed, the ECU outputs the voltage V and the calibrated VPL(or V)PH) Carrying out comparison;
2.4) if V > VPL(or V > V)PH) Considering that knocking occurs at this time, according to the heat value calculation of methanol (19.66MJ/kg) and diesel oil (42.5MJ/kg), increasing the diesel oil supply of 1mg/cycle in the fuel injection of the next cycle, and simultaneously reducing the methanol supply of 2.2mg/cycle (the methanol and the diesel oil are synchronously adjusted to stabilize the working condition of the engine); on the contrary, it is considered that knocking did not occur, and the diesel supply of 1mg/cycle was decreased while the methanol supply of 2.2mg/cycle was increased in the fuel injection of the next cycle;
2.5) repeating steps 2.1) to 2.4) in the (n + 1) th cycle.
It is to be noted that in the dual injection mode, the variation in the diesel fuel supply amount occurs only in the main injection period, thereby making the control simpler.
The invention has the following characteristics:
1) under the condition that the working condition is not changed, the injection quantity of the methanol and the diesel oil is rapidly and dynamically changed, but is not fixedly inquired according to a MAP table and subjected to interpolation calculation;
2) under different diesel injection strategies, the signals of the knock sensor are processed and judged differently, so that the knock can be judged more accurately;
3) only one non-resonance knock sensor needs to be installed, so that the cost is low and the installation is convenient.
In a word, the invention adjusts the injection quantity of the methanol and the diesel according to the non-resonance type knock sensor signals filtered by different frequencies, thereby avoiding the knock phenomenon as much as possible on the premise of ensuring the maximum methanol utilization rate and improving the use economy and reliability of the methanol-diesel dual-fuel engine.
Claims (8)
1. A fuel supply closed-loop control method for an automotive electric control methanol-diesel dual-fuel engine is characterized by comprising the following steps: the closed-loop control method comprises the following steps:
the method comprises the steps of judging the occurrence of the knock according to knock characteristic frequency of an engine body in different diesel injection modes, adjusting the injection amount of methanol and diesel by reducing or increasing the methanol injection amount and correspondingly increasing or reducing the diesel injection amount under the condition of keeping the working condition of the engine stable according to the heat values of the methanol and the diesel, maximizing the methanol substitution rate of the engine and quickly breaking away from the knock, wherein the knock characteristic frequency is the frequency of enhancing the vibration energy density of the engine body when the knock occurs.
2. The fuel supply closed-loop control method for the vehicle electric control methanol-diesel dual-fuel engine according to claim 1, characterized in that: the closed-loop control method specifically comprises the following steps:
1) determining the working condition of the engine and the basic injection quantity of diesel and methanol according to the current rotating speed and the opening degree of an accelerator of the methanol-diesel dual-fuel engine;
2) according to the current diesel injection mode of the methanol-diesel dual-fuel engine, filtering a vibration signal detected by a non-resonance type knock sensor arranged on a body of the methanol-diesel dual-fuel engine to obtain a vibration signal v of the engine under the knock characteristic frequency of the diesel injection mode;
3) the vibration signal v obtained after the processing of the step 2) and the vibration signal v obtained after the same filtering processing when the engine knocks under the diesel injection mode are adoptedpCarrying out comparison;
4) if v is greater than vpThe maximum value of the methanol injection amount is judged to be knocking, and under the condition that the working condition of the engine is kept stable, the methanol injection amount is reduced, and the diesel injection amount is increased to adjust the corresponding basic injection amount so as to eliminate the knocking; otherwise, the corresponding basic injection quantity is adjusted by increasing the methanol injection quantity and reducing the diesel injection quantity so as to improve the methanol substitution rate.
3. The fuel supply closed-loop control method for the vehicle electric control methanol-diesel dual-fuel engine according to claim 2, characterized in that: the basic injection quantity of the diesel oil and the methanol is calibrated according to the rotating speed and the opening degree of an accelerator of the methanol-diesel oil dual-fuel engine through a bench test.
4. The fuel supply closed-loop control method for the vehicle electric control methanol-diesel dual-fuel engine according to claim 2, characterized in that: the diesel injection mode includes a single injection and a double injection in which an increase or decrease in the diesel injection amount occurs in the main injection period.
5. The fuel supply closed-loop control method for the vehicle electric control methanol-diesel dual-fuel engine according to claim 1 or 2, characterized by comprising the following steps: when the methanol-diesel dual-fuel engine is used for fuel injection, the methanol supply of 1.1-2.2 mg is correspondingly reduced or increased when the diesel supply of 0.5-1 mg is increased or reduced.
6. A fuel supply closed-loop controller of an electric control methanol-diesel dual-fuel engine for a vehicle is characterized in that: the controller includes a knock determination module and a fuel injection amount adjustment module; the knock determination module is used for determining knock occurrence according to knock characteristic frequency of an engine body in different diesel injection modes, the fuel injection quantity adjustment module is used for adjusting the injection quantities of methanol and diesel by reducing or increasing the methanol injection quantity and correspondingly increasing or reducing the diesel injection quantity under the condition of keeping the working condition of the engine stable, so that the methanol substitution rate of the engine is maximized and the engine can be quickly separated from the knock, and the knock characteristic frequency is frequency of vibration energy density enhancement of the engine body when the knock occurs.
7. The fuel supply closed-loop controller for the vehicle electric control methanol-diesel dual-fuel engine according to claim 6, characterized in that: the controller further comprises a non-resonance type knock sensor and a filtering module, the non-resonance type knock sensor is arranged on the methanol-diesel dual-fuel engine body, and the filtering module is used for filtering detection signals of the non-resonance type knock sensor according to knock characteristic frequency under a selected diesel injection mode.
8. The fuel supply closed-loop controller for the vehicle electric control methanol-diesel dual-fuel engine according to claim 7, characterized in that: the knock determination module is used for obtaining a vibration signal v after being processed by the filtering module and a vibration signal v obtained after the same filtering processing when the engine knocks in the diesel injection modepCarrying out comparison; if the comparison result is that v is greater than vpIs determined as knocking occurrence.
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| CN110043385A (en) * | 2019-04-17 | 2019-07-23 | 合肥锐智科技有限责任公司 | A kind of methanol based on CAN and diesel oil two-way ejection control method |
| CN110259575A (en) * | 2019-06-25 | 2019-09-20 | 北京理工大学 | Methanol diesel-oil engine and its scaling method |
| CN111365134A (en) * | 2020-03-31 | 2020-07-03 | 潍柴重机股份有限公司 | Method and system for calculating substitution rate of dual-fuel engine |
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