CN108825391B - Device for improving transient response of natural gas engine and response method thereof - Google Patents
Device for improving transient response of natural gas engine and response method thereof Download PDFInfo
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- CN108825391B CN108825391B CN201810752387.4A CN201810752387A CN108825391B CN 108825391 B CN108825391 B CN 108825391B CN 201810752387 A CN201810752387 A CN 201810752387A CN 108825391 B CN108825391 B CN 108825391B
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- 230000004044 response Effects 0.000 title claims abstract description 85
- 230000001052 transient effect Effects 0.000 title claims abstract description 61
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 44
- 239000003345 natural gas Substances 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007789 gas Substances 0.000 claims abstract description 52
- 239000002737 fuel gas Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 5
- 239000000446 fuel Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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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
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/44—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
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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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- 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
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
Landscapes
- 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)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a device for improving the transient response of a natural gas engine, which comprises an air inlet main pipe, a normal air supply channel, a gas supply pipe and a gas injection valve, wherein the normal air supply channel is also communicated with the transient response air supply channel, and further comprises an accelerator position sensor for detecting the opening degree of an accelerator pedal and a rotating speed sensor for detecting the rotating speed of the engine; also disclosed is a response method of the device; when the ECU judges that transient response is needed according to each detection parameter, the ECU provides fuel gas by using the transient response air supply channel, and simultaneously opens an anti-surge valve to discharge air, thereby improving air supply, rapidly improving air inflow of the engine in a short time and improving transient response performance of the engine.
Description
Technical Field
The invention relates to a device for improving transient response of a natural gas engine, and also relates to a specific response method of the device.
Background
The existing commonly used natural gas engines are mostly mixed by single-point injection and air inlet pipes, because of the combustion characteristics of natural gas, the air-fuel ratio needs to be controlled more precisely, the effect of instant multi-injection of natural gas is limited, and the disadvantages of transient response cannot be completely overcome. Therefore, the air intake is the key for improving the transient response, but due to the influence of the supercharging hysteresis, the air input of the engine is slowly increased, compared with the common transient response of a diesel engine, the phenomenon is particularly obvious under the working condition that rapid acceleration and loading are required, and the phenomenon mainly causes the following problems:
(1) Motor vehicles using natural gas engines start and accelerate relatively slowly;
(2) Engineering machinery such as an excavator and a loader using a natural gas engine is poor in loading characteristic.
It is therefore necessary to improve the transient response of natural gas engines in order to eliminate the above drawbacks and to optimize the mechanical characteristics of the motor vehicles, engineering machines, etc. in which the natural gas engines are used.
Disclosure of Invention
The invention aims to provide a device for improving transient response of a natural gas engine, which is used for improving air feeding and improving engine operation stability.
In order to solve the technical problems, the technical scheme of the invention is as follows: the device for improving the transient response of the natural gas engine comprises an air inlet main pipe connected to the engine, wherein an air inlet end of the air inlet main pipe is connected with a normal air supply channel, a gas supply pipe is communicated with the normal air supply channel, a gas injection valve is connected in series with the gas supply pipe, an air outlet end of the air inlet main pipe is connected to a cylinder of the engine, the normal air supply channel is also communicated with a transient response air supply channel, the device further comprises an accelerator position sensor for detecting the opening degree of an accelerator pedal and a rotation speed sensor for detecting the rotation speed of the engine, and the normal air supply channel, the transient response air supply channel, the accelerator position sensor and the rotation speed sensor are respectively connected to an electronic control unit ECU of the engine;
the normal air supply channel comprises an air supply pipe, a throttle valve is arranged on the air supply pipe, a gas mixer is arranged on the air supply pipe at the air outlet side of the throttle valve, the gas supply pipe is communicated with the gas mixer, an anti-surge exhaust pipe is communicated with the air supply pipe at the air inlet side of the throttle valve, an anti-surge valve is arranged on the anti-surge exhaust pipe, and the anti-surge valve and the throttle valve are respectively connected to the electronic control unit ECU in a signal mode;
the transient response air supply channel comprises an air compressor, an air outlet end of the air compressor is connected with an air storage tank, the air storage tank is communicated to the air supply pipe of the air outlet side of the throttle valve through a pipeline, a pressure sensor is installed in the air storage tank, an air inlet valve is installed on a pipeline of the air inlet end of the air storage tank, an air outlet valve is installed on a pipeline of the air outlet end of the air storage tank, and the pressure sensor, the air inlet valve and the air outlet valve are respectively connected to an electronic control unit ECU.
As a preferable technical scheme, the anti-surge valve and the air inlet valve are respectively arranged as switch type valves, and the air outlet valve is arranged as an opening adjustable valve.
As a preferable technical scheme, the air compressor is a compressor on the engine.
As a preferred technical solution, the air compressor is a stand alone compressor, and the air compressor is connected to the power output end of the engine in a belt transmission manner.
The invention also provides a response method of the device for improving the transient response of the natural gas engine, which comprises the following steps,
step one, starting the engine and the electronic control unit ECU;
step two, the pressure sensor detects the air pressure in the air storage tank in real time and transmits a pressure signal to the electronic control unit ECU, a pressure standard value is stored in the electronic control unit ECU, and when the electronic control unit ECU judges that the detected pressure signal is greater than the pressure standard value, the next step is carried out; otherwise, the ECU controls the air inlet valve to be opened, and the air compressor is utilized to charge and pressurize the air storage tank and operates according to the normal response of the throttle;
detecting an opening signal of an accelerator pedal in real time by the accelerator position sensor, transmitting the opening signal to the electronic control unit ECU, storing an opening signal standard value in the electronic control unit ECU, and entering the next step when the electronic control unit ECU judges that the detected opening signal is smaller than the opening signal standard value; otherwise, operating according to the normal response of the throttle;
step four, the electronic control unit ECU calculates the pedal change rate according to the accelerator pedal opening signal received in real time and according to the accelerator pedal opening signal, a pedal change rate standard value is stored in the electronic control unit ECU, and when the pedal change rate is more than or equal to the pedal change rate standard value, the next step is carried out; otherwise, operating according to the normal response of the throttle;
step five, the rotational speed sensor detects the rotational speed of the engine in real time and transmits a rotational speed signal to the electronic control unit ECU, a rotational speed signal standard value is stored in the electronic control unit ECU, and when the electronic control unit ECU judges that the detected rotational speed signal is larger than the rotational speed standard value, the next step is carried out; otherwise, operating according to the normal response of the throttle;
step six, the electronic control unit ECU judges that the engine needs to enter a transient response state, namely:
controlling the throttle valve to be closed, opening the anti-surge valve, and discharging air entering the normal air supply channel through the anti-surge exhaust pipe; simultaneously opening the air inlet valve and the air outlet valve to enable compressed air in the air storage tank to flow into the air inlet main pipe, mixing the compressed air with fuel gas introduced by the fuel gas supply pipe in the gas mixer, and enabling the mixed gas to enter a cylinder of an engine to ignite fuel to do work; in the process, the air pressure in the air storage tank is higher, the electronic control unit ECU controls the opening degree of the air outlet valve to change, so that the pressure of the air inlet manifold reaches and is maintained at a target value, the supercharging hysteresis is avoided, the engine can output larger torque in a short time, and one-time transient response of the engine is completed;
and step seven, after the transient response is completed, the electronic control unit ECU controls the air outlet valve to be closed, simultaneously controls the anti-surge valve to be closed, and the throttle valve is gradually opened, so that the engine is smoothly transited to a normal throttle response running state, and simultaneously, the monitoring of the electronic control unit ECU jumps to the step two for circulation.
As a preferable technical scheme, the standard value of the opening signal can be set to be any one percentage value of 25-35%; the standard value of the pedal change rate is at least 100%/s.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: when the electronic control unit ECU judges that transient response is needed according to each detection parameter, the engine enters a transient response air supply state, namely the transient response air supply channel is used for supplying fuel gas, and meanwhile, an anti-surge valve is opened to discharge air which is continuously introduced, so that air supply is improved, the air input of the engine is quickly improved in a short time, and the transient response performance of the engine is improved; in addition, through optimizing the matching of the air compressor, the compressed air storage space is increased, and the control of the throttle valve and the anti-surge valve is matched, so that the transient response characteristic of the engine is improved, the action time is continuous and short, and the air supply of the engine is seamlessly switched back to the normal air inlet state after the transient response is finished, so that the loading characteristic of the gas engine machinery is optimized.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 is a simple control flow chart of the electronic control unit ECU of the embodiment of the present invention;
in the figure: 1-an air inlet main pipe; 2-a gas injection valve; 3-gas mixer; 4-an engine; 5-throttle position sensor; 6-a rotation speed sensor; 7-an electronic control unit ECU; 8-an air supply pipe; 9-throttle valve; 10-an anti-surge exhaust pipe; 11-an anti-surge valve; 12-an air compressor; 13-a gas storage tank; 14-a pressure sensor; 15-an air inlet valve; 16-an air outlet valve; 17-a gas storage tank for the whole vehicle.
Detailed Description
The invention is further illustrated in the following, in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is needless to say that the person skilled in the art realizes that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive in scope.
As shown in fig. 1 and 2, the device for improving the transient response of the natural gas engine comprises an air inlet main pipe 1 connected to an engine 4, wherein an air inlet end of the air inlet main pipe 1 is connected with a normal air supply channel, a gas supply pipe is communicated with the normal air supply channel, a gas injection valve 2 is connected in series with the gas supply pipe, an air outlet end of the air inlet main pipe 1 is connected to a cylinder of the engine 4, and the normal air supply channel is also communicated with the transient response air supply channel. Under normal conditions, the normal air supply channel provides air for the engine 4 and is mixed with the fuel gas sent by the fuel gas supply pipe to enter the air inlet header pipe 1 so as to be used for combustion work of the engine 4; when the engine needs transient response, air is supplied by the transient response air supply passage, and two air intake routes are formed at the air intake end of the engine 4.
The engine transient response characteristic is to be improved, an accelerator position sensor 5 for detecting the opening degree of an accelerator pedal and a rotating speed sensor 6 for detecting the rotating speed of the engine are also needed, the normal air supply channel, the transient response air supply channel, the accelerator position sensor 5 and the rotating speed sensor 6 are respectively connected to an electronic control unit ECU7 of the engine 4, the engine 4 needs to normally run or needs transient response in the running process, the electronic control unit ECU7 carries out calculation processing according to the accelerator pedal position signal, the rotating speed signal of the engine and the like, and finally obtains a control command, and the normal air supply channel and the corresponding parts in the transient response air supply channel are controlled to be matched in an action mode, so that the seamless conversion of the working state is completed. The manner of signal communication between the sensors and the ECU7 and the structural principle of the ECU7 are well known to those skilled in the art, and will not be described in detail herein.
Specifically, the normal air supply channel includes air supply pipe 8, install throttle valve 9 on the air supply pipe 8, install gas blender 3 on the air supply pipe 8 of throttle valve 9 air outlet side, gas supply pipe intercommunication is in on the gas blender 3, the intercommunication has anti-surge blast pipe 10 on the air supply pipe 8 of throttle valve 9 air inlet side, install anti-surge valve 11 on the anti-surge blast pipe 10, anti-surge valve 11 is the switch type valve, anti-surge valve 11 with throttle valve 9 respectively signal connection to automatically controlled unit ECU7. In a normal operation state, the throttle valve 9 is opened and the opening degree is adjusted in real time according to the operation state of the engine 4, the anti-surge valve 11 is closed to avoid air loss, when a transient response is required, the electronic control unit ECU7 can control the throttle valve 9 to be closed and control the anti-surge valve 11 to be opened, the continuously input air is released, the transient response is prevented from being disturbed, and the response accuracy is improved.
The transient response air supply channel of this embodiment includes air compressor 12, air compressor 12's end of giving vent to anger is connected with gas holder 13, gas holder 13 is through the pipeline intercommunication to on the gas blender 3, install pressure sensor 14 in the gas holder 13, install air inlet valve 15 on the pipeline of gas holder 13 inlet end, install air outlet valve 16 on the pipeline of gas holder 13 outlet end, pressure sensor 14 air inlet valve 15 with air outlet valve 16 is connected to respectively electronic control unit ECU7, air inlet valve 15 sets up to the switch type valve, air outlet valve 16 sets up to the adjustable valve of aperture. In normal operation, the air outlet valve 16 is closed, and the electronic control unit ECU7 adjusts the opening and closing of the air inlet valve 15 according to the signal detected by the pressure sensor 14, so as to adjust the air pressure of the air storage tank 13, so as to ensure that the air storage tank 13 can have enough air to complete the response task in transient response. Each valve is an electronic valve and can be correspondingly opened and closed according to the received control signal of the electronic control unit ECU7.
The air compressor 12 may be provided as a compressor onboard the engine 4; of course, the air compressor 12 may also be provided as a stand alone compressor, the air compressor 12 being belt driven connected to the power take off of the engine 4. And a gas storage tank 17 for the whole vehicle can be arranged in parallel with the gas storage tank 13 and used for gas braking of the whole vehicle.
The specific response method of the device for improving the transient response of the natural gas engine comprises the following steps of:
step one, starting the engine 4 and the electronic control unit ECU7.
Step two, the pressure sensor 14 detects the air pressure in the air storage tank 13 in real time and transmits a pressure signal to the electronic control unit ECU7, a pressure standard value is stored in the electronic control unit ECU7 and can be properly adjusted according to control precision, and when the electronic control unit ECU7 judges that the detected pressure signal is greater than the pressure standard value, the next step is carried out; otherwise, the electronic control unit ECU7 controls the air inlet valve 15 to be opened, and the air compressor 12 is utilized to charge and pressurize the air storage tank 13 and operates according to the normal response of the throttle.
Step three, the throttle position sensor 5 detects the opening signal of the throttle pedal in real time and transmits the opening signal to the electronic control unit ECU7, an opening signal standard value is stored in the electronic control unit ECU7, and when the electronic control unit ECU7 judges that the detected opening signal is smaller than the opening signal standard value, the next step is carried out; otherwise, the throttle is operated according to the normal response of the throttle. The standard value of the opening signal may be set to any one of 25 to 35%, and in this embodiment, the standard value of the opening signal is set to 30%, and when the ECU7 determines that the detected opening signal is less than 30%, the process proceeds to the next step.
Step four, the electronic control unit ECU7 calculates the pedal change rate according to the accelerator pedal opening signal received in real time and according to the accelerator pedal opening signal, a pedal change rate standard value is stored in the electronic control unit ECU, and when the pedal change rate is more than or equal to the pedal change rate standard value, the next step is carried out; otherwise, the accelerator is operated according to the normal response, and in the step, the standard value of the pedal change rate is at least 100%/s.
Step five, the rotation speed sensor 6 detects the rotation speed of the engine in real time and transmits a rotation speed signal to the electronic control unit ECU7, a rotation speed signal standard value is stored in the electronic control unit ECU7, the rotation speed signal standard value can be properly adjusted according to control precision, and when the electronic control unit ECU7 judges that the detected rotation speed signal is greater than the rotation speed standard value, the next step is carried out; otherwise, the throttle is operated according to the normal response of the throttle.
Step six, the electronic control unit ECU7 determines that the engine 4 needs to enter a transient response state, that is: controlling the throttle valve 9 to be closed, opening the anti-surge valve 11, and discharging air entering the normal air supply channel through the anti-surge exhaust pipe 10; simultaneously, the air inlet valve 15 and the air outlet valve 16 are opened, so that the compressed air in the air storage tank 13 flows into the air inlet manifold 1, the compressed air is mixed with the fuel gas introduced by the fuel gas supply pipe in the gas mixer 3, the mixed gas then enters a cylinder of the engine 4 to ignite fuel to do work, the air pressure in the air storage tank 13 is higher in the process, the electronic control unit ECU7 controls the opening degree of the air outlet valve 16 to change, the pressure of the air inlet manifold 1 reaches and maintains at a target value, the delay of supercharging is avoided, the engine can output larger torque in a short time, and one transient response of the engine is completed.
And step seven, after the transient response is completed, the electric control unit ECU7 controls the air outlet valve 16 to be closed, simultaneously controls the anti-surge valve 11 to be closed, and the throttle valve 9 is gradually opened, so that the engine smoothly transits to a normal throttle response running state, and simultaneously the monitoring of the electric control unit ECU7 jumps to the step two circulation.
When the engine is in normal operation, the normal air supply channel is used for supplying fuel gas to the engine, and when the electronic control unit ECU7 judges that transient response is required according to each detection parameter, the engine enters a transient response air supply state, namely the transient response air supply channel is used for supplying fuel gas, and meanwhile, the anti-surge valve 11 is opened to discharge air which is continuously introduced, so that the air supply is improved, the air input of the engine is quickly improved in a short time, and the transient response performance of the engine is improved; in addition, through optimizing the matching of the air compressor 12, the compressed air storage space is increased, and the control of the throttle valve 9 and the anti-surge valve 11 is matched, so that the transient response characteristic of the engine is improved, the action time is short, and the air supply of the engine is switched back to the normal air inlet state after the transient response is finished, so that the loading characteristic of the gas engine machinery is optimized.
The foregoing has shown and described the basic principles, main features and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method of responding to an apparatus for enhancing transient response in a natural gas engine comprising an intake manifold coupled to the engine, the method comprising: the gas inlet end of the gas inlet main pipe is connected with a normal gas supply channel, the normal gas supply channel is communicated with a gas supply pipe, the gas supply pipe is connected with a gas injection valve in series, the gas outlet end of the gas inlet main pipe is connected to a cylinder of an engine, the normal gas supply channel is also communicated with a transient response gas supply channel, and the normal gas supply channel further comprises a throttle position sensor for detecting the opening degree of a throttle pedal and a rotating speed sensor for detecting the rotating speed of the engine, and the normal gas supply channel, the transient response gas supply channel, the throttle position sensor and the rotating speed sensor are respectively connected to an electronic control unit ECU of the engine;
the normal air supply channel comprises an air supply pipe, a throttle valve is arranged on the air supply pipe, a gas mixer is arranged on the air supply pipe at the air outlet side of the throttle valve, the gas supply pipe is communicated with the gas mixer, an anti-surge exhaust pipe is communicated with the air supply pipe at the air inlet side of the throttle valve, an anti-surge valve is arranged on the anti-surge exhaust pipe, and the anti-surge valve and the throttle valve are respectively connected to the electronic control unit ECU in a signal mode;
the transient response air supply channel comprises an air compressor, an air outlet end of the air compressor is connected with an air storage tank, the air storage tank is communicated to the air mixer through a pipeline, a pressure sensor is installed in the air storage tank, an air inlet valve is installed on a pipeline of an air inlet end of the air storage tank, an air outlet valve is installed on a pipeline of an air outlet end of the air storage tank, and the pressure sensor, the air inlet valve and the air outlet valve are respectively connected to the electronic control unit ECU;
the response method of the device for improving the transient response of the natural gas engine comprises the following steps,
step one, starting the engine and the electronic control unit ECU;
step two, the pressure sensor detects the air pressure in the air storage tank in real time and transmits a pressure signal to the electronic control unit ECU, a pressure standard value is stored in the electronic control unit ECU, and when the electronic control unit ECU judges that the detected pressure signal is greater than the pressure standard value, the next step is carried out; otherwise, the ECU controls the air inlet valve to be opened, and the air compressor is utilized to charge and pressurize the air storage tank and operates according to the normal response of the throttle;
detecting an opening signal of an accelerator pedal in real time by the accelerator position sensor, transmitting the opening signal to the electronic control unit ECU, storing an opening signal standard value in the electronic control unit ECU, and entering the next step when the electronic control unit ECU judges that the detected opening signal is smaller than the opening signal standard value; otherwise, operating according to the normal response of the throttle;
step four, the electronic control unit ECU calculates the pedal change rate according to the accelerator pedal opening signal received in real time and according to the accelerator pedal opening signal, a pedal change rate standard value is stored in the electronic control unit ECU, and when the pedal change rate is more than or equal to the pedal change rate standard value, the next step is carried out; otherwise, operating according to the normal response of the throttle;
step five, the rotational speed sensor detects the rotational speed of the engine in real time and transmits a rotational speed signal to the electronic control unit ECU, a rotational speed signal standard value is stored in the electronic control unit ECU, and when the electronic control unit ECU judges that the detected rotational speed signal is larger than the rotational speed standard value, the next step is carried out; otherwise, operating according to the normal response of the throttle;
step six, the electronic control unit ECU judges that the engine needs to enter a transient response state, namely:
controlling the throttle valve to be closed, opening the anti-surge valve, and discharging air entering the normal air supply channel through the anti-surge exhaust pipe; simultaneously opening the air inlet valve and the air outlet valve to enable compressed air in the air storage tank to flow into the air inlet main pipe, mixing the compressed air with fuel gas introduced by the fuel gas supply pipe in the gas mixer, and enabling the mixed gas to enter a cylinder of an engine to ignite fuel to do work; in the process, the air pressure in the air storage tank is higher, the electronic control unit ECU controls the opening degree of the air outlet valve to change, so that the pressure of the air inlet manifold reaches and is maintained at a target value, the supercharging hysteresis is avoided, the engine can output larger torque in a short time, and one-time transient response of the engine is completed;
and step seven, after the transient response is completed, the electronic control unit ECU controls the air outlet valve to be closed, simultaneously controls the anti-surge valve to be closed, and the throttle valve is gradually opened, so that the engine is smoothly transited to a normal throttle response running state, and simultaneously, the monitoring of the electronic control unit ECU jumps to the step two for circulation.
2. A method of responding to an apparatus for enhancing transient response of a natural gas engine as recited in claim 1, wherein: the anti-surge valve and the air inlet valve are respectively arranged as switch type valves, and the air outlet valve is arranged as an opening adjustable valve.
3. A method of responding to an apparatus for enhancing transient response of a natural gas engine as claimed in claim 1 or claim 2, wherein: the air compressor is a compressor on the engine.
4. A method of responding to an apparatus for enhancing transient response of a natural gas engine as claimed in claim 1 or claim 2, wherein: the air compressor is a stand alone compressor, and the air compressor is belt driven to connect to the power output end of the engine.
5. A method of responding to an apparatus for enhancing transient response of a natural gas engine as recited in claim 1, wherein: the standard value of the opening signal can be set to be any one percentage value of 25-35%;
the standard value of the pedal change rate is at least 100%/s.
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| CN201810752387.4A CN108825391B (en) | 2018-07-10 | 2018-07-10 | Device for improving transient response of natural gas engine and response method thereof |
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| CN201810752387.4A CN108825391B (en) | 2018-07-10 | 2018-07-10 | Device for improving transient response of natural gas engine and response method thereof |
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| CN108825391B true CN108825391B (en) | 2023-10-20 |
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| CN109826729A (en) * | 2019-01-08 | 2019-05-31 | 四川柯瑞泰内燃机制造有限公司 | A kind of engine intelligent variable compression ratio system and method |
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