CN111412058A - Methanol engine air intake control method and system - Google Patents
Methanol engine air intake control method and system Download PDFInfo
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- CN111412058A CN111412058A CN202010305734.6A CN202010305734A CN111412058A CN 111412058 A CN111412058 A CN 111412058A CN 202010305734 A CN202010305734 A CN 202010305734A CN 111412058 A CN111412058 A CN 111412058A
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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
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0493—Controlling the air charge temperature
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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
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
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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
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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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
- F02B2201/00—Fuels
- F02B2201/02—Liquid
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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
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
- F02D2200/0416—Estimation of air temperature
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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
- F02D2200/0614—Actual fuel mass or fuel injection amount
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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
- Y02T10/12—Improving ICE efficiencies
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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
Abstract
The invention provides a methanol engine air intake control method and system, and relates to the field of vehicle engines. The method comprises the steps of firstly collecting working state information of the engine, then determining the target air inlet temperature of the engine according to the working state information of the engine, then searching the opening degree of the bypass valve corresponding to the target air inlet temperature of the engine from a preset storage module, wherein the preset storage module stores the corresponding relation between the target air inlet temperature of the engine and the opening degree of the bypass valve in advance, and finally adjusting parameters of the bypass valve according to the searched opening degree of the bypass valve. According to the invention, the air inlet temperature of the engine is adjusted in real time by optimally controlling the air inlet system of the engine, so that the heat required by the gasification of the methanol fuel in the air inlet channel of the engine can be met to the greatest extent under different working conditions of the engine, the gasification of the methanol in the air inlet channel is improved, and the methanol fuel and air can be fully mixed under the action of air flow after the air inlet valve is opened and enters the air cylinder.
Description
Technical Field
The invention relates to the field of vehicle engines, in particular to a methanol engine air intake control method and system.
Background
With the steady development of economic construction in China, the contradiction between supply and demand of energy fuels is increasing day by day, and the problem of replacing fuels draws wide attention. In the process of seeking for alternative fuel, the methanol fuel shows unique advantages, and under the strong support of governments and local related departments, the research and development of the methanol fuel in China have achieved huge achievements through years of efforts.
The existing heavy methanol engine is developed by generally borrowing the existing mature heavy diesel engine base, and is generally an engine with six cylinders or more. Due to the methanol fuel properties, a gasoline-like combustion mode is generally used, and therefore the following technical route is adopted: injecting fuel oil in an air inlet channel, performing equivalence ratio combustion and performing spark ignition; in the development process of a heavy methanol engine, due to the characteristic that the latent heat of methanol fuel vaporization is large (1.1MJ/kg), a nozzle needs to be arranged on an air inlet channel or an air inlet manifold of a cylinder cover, and the methanol is injected in a closed state of an inlet valve, so that the methanol can fall at a position with a higher temperature in the air inlet channel as far as possible, and the methanol is fully vaporized and fully mixed with air before entering a cylinder.
In the process of developing the methanol engine, because the methanol engine has the characteristic of higher equivalence ratio than combustion and latent heat of methanol fuel gasification, in the actual methanol supply process, the methanol is injected in a closing state of an inlet valve, although the methanol injection falls on the high-temperature position of the inlet channel, because the heat value of the methanol is lower, the injection quantity of the methanol is about 2.19 times of that of the gasoline, and the latent heat of gasification is 3.5 times of that of the gasoline, a part of the methanol which is relatively large still adheres to the wall surface of the inlet channel in a liquid form, when the valve is opened, a part of the methanol enters a cylinder in a liquid drop form, the mixed gas cannot be fully mixed, the unburned methanol is higher in emission, and the economy and the emission performance of the engine are.
Disclosure of Invention
The invention aims to provide a methanol engine air inlet control method, which solves the problem that methanol fuel cannot be fully mixed with air in an engine cylinder in the prior art.
It is a further object of the first aspect of the present invention to improve the accuracy of the intake air temperature of the engine.
The invention provides a methanol engine air inlet control system.
According to an object of a first aspect of the present invention, there is provided a methanol engine intake control method comprising:
collecting the working state information of the engine;
determining a target intake air temperature of the engine according to the working state information of the engine;
searching a bypass valve opening corresponding to a target inlet air temperature of the engine from a preset storage module, wherein the preset storage module stores a corresponding relation between the target inlet air temperature of the engine and the bypass valve opening in advance;
and adjusting parameters of the bypass valve according to the searched opening degree of the bypass valve so as to change the air inlet temperature of the engine.
Optionally, after adjusting the parameter of the bypass valve according to the found opening of the bypass valve, the method further includes:
detecting an actual intake air temperature of the engine;
judging whether the actual air inlet temperature of the engine meets the target air inlet temperature or not;
if the parameter is not satisfied, the parameter of the bypass valve is adjusted again.
Optionally, if the parameter is not satisfied, performing parameter adjustment on the bypass valve again, specifically including:
when the actual air inlet temperature of the engine is lower than the target air inlet temperature, the opening degree of the bypass valve is adjusted to be larger than a first preset threshold value;
and when the actual air inlet temperature of the engine is higher than the target air inlet temperature, adjusting the opening of the bypass valve to be smaller than a second preset threshold value.
Optionally, the operating state information of the engine includes a methanol injection amount under the current operating condition of the engine and a knock parameter of the engine.
Optionally, when the methanol injection amount of the engine under the current working condition is not changed, the lower the knock parameter of the engine is, the higher the target intake air temperature of the engine is;
when the knock parameter of the engine is not changed, the more the methanol injection amount of the engine under the current working condition is, the higher the target air inlet temperature of the engine is.
According to the object of the second aspect of the invention, the invention also provides a methanol engine air inlet control system, which comprises a main loop formed by connecting an engine, a turbocharger, an intercooler and a throttle valve in sequence,
the turbocharger air control system further comprises a bypass valve, wherein the bypass valve is provided with an air inlet and an air outlet, the air inlet is connected with an outlet of the turbocharger, and the air outlet is connected with an air inlet of the throttle valve;
the detection unit is used for acquiring the working state information of the engine;
and the control unit is in signal connection with the detection unit and is used for receiving the working state information of the engine sent by the detection unit, determining the target air inlet temperature of the engine according to the working state information of the engine, searching the opening degree of a bypass valve corresponding to the target air inlet temperature of the engine from a preset storage module, wherein the preset storage module stores the corresponding relation between the target air inlet temperature of the engine and the opening degree of the bypass valve in advance, and finally performing parameter adjustment on the bypass valve according to the searched opening degree of the bypass valve to change the air inlet temperature of the engine, wherein the preset storage module and the bypass valve are both in signal connection with the control unit.
Alternatively,
the detection unit is also used for detecting the actual air inlet temperature of the engine and sending the actual air inlet temperature to the control unit;
the control unit is further used for adjusting the parameters of the bypass valve again when the actual air inlet temperature of the engine is judged not to meet the target air inlet temperature.
Alternatively,
the control unit is configured to adjust the opening degree of the bypass valve to be larger by a first preset threshold value when the actual intake air temperature of the engine is lower than the target intake air temperature, and to adjust the opening degree of the bypass valve to be smaller by a second preset threshold value when the actual intake air temperature of the engine is higher than the target intake air temperature.
Optionally, the operating state information of the engine includes a methanol injection amount under the current operating condition of the engine and a knock parameter of the engine.
Optionally, when the methanol injection amount of the engine under the current working condition is not changed, the lower the knock parameter of the engine is, the higher the target intake air temperature of the engine is;
when the knock parameter of the engine is not changed, the more the methanol injection amount of the engine under the current working condition is, the higher the target air inlet temperature of the engine is.
The method comprises the steps of firstly collecting working state information of the engine, then determining the target air inlet temperature of the engine according to the working state information of the engine, then searching the opening degree of a bypass valve corresponding to the target air inlet temperature of the engine from a preset storage module, wherein the preset storage module stores the corresponding relation between the target air inlet temperature of the engine and the opening degree of the bypass valve in advance, and finally adjusting parameters of the bypass valve according to the searched opening degree of the bypass valve so as to change the air inlet temperature of the engine. According to the invention, the air inlet temperature of the engine is adjusted in real time by optimally controlling the air inlet system of the engine, so that the heat required by the gasification of the methanol fuel in the air inlet channel of the engine can be met to the greatest extent under different working conditions of the engine, the gasification of the methanol in the air inlet channel is improved, the methanol fuel and air can be fully mixed under the action of air flow after the air inlet valve of the engine is opened and enters the air cylinder, and the economy and the emission performance of the engine are improved.
Further, the present invention detects the actual intake air temperature of the engine again after the bypass valve is parametrically adjusted, and parametrically adjusts the bypass valve again when the actual intake air temperature of the engine does not satisfy the target intake air temperature. The invention can improve the accuracy of the air inlet temperature of the engine, thereby enabling the methanol and the air to be mixed more uniformly.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic flow chart of a methanol engine air intake control method according to one embodiment of the present invention;
FIG. 2 is a schematic flow chart of a methanol engine air intake control method according to another embodiment of the present invention;
fig. 3 is a schematic configuration diagram of an intake control system of a methanol engine according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a schematic flow chart of a methanol engine intake control method according to an embodiment of the present invention. As shown, in one particular embodiment, the methanol engine air induction control method generally comprises the steps of:
s10, collecting working state information of the engine, wherein the working state information of the engine comprises methanol injection amount under the current working condition of the engine and a detonation parameter of the engine;
s20, determining the target air inlet temperature of the engine according to the working state information of the engine;
s30, searching the opening of the bypass valve corresponding to the target air inlet temperature of the engine from a preset storage module, wherein the preset storage module stores the corresponding relation between the target air inlet temperature of the engine and the opening of the bypass valve in advance;
and S40, adjusting parameters of the bypass valve according to the searched opening degree of the bypass valve so as to change the air inlet temperature of the engine.
The bypass valve in the prior art only plays a role of opening and closing, and the invention utilizes the existing bypass valve to control the opening degree of the bypass valve so as to adjust the air inlet temperature of the engine.
Furthermore, the air inlet temperature of the engine is adjusted in real time by optimally controlling the air inlet system of the engine, so that the heat required by the gasification of the methanol fuel in the air inlet channel of the engine can be met to the greatest extent under different working conditions of the engine, the gasification of the methanol in the air inlet channel is improved, the methanol fuel and air can be fully mixed under the action of air flow after the air inlet valve of the engine is opened and the methanol fuel and the air enter the air cylinder, and the economical efficiency and the emission performance of the engine are improved.
Fig. 2 is a schematic flow chart of a methanol engine intake control method according to another embodiment of the present invention. As shown in fig. 2, in another embodiment, after adjusting the parameters of the bypass valve according to the found opening degree of the bypass valve, the method further includes the following steps:
s50, detecting the actual air inlet temperature of the engine;
s60, judging whether the actual air inlet temperature of the engine meets the target air inlet temperature;
and S70, if the parameter is not satisfied, adjusting the parameter of the bypass valve again.
The invention can improve the accuracy of the air inlet temperature of the engine, thereby enabling the methanol and the air to be mixed more uniformly.
Further, if the parameter is not satisfied, the parameter adjustment is performed on the bypass valve again, and the method specifically comprises the following steps:
when the actual air inlet temperature of the engine is lower than the target air inlet temperature, the opening degree of the bypass valve is adjusted to be larger than a first preset threshold value, and when the actual air inlet temperature of the engine is higher than the target air inlet temperature, the opening degree of the bypass valve is adjusted to be smaller than a second preset threshold value, wherein the first preset threshold value and the second preset threshold value are set according to the specific working condition of the engine.
That is, according to the invention, the intake temperature of the engine is detected again after the opening of the bypass valve is adjusted, and when the intake temperature of the engine is deviated from the target intake temperature, the opening of the bypass valve is finely adjusted, that is, the opening of the bypass valve is corrected again, so that the intake temperature of the engine meets the intake temperature requirement of the engine under the current working condition, and further, the methanol and the air are mixed more fully.
Specifically, when the methanol injection amount of the engine under the current working condition is not changed, the lower the knock parameter of the engine is, the higher the target intake air temperature of the engine is; when the knock parameter of the engine is not changed, the more the methanol injection amount of the engine under the current working condition is, the higher the target intake air temperature of the engine is. That is, the higher the methanol injection amount, the better the target intake air temperature, but the higher the target intake air temperature, the higher the target intake air temperature may cause knocking in the engine cylinder. Therefore, it is necessary to comprehensively determine the target intake air temperature of the engine in combination with the methanol injection amount of the engine and the knock parameter of the engine.
Fig. 3 is a schematic configuration diagram of an intake control system of a methanol engine according to an embodiment of the present invention. As shown in fig. 3, in a specific embodiment, the present invention further provides a methanol engine intake control system 100, which includes a main loop formed by connecting an engine 1, a turbocharger 2, an intercooler 3 and a throttle valve 4 in sequence, and further includes a bypass valve 5, a detection unit 6 and a control unit 7, wherein the bypass valve 5 has an air inlet and an air outlet, the air inlet of the bypass valve 5 is connected to the outlet of the turbocharger 2, and the air outlet of the bypass valve is connected to the air inlet of the throttle valve 4. The detection unit 6 is used for collecting the working state information of the engine 1. The control unit 7 is in signal connection with the detection unit 6, and is configured to receive the working state information of the engine 1 sent by the detection unit 6, determine a target intake air temperature of the engine 1 according to the working state information of the engine 1, then search for an opening degree of the bypass valve 5 corresponding to the target intake air temperature of the engine 1 from a preset storage module 8, where the preset storage module 8 stores a correspondence relationship between the target intake air temperature of the engine 1 and the opening degree of the bypass valve 5 in advance, and finally perform parameter adjustment on the bypass valve 5 according to the searched opening degree of the bypass valve 5 to change the intake air temperature of the engine 1, where the preset storage module 8 and the bypass valve 5 are both in signal connection with the control unit 7. The detection unit 6 includes a temperature sensor provided between the intercooler 3 and the throttle valve 4, and the control unit 7 is an ECU controller.
According to the invention, by adding a bypass pipeline, an air inlet of the bypass pipeline is arranged behind the turbocharger 2 and in front of the intercooler 3, and an air outlet of the bypass pipeline is arranged behind the intercooler 3 and in front of the throttle valve 4. When the bypass valve 5 is opened, part of compressed air can directly reach the front of the throttle valve 4 through the bypass valve 5 without passing through the intercooler 3, and the intake loss is effectively reduced. In addition, the air temperature is detected by the detection unit 6 arranged in front of the throttle valve 4 and fed back to the control unit 7, the control unit 7 controls the opening of the bypass valve 5 according to the temperature signal, so that the air temperature in front of the throttle valve 4 is controlled, and finally the air inlet temperature of the engine 1 is optimally controlled according to the requirements of the engine 1 under different working conditions. Furthermore, part of the compressed air does not need to be cooled by the intercooler 3, so that the power of a fan can be properly reduced, the heat management of the whole vehicle is optimized, and the power loss of an intercooler part is reduced.
Specifically, the detection unit 6 is also used to detect the actual intake air temperature of the engine 1 and send it to the control unit 7. The control unit 7 is also configured to perform parameter adjustment again on the bypass valve 5 when it is determined that the actual intake air temperature of the engine 1 does not satisfy the target intake air temperature.
Further, the control unit 7 is configured to adjust the opening degree of the bypass valve 5 by a first preset threshold value when the actual intake air temperature of the engine 1 is lower than the target intake air temperature, and to adjust the opening degree of the bypass valve 5 by a second preset threshold value when the actual intake air temperature of the engine 1 is higher than the target intake air temperature.
The invention fully utilizes the characteristics of higher temperature of the pressurized air and larger latent heat of gasification of the methanol fuel, and reasonably controls the air inlet system of the engine 1, thereby optimizing the heat management of the whole vehicle, reducing the power consumption of the intercooler 4, reducing the pumping loss of the air inlet system and further improving the combustion economy of the engine 1. And through the reasonable control to the inlet air temperature under the different operating modes of engine 1, can effectively improve methyl alcohol gasification, improve methyl alcohol and air mixing homogeneity to improve the emission nature and the economic nature of engine 1. In addition, the invention has the advantages of small structural change, easy realization and obvious performance improvement effect on the engine 1.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. An air intake control method for a methanol engine, characterized by comprising:
collecting the working state information of the engine;
determining a target intake air temperature of the engine according to the working state information of the engine;
searching a bypass valve opening corresponding to a target inlet air temperature of the engine from a preset storage module, wherein the preset storage module stores a corresponding relation between the target inlet air temperature of the engine and the bypass valve opening in advance;
and adjusting parameters of the bypass valve according to the searched opening degree of the bypass valve so as to change the air inlet temperature of the engine.
2. The methanol engine intake control method according to claim 1, further comprising, after performing parameter adjustment on the bypass valve according to the found opening degree of the bypass valve:
detecting an actual intake air temperature of the engine;
judging whether the actual air inlet temperature of the engine meets the target air inlet temperature or not;
if the parameter is not satisfied, the parameter of the bypass valve is adjusted again.
3. The methanol engine intake control method according to claim 2, wherein if the bypass valve is not satisfied, performing parameter adjustment again on the bypass valve specifically comprises:
when the actual air inlet temperature of the engine is lower than the target air inlet temperature, the opening degree of the bypass valve is adjusted to be larger than a first preset threshold value;
and when the actual air inlet temperature of the engine is higher than the target air inlet temperature, adjusting the opening of the bypass valve to be smaller than a second preset threshold value.
4. The methanol engine intake control method according to claim 1,
the working state information of the engine comprises the methanol injection amount under the current working condition of the engine and the knock parameter of the engine.
5. The methanol engine intake control method according to claim 4,
when the methanol injection amount of the engine under the current working condition is not changed, the lower the knock parameter of the engine is, the higher the target air inlet temperature of the engine is;
when the knock parameter of the engine is not changed, the more the methanol injection amount of the engine under the current working condition is, the higher the target air inlet temperature of the engine is.
6. An air inlet control system of a methanol engine is characterized by comprising a main loop formed by sequentially connecting an engine, a turbocharger, an intercooler and a throttle valve,
the turbocharger air control system further comprises a bypass valve, wherein the bypass valve is provided with an air inlet and an air outlet, the air inlet is connected with an outlet of the turbocharger, and the air outlet is connected with an air inlet of the throttle valve;
the detection unit is used for acquiring the working state information of the engine;
and the control unit is in signal connection with the detection unit and is used for receiving the working state information of the engine sent by the detection unit, determining the target air inlet temperature of the engine according to the working state information of the engine, searching the opening degree of a bypass valve corresponding to the target air inlet temperature of the engine from a preset storage module, wherein the preset storage module stores the corresponding relation between the target air inlet temperature of the engine and the opening degree of the bypass valve in advance, and finally performing parameter adjustment on the bypass valve according to the searched opening degree of the bypass valve to change the air inlet temperature of the engine, wherein the preset storage module and the bypass valve are both in signal connection with the control unit.
7. The methanol engine intake control system of claim 6,
the detection unit is also used for detecting the actual air inlet temperature of the engine and sending the actual air inlet temperature to the control unit;
the control unit is further used for adjusting the parameters of the bypass valve again when the actual air inlet temperature of the engine is judged not to meet the target air inlet temperature.
8. The methanol engine intake control system of claim 7,
the control unit is configured to adjust the opening degree of the bypass valve to be larger by a first preset threshold value when the actual intake air temperature of the engine is lower than the target intake air temperature, and to adjust the opening degree of the bypass valve to be smaller by a second preset threshold value when the actual intake air temperature of the engine is higher than the target intake air temperature.
9. The methanol engine intake control system of claim 7,
the working state information of the engine comprises the methanol injection amount under the current working condition of the engine and the knock parameter of the engine.
10. The methanol engine intake control system of claim 9,
when the methanol injection amount of the engine under the current working condition is not changed, the lower the knock parameter of the engine is, the higher the target air inlet temperature of the engine is;
when the knock parameter of the engine is not changed, the more the methanol injection amount of the engine under the current working condition is, the higher the target air inlet temperature of the engine is.
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| CN202010305734.6A CN111412058A (en) | 2020-04-17 | 2020-04-17 | Methanol engine air intake control method and system |
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| CN112012826A (en) * | 2020-09-03 | 2020-12-01 | 潍柴动力股份有限公司 | Method, device and system for inter-cooling bypass thermal management |
| CN114183236A (en) * | 2021-10-29 | 2022-03-15 | 东风商用车有限公司 | Automatic control system for cold after-temperature of engine in cold region environment and use method thereof |
| CN116387553A (en) * | 2023-06-05 | 2023-07-04 | 南昌大学 | SOFC system temperature control device and method |
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