CN102359411A - Air intake and exhaust thermal control device and method for implementing HCCI (homogeneous charge compression ignition) combustion of gasoline engine - Google Patents

Air intake and exhaust thermal control device and method for implementing HCCI (homogeneous charge compression ignition) combustion of gasoline engine Download PDF

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CN102359411A
CN102359411A CN2011102438604A CN201110243860A CN102359411A CN 102359411 A CN102359411 A CN 102359411A CN 2011102438604 A CN2011102438604 A CN 2011102438604A CN 201110243860 A CN201110243860 A CN 201110243860A CN 102359411 A CN102359411 A CN 102359411A
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air inlet
exhaust
intake
heat
heat exchanger
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CN102359411B (en
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谢辉
李乐
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Tianjin University
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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
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    • Y02T10/12—Improving ICE efficiencies

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Abstract

The invention discloses an air intake and exhaust thermal control system for implementing HCCI (homogeneous charge compression ignition) combustion of a gasoline engine. The system comprises an air intake pipeline, an air exhaust pipeline and an air exhaust-intake heat exchanger, wherein the heat exchanger is filled with heat storage materials; the air intake pipeline, the air exhaust pipeline and a bypass are respectively provided with an electrically operated valve; the pipelines are provided with a plurality of temperature sensors; the electrically operated valves and the temperature sensors are connected with a controller; and the controller comprises a signal conditioning circuit and a driving circuit which are connected with a singlechip and are used for implementing the thermal control of air intake and air exhaust. The device provided by the invention has the heat storage capability of the heat exchanger, reasonable storage and release of air exhaust heat can be realized. When the gasoline engine operates at medium and large load, the storage and accumulation of surplus air exhaust heat in the heat exchanger can be realized, and the device is used for heating the intake air when the gasoline engine operates at low load, the problem that the air exhaust heat is insufficient to heat the intake air at low load is solved, the requirement of air exhaust-intake heat exchange efficiency is lowered, and the device can be practically applied to the HCCI combustion of the gasoline engine.

Description

Realize the intake and exhaust heat control device and the method for petrol engine HCCI burning
Technical field
The present invention relates to a kind of petrol engine intake and exhaust thermal control system, relate in particular to a kind of intake and exhaust thermal control system of realizing petrol engine HCCI burning.
Background technique
(Homogeneous Charge Compression Ignition HCCI) has higher fuel economy and lower NO to adopt homogeneous compression burning on the petrol engine XThe discharging potentiality.In order to realize the homogeneous compression burning of petrol engine, need be near compression top center the fuel-air mixture in the cylinder be compressed to the high temperature of 1000K.Body is not being done bigger change, keeping under the uniform-charge Otto-engine compression ratio condition, it is a kind of main path that realizes petrol engine HCCI burning that engine charge is heated.Because engine exhaust has higher heat, thus utilize heat exchanger to realize the heat exchange of exhaust-air inlet, thus realize lifting to Engine Inlet Temperature, cannot not become additionally energy consumption and realize a kind of more excellent scheme that petrol engine HCCI burns.
U.S. Lawrence Livermore National Laboratory is adopting under the prerequisite of air intake pressurized to the temperature service hoisting in document SAE2000-01-2869, utilizes exhaust-air inlet heat exchanger to satisfy the needs of HCCI burning to intake temperature.This system rely on the one hand that air intake pressurized brings temperature increase, this cover pilot system can't be accomplished the quick adjustment of intake temperature on the other hand, promptly can't realize the running of HCCI engine burning transient state variable working condition.U.S. Ford Motor Company adopts exhaust-air inlet heat exchange to promote intake temperature in document SAE2002-01-2832, SAE2006-01-1082 and patent US6675579-B1, US2006150952-A1; And the modification engine aspirating system makes it to possess hot and cold two admission lines; Through hot and cold two bursts of air inlets are mixed before getting into cylinder in proportion; To obtain required intake temperature, finally realize the HCCI burning.But because the exchange capability of heat of exhaust-air inlet has received the lower restriction of gas-to-gas heat exchanger efficient, in the actual tests process, can run into the problem that the heat exchange heat is difficult to satisfy air inlet temperature rise demand, must adopt Electric heating appliance to come the service hoisting intake temperature.In addition, the hcci engine of the above-mentioned Ford that mentions has adopted unconventional, higher compression ratio, also is in order to solve heat exchange shortage of heat heating air inlet to temperature required contradiction to a certain extent.Sweden Lund university is in SAE document 2004-01-0943; Aspect the research of petrol engine HCCI burning; Built and U.S. Ford Motor Company similar exhaust-air inlet heat management system; Also being that expectation utilizes the heat exchange of exhaust-air inlet to realize the heating to engine charge, but having run into the not enough problem of heat exchanger exchange capability of heat equally, also is to have adopted Electric heating appliance to promote intake temperature in the test of reality.
Can find out with the research situation that realizes petrol engine HCCI burning from present employing exhaust-air inlet heat exchange; Under the petrol engine compression ratio of routine; Petrol engine HCCI burning is to the high requirements of intake temperature, and the heat exchange efficiency of exhaust-air inlet heat exchanger has been proposed higher requirement.Be illustrated in figure 1 as engine operation when the HCCI pattern, attainable intake temperature and the schematic representation of realizing the intake temperature that the HCCI burning is required after petrol engine delivery temperature, the heat exchange.As can be seen from Figure 1; When the medium and small load of petrol engine; Particularly when little load; The delivery temperature of motor is lower, and realizes that the required intake temperature of HCCI combustion mode is high all the better, and conventional heat exchanger is difficult to make that the intake temperature after the heat exchange satisfies the requirement of HCCI burning to intake temperature; And in petrol engine during high load, the delivery temperature of motor is higher, realizes that the temperature requirements of HCCI burning is lower, so also have more surplus after exhaust gas heat and the air inlet heat exchange.From above-mentioned analysis, can find out,, then must make intake temperature all satisfy the intake temperature demand of HCCI burning in various operating modes if will make petrol engine under full operating mode, realize the HCCI burning.And when the lower little load condition of delivery temperature, even under the service hoisting effect of cooling water-air inlet heat exchange to intake temperature, also must make exhaust-air inlet heat exchanger reach high exchange capability of heat and could satisfy petrol engine and realize the HCCI burning.And gas-to-gas heat exchanger itself just exists the lower shortcoming of heat exchange efficiency; The heat exchanger structure Parameter Optimization is difficult to significantly promote its heat exchange efficiency; Also can bring negative effects such as gas-flow resistance rising, size increase simultaneously, such contradiction has just caused exhaust-air inlet heat exchanger to be difficult to be applied to petrol engine HCCI burning.
Summary of the invention
To above-mentioned existing technology; The present invention provides a kind of intake and exhaust heat control device and method that realizes petrol engine HCCI burning; Through control to the engine breathing heat; Make the heat exchange of exhaust-air inlet be content with very little under each operating mode petrol engine HCCI burning to the demand of intake temperature, exhaust gas heat is not enough to heating air inlet to temperature required problem when particularly solving the little load of petrol engine, thereby realizes the practical application that exhaust-air inlet heat exchange is burnt at petrol engine HCCI.
In order to solve the problems of the technologies described above; The present invention realizes that the technological scheme of the intake and exhaust heat control device of petrol engine HCCI burning is: comprise gas exhaust piping, air inlet pipeline and exhaust-air inlet heat exchanger; Said gas exhaust piping is provided with a discharge bypass through said exhaust-air inlet heat exchanger, and said air inlet pipeline is provided with an air inlet bypass through said exhaust-air inlet heat exchanger; Be filled with heat storage material in said exhaust-air inlet heat exchanger; Be provided with a mortor operated valve respectively in said gas exhaust piping, said discharge bypass, said air inlet pipeline and the said air inlet bypass; On the said gas exhaust piping and the upstream end that is positioned at said discharge bypass be provided with exhaust gas temperature sensor; On the said air inlet pipeline and the downstream part that is positioned at said air inlet bypass be provided with intake air temperature sensor, be provided with the heat exchanger internal temperature sensor in said exhaust-air inlet heat exchanger; Above-mentioned each mortor operated valve all is connected with a controller with exhaust gas temperature sensor, intake air temperature sensor and heat exchanger internal temperature sensor; Said controller comprises signal conditioning circuit and the drive circuit that is connected with a single-chip microcomputer; Wherein, Said signal conditioning circuit links to each other with said exhaust gas temperature sensor, intake air temperature sensor and heat exchanger internal temperature sensor, and said signal conditioning circuit is used for temperature sensor signal is handled; Said drive circuit links to each other with above-mentioned each mortor operated valve, and said drive circuit is used to realize the driving to each mortor operated valve; Said single-chip microcomputer is used for data computation and logic is judged, promptly said single-chip microcomputer is adjusted the switching and the aperture state of above-mentioned each mortor operated valve according to the processing result of obtaining from said signal conditioning circuit, thereby realizes the heat control of intake and exhaust.
The present invention realizes that the intake and exhaust heat control method of petrol engine HCCI burning may further comprise the steps:
Step 1, each temperature transducer and each mortor operated valve are carried out functional detection;
Step 2, set the pairing intake temperature of present engine operating mode according to the arteries and veins stave;
Step 3, signal conditioning circuit obtain the temperature of gas exhaust piping upstream position through exhaust gas temperature sensor; Single-chip microcomputer judges whether this temperature is higher than the temperature of heat storage material in exhaust-air inlet heat exchanger; " if being ", then single-chip microcomputer sends the instruction that the mortor operated valve of opening on the said discharge bypass also cuts out mortor operated valve on the said gas exhaust piping simultaneously to drive circuit; Otherwise, otherwise;
Step 4, signal conditioning circuit are obtained the true temperature of air inlet pipeline downstream position through intake air temperature sensor, judge whether this true temperature satisfies the setting value of intake temperature, if " being " then returned step 2; Otherwise; Then calculate the difference of true temperature and setting value; And then utilize pid algorithm to obtain driving the required dutycycle of mortor operated valve of air inlet pipeline and air inlet bypass; Move according to the mortor operated valve that above-mentioned dutycycle drives air inlet pipeline and air inlet bypass by drive circuit again, make the setting value of true temperature trend intake temperature;
Step 5, judge whether system carries out next heat control circulation, if " being " returned above-mentioned steps two, otherwise, finish heat control.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention compared with prior art; On the basis that can realize the utilization of exhaust gas heat and intake temperature quick adjustment, adopted the heat exchanger that includes heat storage material, make heat exchanger possess the storage capacity of heat; And utilize gas exhaust piping and bypass mortor operated valve to regulate the exhaust heat exchanger of whether flowing through; Realized in the heat exchanger that exhaust gas heat is retained and accumulation, particularly in petrol engine, during high load working condition, can realize the significantly accumulation of exhaust gas heat in heat exchanger; Regulate the flow of inlet stream through air inlet pipeline and bypass mortor operated valve more simultaneously through heat exchanger; Realized that the selectivity of heat in the heat exchanging device utilizes in right amount; Especially when the little load of petrol engine, can accumulate heat in heat exchanger when loading greatly and fully discharge and utilize.
Can find out that the present invention has been owing to possessed the heat storage capacity of heat exchanger, can realize exhaust gas heat is reasonably stored or discharged.Like this when petrol engine is operated in big load; Can unnecessary exhaust gas heat be stored in the heat exchanger; And when little load, be used for air inlet heating; Exhaust gas heat is not enough to the problem of heating air inlet when solving little the load, has reduced the demand to exhaust-air inlet heat exchange efficiency, makes exhaust-air inlet heat exchange scheme can be applied to petrol engine HCCI burning.
Description of drawings
Fig. 1 be in the existing technology petrol engine after conventional delivery temperature, conventional heat exchange under the HCCI combustion mode intake temperature and realize the schematic representation of the intake temperature that the HCCI burning is required;
Fig. 2 is the intake and exhaust heat control device structural representation sketch that the present invention realizes petrol engine HCCI burning;
Fig. 3 is the intake and exhaust heat control method FB(flow block) that the present invention realizes petrol engine HCCI burning.
Among the figure:
1---heat storage material 2---exhaust-air inlet heat exchanger
3,4,11,12---mortor operated valve 5---exhaust gas temperature sensor
6---motor 7---intake air temperature sensor
8---air inlet electric heater 9---heat exchanger internal temperature sensor
10---controller
Embodiment
Below in conjunction with embodiment the present invention is done to describe in further detail.
Basic thought of the present invention is to adopt the exhaust-air inlet heat exchanger that includes heat storage material; And on exhaust and air inlet pipeline, be provided with mortor operated valve; Switching through the gas exhaust piping mortor operated valve realizes accumulation and the storage of heat in heat exchanger in the exhaust, can regulate an amount of use that realizes heat in the air inlet heat exchanging device through the aperture of air inlet pipeline and bypass mortor operated valve simultaneously.
As shown in Figure 2; The present invention realizes the intake and exhaust heat control device of petrol engine HCCI burning; Comprise gas exhaust piping, air inlet pipeline and exhaust-air inlet heat exchanger 2; Said gas exhaust piping is provided with a discharge bypass through said exhaust-air inlet heat exchanger, and said air inlet pipeline is provided with an air inlet bypass through said exhaust-air inlet heat exchanger; Be filled with heat storage material 1 in said exhaust-air inlet heat exchanger 2; Said heat storage material 1 can adopt resistant to elevated temperatures sensible heat heat storage material; Because phase-change heat-storage material can be realized higher storage density; Less for the volume that makes exhaust-air inlet heat exchanger 2, said heat storage material 1 preferably adopts the solid-liquid phase change heat storage material of phase transition temperature at 400 to 700 degree, for example: can adopt phase-change heat-storage materials such as Al-Si alloy.Be provided with a mortor operated valve respectively in said gas exhaust piping, said discharge bypass, said air inlet pipeline and the said air inlet bypass; On the said gas exhaust piping and the upstream end that is positioned at said discharge bypass be provided with exhaust gas temperature sensor 5; On the said air inlet pipeline and the downstream part that is positioned at said air inlet bypass be provided with intake air temperature sensor 7, be provided with heat exchanger internal temperature sensor 9 in said exhaust-air inlet heat exchanger 2; Above-mentioned each mortor operated valve 3,4,11,12 all is connected with a controller 10 with exhaust gas temperature sensor 5, intake air temperature sensor 7 and heat exchanger internal temperature sensor 9; Said controller 10 comprises signal conditioning circuit and the drive circuit that is connected with a single-chip microcomputer; Said single-chip microcomputer can adopt the TC1766/TC1793 of company of Infineon; Formation and the annexation between the three for type selecting, signal conditioning circuit and the drive circuit of the single-chip microcomputer in the controller all belong to the known general knowledge of those skilled in that art, repeat no more at this.Wherein, said signal conditioning circuit links to each other with said exhaust gas temperature sensor 5, intake air temperature sensor 7 and heat exchanger internal temperature sensor 9, and said signal conditioning circuit is used for temperature sensor signal is handled; Said drive circuit links to each other with above-mentioned each mortor operated valve, and said drive circuit is used to realize the driving to each mortor operated valve; Said single-chip microcomputer is used for data computation and logic is judged, promptly said single-chip microcomputer is adjusted the switching and the aperture state of above-mentioned each mortor operated valve according to the processing result of obtaining from said signal conditioning circuit, thereby realizes the heat control of intake and exhaust.
In addition; To the extreme case that might occur; Be that the engine long time service makes that in little load condition exhaust gas heat is not enough in the heat exchanger, can be in said air inlet bypass and the downstream part that is positioned at said exhaust-air inlet heat exchanger 2 be provided with an air inlet electric heater 8.Its main purpose is when the shortage of heat that the heat storage and exchange device provides occurring; Satisfy the demand of HCCI burning under the current working for the intake temperature that makes motor; Open air inlet electric heater 8 this moment; Heating is again carried out in air inlet after the heat exchanging, makes it satisfy the intake temperature requirement of HCCI burning.
As shown in Figure 3, utilize the controlling method of the intake and exhaust heat control device of above-mentioned realization petrol engine HCCI burning may further comprise the steps, be that example comes the intake and exhaust heat control is specified with a single cylinder petrol engine here:
Step 1, each temperature transducer and each mortor operated valve are carried out functional detection;
Step 2, set the pairing intake temperature of present engine operating mode, work in the load that IMEP is 4bar like present engine according to the arteries and veins stave, the knowledge of tabling look-up, the required intake temperature of present engine operating mode is 230 ℃;
Step 3, signal conditioning circuit obtain the temperature of gas exhaust piping upstream position through exhaust gas temperature sensor 5; Can know that delivery temperature is 400 ℃; And the temperature that this moment, heat exchanger heat accumulation internal temperature sensor 9 was obtained is 350 ℃; Single-chip microcomputer judges and knows that this moment, delivery temperature was higher than the temperature of heat storage material 1 in exhaust-air inlet heat exchanger 2, and then single-chip microcomputer sends the instruction that the mortor operated valve of opening on the said discharge bypass also cuts out mortor operated valve on the said gas exhaust piping simultaneously to drive circuit; Make the engine exhaust exhaust-air inlet heat exchanger of flowing through, thereby carry out accumulation and the storage of exhaust gas heat in heat exchanger;
The true temperature that step 4, signal conditioning circuit obtain the air inlet pipeline downstream position through intake air temperature sensor 7 is 220 ℃; Single-chip microcomputer is judged and to be learnt that this true temperature does not satisfy 230 ℃ of the setting values of intake temperature; And the difference of calculating true temperature and setting value is-10 ℃; And then utilize pid algorithm to obtain driving the required dutycycle of mortor operated valve of air inlet pipeline and air inlet bypass; Drive the mortor operated valve of air inlet pipeline and the mortor operated valve action of air inlet bypass according to above-mentioned dutycycle by drive circuit again, make that air inlet bypass mortor operated valve aperture suitably increases, air inlet pipeline mortor operated valve aperture suitably reduces, thereby make true temperature tend to the setting value of intake temperature;
Step 5, judge whether system carries out next heat control circulation, if " being " returned above-mentioned steps two, proceeds heat control, otherwise, heat control finished.
Although invention has been described for top combination figure; But the present invention is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Under the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.

Claims (5)

1. an intake and exhaust heat control device of realizing petrol engine HCCI burning comprises gas exhaust piping, air inlet pipeline and exhaust-air inlet heat exchanger (2), it is characterized in that:
Said gas exhaust piping is provided with a discharge bypass through said exhaust-air inlet heat exchanger, and said air inlet pipeline is provided with an air inlet bypass through said exhaust-air inlet heat exchanger;
Be filled with heat storage material (1) in said exhaust-air inlet heat exchanger (2);
Be provided with a mortor operated valve respectively in said gas exhaust piping, said discharge bypass, said air inlet pipeline and the said air inlet bypass;
On the said gas exhaust piping and the upstream end that is positioned at said discharge bypass be provided with exhaust gas temperature sensor (5); On the said air inlet pipeline and the downstream part that is positioned at said air inlet bypass be provided with intake air temperature sensor (7), be provided with heat exchanger internal temperature sensor (9) in said exhaust-air inlet heat exchanger (2);
Above-mentioned each mortor operated valve (3,4,11,12) all is connected with a controller (10) with exhaust gas temperature sensor (5), intake air temperature sensor (7) and heat exchanger internal temperature sensor (9);
Said controller (10) comprises signal conditioning circuit and the drive circuit that is connected with a single-chip microcomputer; Wherein, Said signal conditioning circuit links to each other with said exhaust gas temperature sensor (5), intake air temperature sensor (7) and heat exchanger internal temperature sensor (9), and said signal conditioning circuit is used for temperature sensor signal is carried out Shelving; Said drive circuit links to each other with above-mentioned each mortor operated valve, and said drive circuit is used to realize the driving to each mortor operated valve; Said single-chip microcomputer is used for data computation and logic is judged, promptly said single-chip microcomputer is adjusted the switching and the aperture state of above-mentioned each mortor operated valve according to the processing result of obtaining from said signal conditioning circuit, thereby realizes the heat control of intake and exhaust.
2. the intake and exhaust heat control device of realization petrol engine HCCI according to claim 1 burning is characterized in that: in the said air inlet bypass and the downstream part that is positioned at said exhaust-air inlet heat exchanger (2) be provided with an air inlet electric heater (8).
3. the intake and exhaust heat control device of realization petrol engine HCCI burning according to claim 1, it is characterized in that: said heat storage material is resistant to elevated temperatures sensible heat heat storage material.
4. the intake and exhaust heat control device of realization petrol engine HCCI burning according to claim 1 is characterized in that: said heat storage material is the solid-liquid phase change heat storage material of phase transition temperature at 400 to 700 degree.
5. an intake and exhaust heat control method of realizing petrol engine HCCI burning utilizes heat control device as claimed in claim 1 to realize the intake and exhaust heat control of petrol engine HCCI burning, may further comprise the steps:
Step 1, each temperature transducer and each mortor operated valve are carried out functional detection;
Step 2, set the pairing intake temperature of present engine operating mode according to the arteries and veins stave;
Step 3, signal conditioning circuit obtain the temperature of gas exhaust piping upstream position through exhaust gas temperature sensor (5); Single-chip microcomputer judges whether this temperature is higher than the temperature of exhaust-interior heat storage material of air inlet heat exchanger (2) (1); " if being ", then single-chip microcomputer sends the instruction that the mortor operated valve of opening on the said discharge bypass also cuts out mortor operated valve on the said gas exhaust piping simultaneously to drive circuit; Otherwise, otherwise;
Step 4, signal conditioning circuit are obtained the true temperature of air inlet pipeline downstream position through intake air temperature sensor (7), judge whether this true temperature satisfies the setting value of intake temperature, if " being " then returned step 2; Otherwise; Then calculate the difference of true temperature and setting value; And then utilize pid algorithm to obtain driving the required dutycycle of mortor operated valve of air inlet pipeline and air inlet bypass; Move according to the mortor operated valve that above-mentioned dutycycle drives air inlet pipeline and air inlet bypass by drive circuit again, make the setting value of true temperature trend intake temperature;
Step 5, judge whether system carries out next heat control circulation, if " being " returned above-mentioned steps two, otherwise, finish heat control.
CN2011102438604A 2011-08-25 2011-08-25 Air intake and exhaust thermal control device and method for implementing HCCI (homogeneous charge compression ignition) combustion of gasoline engine Active CN102359411B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103225550A (en) * 2013-04-16 2013-07-31 上海交通大学 Combustion control method of novel gasoline homogenous charge compression ignition engine and implementation device of method
CN104314717A (en) * 2014-09-29 2015-01-28 日立汽车系统(苏州）有限公司 Air filter and air filter heating control method
CN104656443A (en) * 2014-12-31 2015-05-27 重庆邮电大学 HCCI engine ignition timing self-adaptive PID control method based on BP neural network
CN105508006A (en) * 2015-12-24 2016-04-20 芜湖恒耀汽车零部件有限公司 Vehicle exhaust system pipe device
FR3032009A1 (en) * 2015-01-27 2016-07-29 Valeo Systemes Thermiques AIR INTAKE SYSTEM AND METHOD FOR THERMAL MANAGEMENT OF INTAKE AIR.
CN112901379A (en) * 2021-04-13 2021-06-04 河南柴油机重工有限责任公司 Engine exhaust heating air inlet device and heating method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103225550A (en) * 2013-04-16 2013-07-31 上海交通大学 Combustion control method of novel gasoline homogenous charge compression ignition engine and implementation device of method
CN104314717A (en) * 2014-09-29 2015-01-28 日立汽车系统(苏州）有限公司 Air filter and air filter heating control method
CN104656443A (en) * 2014-12-31 2015-05-27 重庆邮电大学 HCCI engine ignition timing self-adaptive PID control method based on BP neural network
CN104656443B (en) * 2014-12-31 2017-05-24 重庆邮电大学 HCCI engine ignition timing self-adaptive PID control method based on BP neural network
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CN105508006A (en) * 2015-12-24 2016-04-20 芜湖恒耀汽车零部件有限公司 Vehicle exhaust system pipe device
CN112901379A (en) * 2021-04-13 2021-06-04 河南柴油机重工有限责任公司 Engine exhaust heating air inlet device and heating method

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