CN109404176A - A kind of commercial vehicle engine air inlet intermittent-heating control system and method based on state machine - Google Patents

A kind of commercial vehicle engine air inlet intermittent-heating control system and method based on state machine Download PDF

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Publication number
CN109404176A
CN109404176A CN201811379971.6A CN201811379971A CN109404176A CN 109404176 A CN109404176 A CN 109404176A CN 201811379971 A CN201811379971 A CN 201811379971A CN 109404176 A CN109404176 A CN 109404176A
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time
heating
temperature
preheating
control module
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CN109404176B (en
Inventor
周海早
陈首刚
于凯
刘建江
郭斌
张鹏
王明卿
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FAW Jiefang Automotive Co Ltd
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FAW Jiefang Automotive Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/13—Combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

The invention discloses a kind of commercial vehicle engine air inlet intermittent-heating control system and control method based on state machine, belong to commercial vehicle automotive electronics technical field of engine control, including sensor acquisition module, charge heating Logic control module and relay control module；The system does not need acquisition driver's heating instructions, effectively avoids maloperation, carries out fine computer heating control by electric-control system inner strategy completely.It can reduce and be burnt due to preheating excessively caused discharged or defective battery or preheating device because long-time is generated heat well, and preheating it is insufficient caused by the insufficient problem of engine start after-combustion, greatly reduce the discharged or defective battery as caused by extensive heating and the problem that lacks that burning caused by heating is insufficient, exhaust pipe is smoldered after starting.

Description

A kind of commercial vehicle engine air inlet intermittent-heating control system based on state machine and Method
Technical field
The invention belongs to commercial vehicle automotive electronics technical field of engine control, and in particular to a kind of according to engine start State, external environment etc. switch the control system and method that intermittent-heating is carried out to engine charge based on state machine state.
Background technique
Currently, each cart enterprise has an effect to intelligent vehicle and new-energy automobile technique direction one after another, traditional fuel field automobile is exhaled Sound is weaker, but does not represent traditional fuel field control technology and stagnated.Diesel engine high, specific work with its thermal efficiency Rate weight is low, failure maintains less and is easy, is less prone to the features such as heart failure, safety, high reliablity, deep always to be recognized by market Can, especially possess the status that can not be shaken in fields such as commercial vehicle heavy goods vehicles, ship, heavy construction devices.It is sent out in commercial vehicle In many control strategies and method of motivation, the preheating to gas handling system is a more special control method.It is well known that Commercial vehicle diesel oil scheme engine often carries out operation under relatively rugged environment, and plateau, cold district are exactly one type, Under the lower environment of temperature, the demand torque of diesel engine starting increases, and the performance of fuel-oil atmozation is poor, compressed air themperature Lower, fuel oil spontaneous combustion effect is deteriorated, and the above factor results in diesel oil scheme engine starting difficulty under low-temperature condition.Mesh It is preceding more to the ancillary measure started under low-temperature condition on the market, also have using being heated to air inlet and promotes starting performance Scheme, but general control method is not fine enough, easily causes due to excessively preheating and makes accumulator electric-quantity loss, power shortage or pre- Thermal is burnt because long-time is generated heat, or preheats after deficiency causes engine start and smoke event occur.
Summary of the invention
For engine existing in the prior art in the heating process for carrying out air inlet the extensive phenomenon of method, the present invention Be designed to provide a kind of commercial vehicle engine air inlet intermittent-heating control method based on state machine, do not need acquisition drive Member's heating instructions effectively avoid maloperation, carry out fine computer heating control by electric-control system inner strategy completely.It can be well It reduces and is burnt due to preheating excessively caused discharged or defective battery or preheating device because long-time is generated heat, and preheating deficiency is made At the insufficient problem of engine start after-combustion.
The present invention is achieved through the following technical solutions:
A kind of commercial vehicle engine air inlet intermittent-heating control system based on state machine, including sensor acquisition module, Charge heating Logic control module and relay control module；
The sensor acquisition module, for being passed by atmosphere temperature transducer, cooling-water temperature transmitter, intake air temperature Sensor etc. acquires atmospheric temperature, the coolant temperature of engine, intake air temperature, fuel oil temperature, revolving speed, starting state information, warp Interface message conversion is crossed, the input information that control system can be identified and be applied is converted to, is transferred to charge heating logic control In module；
The charge heating Logic control module, for starting state locating for engine to be divided into prestart preheating, is risen Three phases are heated after heating and starting in dynamic；
In prestart warm-up phase, the charge heating Logic control module is to coolant temperature, intake air temperature, fuel oil temperature Degree, atmospheric temperature are averaged and obtain current organism temperature, then using current organism temperature as X-axis, atmospheric pressure is Y-axis, inquiry Heating time table P1 obtains prestart and continues preheating time t1, and the preheating instruction exported within the t1 time is activation, after the t1 time Wait state after into prestart charge heating, the preheating instruction exported at this time is not activate；
Table P1
Pressure (kpa) temperature (DEG C) -40 -30 -25 -22 -20 0 50 120
0 50s 50s 50s 50s 40s 0s 0s 0s
25.6 50s 50s 50s 50s 40s 0s 0s 0s
51.2 50s 50s 50s 50s 40s 0s 0s 0s
64 50s 50s 50s 50s 40s 0s 0s 0s
76.8 50s 50s 50s 50s 40s 0s 0s 0s
89.6 50s 50s 50s 50s 40s 0s 0s 0s
102.4 50s 50s 50s 50s 40s 0s 0s 0s
115.2 50s 50s 50s 50s 40s 0s 0s 0s
The heating period in starting, the charge heating Logic control module is to coolant temperature, intake air temperature, fuel oil temperature Degree, atmospheric temperature are averaged and obtain current organism temperature, then using current organism temperature as X-axis, inquire heating time table P2, obtain Lasting inlet air heating time t2 into starting process, the preheating instruction exported within the t2 time is activation, and t2 enters after the time Wait state after inlet air heating in starting, the preheating instruction exported at this time is not activate；
Table P2
Temperature (DEG C) -40 -30.016 -20 -10.016 0 10.016 50.016 120
Time (s) 0 0 0 0 0 0 0 0
Heating period after activation, the charge heating Logic control module is according to coolant temperature, intake air temperature, fuel oil Temperature, atmospheric temperature calculate to obtain current organism temperature, firstly, calculating the average value of four temperature, inquiry table H1 obtains the time T1, if T1 is greater than runing time after engine start, using average value as current substrate temperature, if T1 is less than engine start Runing time afterwards, then using coolant temperature as current organism temperature；Using current organism temperature as X-axis, atmospheric pressure is Y-axis, Heating time table P3, the time t3 of inlet air heating for the first time after being started are inquired, the preheating instruction exported within the t3 time is sharp Living, wait state, the preheating exported at this time instruct not activate after inlet air heating into after starting successfully after the t3 time；
Table H1
Temperature (DEG C) -40 -35.008 -30.016 -24.992 -20 -15.008 -10.016 -4.992
Time (s) 90 90 90 90 90 75 60 50
Table P3
Pressure (kpa) temperature (DEG C) -40 -30.016 -24.992 -22.016 -20 -4.992 0 40
0 150s 150s 150s 120s 120s 120s 0s 0s
25.6 150s 150s 150s 120s 120s 120s 0s 0s
51.2 150s 150s 150s 120s 120s 120s 0s 0s
64 150s 150s 150s 120s 120s 120s 0s 0s
76.8 150s 150s 150s 120s 120s 120s 0s 0s
89.6 150s 150s 150s 120s 120s 120s 0s 0s
102.4 150s 150s 150s 120s 120s 120s 0s 0s
115.2 150s 150s 150s 120s 120s 120s 0s 0s
After the inlet air heating after starting successfully when wait state, using current coolant temperature as X-axis, atmospheric temperature is Y-axis inquires intermittent-heating timetable P4, obtains intermittent-heating time t4, using current coolant temperature as X-axis, atmospheric temperature Y Axis inquires intermittent-heating frequency table P5, obtains intermittent-heating frequency n, n times intermittent-heating is then carried out, when each intermittent-heating Between be t4, the preheating instruction exported within the t4 time is activation, per intermittent-heating twice between have a fixed waiting time T5 (120s), the preheating instruction exported within the t5 time is not activate.
Table P4
Table P5
Temperature (DEG C) temperature (DEG C) -40 -30.016 -24.992 -22.016 -20 -4.992 0 40
-40 3 times 3 times 3 times 2 times 2 times 1 time 0 time 0 time
-30.016 3 times 3 times 3 times 2 times 2 times 1 time 0 time 0 time
-24.992 3 times 3 times 3 times 2 times 2 times 1 time 0 time 0 time
-22.016 2 times 2 times 2 times 2 times 2 times 1 time 0 time 0 time
-20 2 times 2 times 2 times 2 times 2 times 1 time 0 time 0 time
-4.992 1 time 1 time 1 time 1 time 1 time 1 time 0 time 0 time
0 0 time 0 time 0 time 0 time 0 time 0 time 0 time 0 time
40 0 time 0 time 0 time 0 time 0 time 0 time 0 time 0 time
The relay control module is examined simultaneously for receiving the preheating instruction of charge heating Logic control module output Survey the electrical fault condition of preheating relay；I.e. if receiving the preheating activation instruction that the duration is t, persistently t time Preheating relay is driven to be attracted, to power to high current intake air preheater, high current intake air preheater is started to work, and continues t Time realizes the heating function of air inlet.
Further, cold phenomenon caused by the long-term unstart of engine, the air inlet are pre- after preheating successfully in order to prevent Hot Logic control module further includes the function that reinitializes of pre- heat function, i.e., if waiting shape after prestart charge heating State is more than a period of time (10s), and state machine automatic jumps to init state, then enters back into prestart charge heating state.
Further, occur that phenomenon can not be started due to discharged or defective battery caused by preheating in order to prevent, in prestart, rise Stage during dynamic, the equal current battery voltage situation of real-time monitoring are lower than certain setting value L1 if there is current battery voltage, then Pre- Warm status is exited, the preferential basic function for guaranteeing battery can be realized.
A kind of commercial vehicle engine air inlet intermittent-heating control method based on state machine, the specific steps are as follows:
Step 1: atmospheric temperature, the coolant temperature of engine, intake air temperature, combustion are acquired by sensor acquisition module Oil temperature, revolving speed, starting state information are tabled look-up by the property list provided each sensor supplier, obtain control system The input information that system can be identified and be applied, is then transferred to charge heating Logic control module；
Step 2: in charge heating Logic control module, adoption status machine method is inputted according to sensor acquisition module Information, calculate prestart, in starting, when waiting after starting the heating duration of air inlet, air inlet intermittent-heating duration, heating It is long, and inlet air heating instruction is obtained, it is transferred to relay control module；
Step 3: in relay control module, instructing according to the inlet air heating of charge heating Logic control module input, It drives preheating relay to be attracted or disconnect, to realize to the power supply or power-off of high current intake air preheater, finally realizes different The heating function to air inlet under operating condition.
Compared with prior art, advantages of the present invention is as follows:
A kind of commercial vehicle engine air inlet intermittent-heating control system and control method based on state machine of the invention mentions It has supplied under working conditions of different engines to greatly reduce due to thick the flexible configuration of air inlet, the fine heat protocol of seamless connection It puts discharged or defective battery caused by heating and lacks the insufficient, exhaust pipe of burning caused by heating after starting and smolder problem.
Detailed description of the invention
Fig. 1 is that a kind of structure of commercial vehicle engine air inlet intermittent-heating control system based on state machine of the invention is shown It is intended to；
The charge heating Logic control module flow diagram of the position Fig. 2 control system of the invention；
Fig. 3 is preheating relay schematic diagram.
Specific embodiment
The present invention is described further with reference to the accompanying drawing.
Embodiment 1
Fig. 1 is the flow diagram of the control system, and specific control process is as follows:
After driver, which opens key door switch, to be powered on to vehicle and engine controller, which starts work Make, atmospheric temperature, engine are acquired by atmosphere temperature transducer, cooling-water temperature transmitter, intake air temperature sensor etc. Coolant temperature, intake air temperature, revolving speed, starting state information are converted in sensor acquisition module by interface message, are turned It is changed to the input information that control system can be identified and be applied, is transferred in charge heating Logic control module.
In charge heating Logic control module, charge heating init state is initially entered, it is mainly pre- to entire air inlet Hot Logic control module is initialized, and the prestart charge heating state in the pre- Warm status of prestart is then switched to.
In the pre- Warm status of prestart, charge heating Logic control module is to coolant temperature, intake air temperature, fuel oil temperature Degree, atmospheric temperature this four temperature, which are averaged, obtains current organism temperature, then with current organism temperature for X axis, atmospheric pressure For Y-axis, heating time table P1 is inquired, prestart is obtained and continues preheating time t1, the preheating instruction exported within the t1 time is sharp It is living, wait state after the prestart charge heating in the pre- Warm status of prestart is entered after the t1 time, output state is not at this time The preheating of activation instructs.
Table P1
Pressure (kpa) temperature (DEG C) -40 -30 -25 -22 -20 0 50 120
0 50s 50s 50s 50s 40s 0s 0s 0s
25.6 50s 50s 50s 50s 40s 0s 0s 0s
51.2 50s 50s 50s 50s 40s 0s 0s 0s
64 50s 50s 50s 50s 40s 0s 0s 0s
76.8 50s 50s 50s 50s 40s 0s 0s 0s
89.6 50s 50s 50s 50s 40s 0s 0s 0s
102.4 50s 50s 50s 50s 40s 0s 0s 0s
115.2 50s 50s 50s 50s 40s 0s 0s 0s
After charge heating Logic control module monitors operation of the driver to engine ignition, shape is preheated by prestart State is switched to heated condition in starting, initially enters inlet air heating state in starting, charge heating Logic control module is to cooling Liquid temperature, intake air temperature, fuel oil temperature, atmospheric temperature, which are averaged, obtains current organism temperature, then with current organism temperature is X Axis inquires heating time table P2, obtains the lasting inlet air heating time t2 in starting process, the preheating exported within the t2 time refers to Enabling is activation, and into wait state after inlet air heating in starting after the t2 time, the preheating instruction exported at this time is not activate；
Table P2
Temperature (DEG C) -40 -30.016 -20 -10.016 0 10.016 50.016 120
Time (s) 0 0 0 0 0 0 0 0
After charge heating Logic control module monitors engine start successful state, module is by heating shape in starting State is switched to heated condition after starting, initially enters after starting successfully inlet air heating state for the first time, charge heating logic control mould Root tuber calculates to obtain current organism temperature according to coolant temperature, intake air temperature, fuel oil temperature, atmospheric temperature, i.e., if engine Runing time is shorter after starting, still uses the average value of this four temperature as current organism temperature；And if engine start Runing time is longer afterwards, more than inquiring the obtained time HT1 of warm-up period table H1 using the average value of this four temperature as X-axis, Subsequent calculating is so participated in using coolant temperature as current organism temperature at this time.After obtaining current organism temperature, as X Axis, atmospheric pressure are Y-axis, inquire heating time table P3, the inlet air heating for the first time time t3 after being started, defeated within the t3 time Preheating instruction out is activation, and wait state, the preheating exported at this time after inlet air heating after starting successfully are entered after the t3 time Instruction is not activate.
Table H1
Table P3
Pressure (kpa) temperature (DEG C) -40 -30.016 -24.992 -22.016 -20 -4.992 0 40
0 150s 150s 150s 120s 120s 120s 0s 0s
25.6 150s 150s 150s 120s 120s 120s 0s 0s
51.2 150s 150s 150s 120s 120s 120s 0s 0s
64 150s 150s 150s 120s 120s 120s 0s 0s
76.8 150s 150s 150s 120s 120s 120s 0s 0s
89.6 150s 150s 150s 120s 120s 120s 0s 0s
102.4 150s 150s 150s 120s 120s 120s 0s 0s
115.2 150s 150s 150s 120s 120s 120s 0s 0s
After the inlet air heating after starting successfully when wait state, using current coolant temperature as X-axis, atmospheric temperature is Y-axis inquires intermittent-heating timetable P4, obtains intermittent-heating time t4, using current coolant temperature as X-axis, atmospheric temperature Y Axis inquires intermittent-heating frequency table P5, obtains intermittent-heating frequency n.Then branch to air inlet intermittent-heating shape after starting successfully State carries out n times intermittent-heating, and each intermittent-heating time is t4, and the preheating instruction exported within the t4 time is activation, per twice There is a fixed waiting time t5 between intermittent-heating, the preheating instruction exported within the t5 time is not activate.Intermittent-heating After the completion, the inlet air heating abort state into after starting successfully.It certainly, can be with if calculating intermittent-heating number is 0 time Inlet air heating abort state after starting successfully is directly switched to by wait state after inlet air heating after starting successfully.
Table P4
Temperature (DEG C) temperature (DEG C) -40 -30.016 -24.992 -22.016 -20 -4.992 0 40
-40 57.6s 57.6s 57.6s 38.4s 38.4s 38.4s 0s 0s
-30.016 57.6s 57.6s 57.6s 38.4s 38.4s 38.4s 0s 0s
-24.992 57.6s 57.6s 57.6s 38.4s 38.4s 38.4s 0s 0s
-22.016 38.4s 38.4s 38.4s 38.4s 38.4s 38.4s 0s 0s
-20 38.4s 38.4s 38.4s 38.4s 38.4s 38.4s 0s 0s
-4.992 38.4s 38.4s 38.4s 38.4s 38.4s 38.4s 0s 0s
0 0s 0s 0s 0s 0s 0s 0s 0s
40 0s 0s 0s 0s 0s 0s 0s 0s
Table P5
After receiving the preheating instruction issued by charge heating Logic control module, relay control module is according to receiving The length of instruction time drives the actuation of preheating relay, to power to high current intake air preheater, realizes heating function. Specific implementation are as follows: in the case where relay is in normal connection status, if it is desired to open heated condition, then be exported to relay Pin exports a low level, and the high level of another pin default of cooperation relay is attracted relay, and then control high current Preheater is started to work., whereas if being not intended to open heated condition, then a high level is exported to relay output pin, The high level for cooperating another pin default of relay, disconnects relay, and then stop high current preheater working condition.
I.e. if in prestart warm-up phase, the preheating activation instruction of lasting t1 time is received, then persistently the t1 time drives Dynamic preheating relay is attracted, to power to high current intake air preheater, high current intake air preheater is started to work, when continuing t1 Between, realize that prestart carries out pre- heat function to air inlet.
If the heating period in starting, the preheating activation instruction of lasting t2 time is received, then lasting t2 time driving Preheating relay is attracted, to power to high current intake air preheater, high current intake air preheater is started to work, when continuing t2 Between, realize inlet air heating function in starting.
If the heating period after activation, the preheating activation instruction of lasting t3 time is received, then lasting t3 time driving Preheating relay is attracted, to power to high current intake air preheater, high current intake air preheater is started to work, when continuing t3 Between, realize inlet air heating function for the first time after starting.
If the heating period after activation, the preheating activation instruction of lasting t4 time is received, then lasting t4 time driving Preheating relay is attracted, to power to high current intake air preheater, high current intake air preheater is started to work, when continuing t4 Between, realize air inlet intermittent-heating function after starting.
Further, in control system is in the pre- Warm status of prestart or starts when heated condition, real-time monitoring is worked as Preceding battery voltage situation is lower than certain setting value L1 if there is current battery voltage value, then exit current prestart preheating or Heated condition in starting, into starting after heated condition starting success after wait state, the preferential basic training for guaranteeing battery It can realize.Engine start after-burning is solved after driver starts vehicle success, then through intermittent-heating after starting successfully Burn insufficient problem.
Further, if there is some temperature sensor such as fuel temperature sensor to occur in four temperature sensors Failure does not consider the output valve of the sensor then, only calculates coolant temperature, intake air temperature, atmosphere temperature transducer and collects The average value of temperature obtain current organism temperature for subsequent calculating.
Further, cold phenomenon caused by the long-term unstart of engine, the air inlet are pre- after preheating successfully in order to prevent Hot Logic control module further includes the strategy that reinitializes of pre- heat function, i.e., if waiting shape after prestart charge heating State is more than a period of time, and state machine automatic jumps to init state, then enters back into the pre- Warm status of prestart, calculate current machine Temperature, then using current organism temperature as X-axis, atmospheric pressure is Y-axis inquires heating time table P1, obtain prestart continue it is pre- Hot time t1, the preheating instruction exported within the t1 time are activation, and wait state after prestart charge heating is entered after the t1 time, The preheating instruction exported at this time not activate, and so on, ensure that so neither can continuous heating lead to overheat, battery Phenomena such as power shortage, relay are burnt will not lead to cold because driver is long-term inoperative.
Further, whether work of the actuation or disconnection of the control relay to control high current preheater, tool Body implementation are as follows: in the case where relay is in normal connection status, if it is desired to open heated condition, then give relay efferent duct Foot exports a low level, and the high level of another pin default of cooperation relay is attracted relay, and then it is pre- to control high current Hot device is started to work., whereas if being not intended to open heated condition, then a high level is exported to relay output pin, matched The high level for closing another pin default of relay, disconnects relay, and then stop high current preheater working condition.
The present invention can substantially reduce the discharged or defective battery problem as caused by extensive heating, especially to after starting due to lack Problem that burning caused by few inlet air heating is insufficient, exhaust pipe is smoldered is with extraordinary solution effect.
The above is only a specific embodiment of the invention, and description is more specific and detailed, but can not therefore understand For limitations on the scope of the patent of the present invention.It should be pointed out that for those of ordinary skill in the art, not departing from this Under the premise of inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.Therefore, originally The scope of protection shall be subject to the appended claims for patent of invention.

Claims (2)

1. a kind of commercial vehicle engine air inlet intermittent-heating control system based on state machine, which is characterized in that including sensor Acquisition module, charge heating Logic control module and relay control module；
The sensor acquisition module, for passing through atmosphere temperature transducer, cooling-water temperature transmitter, intake air temperature sensor Deng acquisition atmospheric temperature, the coolant temperature of engine, intake air temperature, fuel oil temperature, revolving speed, starting state information, by connecing Message breath conversion, is transferred in charge heating Logic control module；
The charge heating Logic control module, used in starting state locating for engine to be divided into prestart preheating, start Three phases are heated after heating and starting；
In prestart warm-up phase, the charge heating Logic control module to coolant temperature, intake air temperature, fuel oil temperature, Atmospheric temperature, which is averaged, obtains current organism temperature, then using current organism temperature as X-axis, atmospheric pressure is Y-axis, inquiry heating Timetable P1 obtains prestart and continues preheating time t1, and the preheating instruction exported within the t1 time is activation, and t1 enters after the time Wait state after prestart charge heating, the preheating instruction exported at this time is not activate；
Table P1
Pressure (kpa) temperature (DEG C) -40 -30 -25 -22 -20 0 50 120 0 50s 50s 50s 50s 40s 0s 0s 0s 25.6 50s 50s 50s 50s 40s 0s 0s 0s 51.2 50s 50s 50s 50s 40s 0s 0s 0s 64 50s 50s 50s 50s 40s 0s 0s 0s 76.8 50s 50s 50s 50s 40s 0s 0s 0s 89.6 50s 50s 50s 50s 40s 0s 0s 0s 102.4 50s 50s 50s 50s 40s 0s 0s 0s 115.2 50s 50s 50s 50s 40s 0s 0s 0s
The heating period in starting, the charge heating Logic control module to coolant temperature, intake air temperature, fuel oil temperature, Atmospheric temperature, which is averaged, obtains current organism temperature, then using current organism temperature as X-axis, inquires heating time table P2, obtains Lasting inlet air heating time t2 in starting process, the preheating instruction exported within the t2 time is activation, and t2 enters after the time Wait state after inlet air heating in dynamic, the preheating instruction exported at this time is not activate；
Table P2
Temperature (DEG C) -40 -30.016 -20 -10.016 0 10.016 50.016 120 Time (s) 0 0 0 0 0 0 0 0
Heating period after activation, the charge heating Logic control module is according to coolant temperature, intake air temperature, fuel oil temperature Degree, atmospheric temperature calculate to obtain current organism temperature, firstly, calculating the average value of four temperature, inquiry table H1 obtains time T1, If T1 is greater than runing time after engine start, using average value as current substrate temperature, if after T1 is less than engine start Runing time, then using coolant temperature as current organism temperature；Using current organism temperature as X-axis, atmospheric pressure is Y-axis, is looked into Heating time table P3, the time t3 of inlet air heating for the first time after being started are ask, the preheating instruction exported within the t3 time is activation, Wait state, the preheating exported at this time instruct not activate after inlet air heating into after starting successfully after the t3 time；
Table H1
Temperature (DEG C) -40 -35.008 -30.016 -24.992 -20 -15.008 -10.016 -4.992 Time (s) 90 90 90 90 90 75 60 50
Table P3
Pressure (kpa) temperature (DEG C) -40 -30.016 -24.992 -22.016 -20 -4.992 0 40 0 150s 150s 150s 120s 120s 120s 0s 0s 25.6 150s 150s 150s 120s 120s 120s 0s 0s 51.2 150s 150s 150s 120s 120s 120s 0s 0s 64 150s 150s 150s 120s 120s 120s 0s 0s 76.8 150s 150s 150s 120s 120s 120s 0s 0s 89.6 150s 150s 150s 120s 120s 120s 0s 0s 102.4 150s 150s 150s 120s 120s 120s 0s 0s 115.2 150s 150s 150s 120s 120s 120s 0s 0s
After the inlet air heating after starting successfully when wait state, using current coolant temperature as X-axis, atmospheric temperature is Y-axis, Intermittent-heating timetable P4 is inquired, intermittent-heating time t4 is obtained, using current coolant temperature as X-axis, atmospheric temperature is Y-axis, Intermittent-heating frequency table P5 is inquired, intermittent-heating frequency n is obtained, then carries out n times intermittent-heating, each intermittent-heating time is T4, the preheating instruction exported within the t4 time are activation, have a fixed waiting time t5 per between intermittent-heating twice, The preheating instruction exported in the t5 time is not activate；Wherein, t5=120s；
Table P4
Temperature (DEG C) temperature (DEG C) -40 -30.016 -24.992 -22.016 -20 -4.992 0 40 -40 57.6s 57.6s 57.6s 38.4s 38.4s 38.4s 0s 0s -30.016 57.6s 57.6s 57.6s 38.4s 38.4s 38.4s 0s 0s -24.992 57.6s 57.6s 57.6s 38.4s 38.4s 38.4s 0s 0s -22.016 38.4s 38.4s 38.4s 38.4s 38.4s 38.4s 0s 0s -20 38.4s 38.4s 38.4s 38.4s 38.4s 38.4s 0s 0s -4.992 38.4s 38.4s 38.4s 38.4s 38.4s 38.4s 0s 0s 0 0s 0s 0s 0s 0s 0s 0s 0s 40 0s 0s 0s 0s 0s 0s 0s 0s
Table P5
Temperature (DEG C) temperature (DEG C) -40 -30.016 -24.992 -22.016 -20 -4.992 0 40 -40 3 times 3 times 3 times 2 times 2 times 1 time 0 time 0 time -30.016 3 times 3 times 3 times 2 times 2 times 1 time 0 time 0 time -24.992 3 times 3 times 3 times 2 times 2 times 1 time 0 time 0 time -22.016 2 times 2 times 2 times 2 times 2 times 1 time 0 time 0 time -20 2 times 2 times 2 times 2 times 2 times 1 time 0 time 0 time -4.992 1 time 1 time 1 time 1 time 1 time 1 time 0 time 0 time 0 0 time 0 time 0 time 0 time 0 time 0 time 0 time 0 time 40 0 time 0 time 0 time 0 time 0 time 0 time 0 time 0 time
The relay control module for receiving the preheating instruction of charge heating Logic control module output, while detecting pre- The electrical fault condition of electrothermal relay；I.e. if receiving the preheating activation instruction that the duration is t, persistently t time driving Preheating relay is attracted, to power to high current intake air preheater, high current intake air preheater is started to work, and continues the t time, Realize the heating function of air inlet.
2. a kind of control of the commercial vehicle engine air inlet intermittent-heating control system based on state machine as described in claim 1 Method, which is characterized in that specific step is as follows:
Step 1: atmospheric temperature, the coolant temperature of engine, intake air temperature, fuel oil temperature are acquired by sensor acquisition module Degree, revolving speed, starting state information are tabled look-up by the chart attirbutes provided each sensor supplier, obtain control system The input information that can be identified and apply, is then transferred to charge heating Logic control module；
Step 2: in charge heating Logic control module, adoption status machine method, the letter inputted according to sensor acquisition module Breath, calculate prestart, in starting, after starting to the heating duration of air inlet, air inlet intermittent-heating duration, heating waiting time, And inlet air heating instruction is obtained, it is transferred to relay control module；
Step 3: it in relay control module, is instructed according to the inlet air heating of charge heating Logic control module input, driving Preheating relay is attracted or disconnects, to realize to the power supply or power-off of high current intake air preheater, finally realizes different operating conditions Under the heating function to air inlet.
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