CN109404176B - State machine-based commercial vehicle engine air inlet intermittent heating control system and method - Google Patents
State machine-based commercial vehicle engine air inlet intermittent heating control system and method Download PDFInfo
- Publication number
- CN109404176B CN109404176B CN201811379971.6A CN201811379971A CN109404176B CN 109404176 B CN109404176 B CN 109404176B CN 201811379971 A CN201811379971 A CN 201811379971A CN 109404176 B CN109404176 B CN 109404176B
- Authority
- CN
- China
- Prior art keywords
- time
- temperature
- preheating
- heating
- air inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- 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 state machine-based commercial vehicle engine air inlet intermittent heating control system and a control method, belonging to the technical field of commercial vehicle electronic engine control, and comprising a sensor acquisition module, an air inlet preheating logic control module and a relay control module; the system does not need to collect a heating instruction of a driver, effectively avoids misoperation, and completely carries out fine heating control through an internal strategy of the electric control system. The problem that the storage battery power shortage or the preheating device burnt out due to long-time heating caused by excessive preheating can be well solved, the problem that the engine cannot burn sufficiently after being started due to insufficient preheating is solved, and the problems that the storage battery power shortage caused by rough heating and the burning caused by lack of heating cannot be sufficiently and the exhaust pipe smokes are greatly reduced.
Description
Technical Field
The invention belongs to the technical field of control over electronic engines of commercial vehicles and automobiles, and particularly relates to a control system and a control method for intermittently heating air intake of an engine based on state machine state switching according to the starting state of the engine, the external environment and the like.
Background
At present, all large vehicle enterprises generate forces in the technical direction of intelligent vehicles and new energy vehicles, and the vehicle call in the traditional fuel field is weak, but the traditional fuel field does not represent that the control technology is not stopped before. The diesel engine has the characteristics of high thermal efficiency, low unit power weight, few faults, easy maintenance, difficult occurrence of power failure, high safety, high reliability and the like, is deeply accepted by the market, and has an unfortunate position particularly in the fields of heavy vehicles, ships, large engineering devices and the like of commercial vehicles. Among the many control strategies and methods for commercial vehicle engines, preheating the intake system is a relatively special control method. As is known, commercial vehicle diesel scheme engines usually work in a severe environment, plateau and cold areas are one of the engines, the required torque for starting the diesel engine is increased in a low-temperature environment, the fuel atomization performance is poor, the compressed air temperature is low, and the fuel spontaneous combustion effect is poor, and the diesel scheme engines are difficult to start in a low-temperature state due to the factors. At present, the auxiliary measures for starting at a low temperature state are more in the market, and a scheme for improving the starting performance by heating the inlet air is adopted, but a general control method is not fine enough, so that the electric quantity loss of a storage battery, the power shortage or the burning of a preheating device due to long-time heating caused by excessive preheating or the phenomenon of smoking after the engine is started caused by insufficient preheating is easily caused.
Disclosure of Invention
Aiming at the phenomenon that the method is extensive in the process of heating the inlet air of the engine in the prior art, the invention aims to provide the state machine-based method for controlling the intermittent heating of the inlet air of the engine of the commercial vehicle, which does not need to collect the heating instruction of a driver, effectively avoids misoperation and completely carries out fine heating control through the internal strategy of an electric control system. The problems of insufficient power of the storage battery caused by excessive preheating or burnout of the preheating device due to long-time heating and insufficient combustion after starting of the engine caused by insufficient preheating can be well solved.
The invention is realized by the following technical scheme:
a commercial vehicle engine air inlet intermittent heating control system based on a state machine comprises a sensor acquisition module, an air inlet preheating logic control module and a relay control module;
the sensor acquisition module is used for acquiring the atmospheric temperature, the coolant temperature of the engine, the air inlet temperature, the fuel temperature, the rotating speed and the starting state information through an atmospheric temperature sensor, a coolant temperature sensor, an air inlet temperature sensor and the like, converting the information into input information which can be identified and applied by a control system through interface information conversion, and transmitting the input information to the air inlet preheating logic control module;
the intake preheating logic control module is used for dividing the starting state of the engine into three stages of preheating before starting, heating during starting and heating after starting;
in the preheating stage before starting, the intake preheating logic control module averages the temperature of cooling liquid, the temperature of intake air, the temperature of fuel oil and the atmospheric temperature to obtain the current temperature of a machine body, then, with the current temperature of the machine body as an X axis and the atmospheric pressure as a Y axis, a heating time table P1 is inquired to obtain the continuous preheating time t1 before starting, the preheating command output within the time t1 is activated, the machine enters a preheating and after-starting waiting state after the time t1, and the preheating command output at the moment is not activated;
TABLE P1
| Pressure (kpa) \ temperature (. degree. 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 |
In the heating stage during starting, the intake preheating logic control module averages the temperature of cooling liquid, the temperature of intake air, the temperature of fuel oil and the atmospheric temperature to obtain the current temperature of the engine body, then, with the current temperature of the engine body as an X axis, a heating time table P2 is inquired to obtain the continuous intake heating time t2 in the starting process, the preheating command output within the time t2 is activated, the engine enters a standby state after intake heating in the starting process after the time t2, and the output preheating command is not activated at the moment;
TABLE P2
| Temperature (. degree.C.) | -40 | -30.016 | -20 | -10.016 | 0 | 10.016 | 50.016 | 120 |
| Time(s) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
In the heating stage after starting, the intake preheating logic control module calculates the current engine body temperature according to the coolant temperature, the intake temperature, the fuel temperature and the atmospheric temperature, firstly, the average value of the four temperatures is calculated, a look-up table H1 obtains time T1, if T1 is greater than the operation time of the engine after starting, the average value is used as the current matrix temperature, and if T1 is less than the operation time of the engine after starting, the coolant temperature is used as the current engine body temperature; inquiring a heating time table P3 by taking the current body temperature as an X axis and the atmospheric pressure as a Y axis to obtain the first air inlet heating time t3 after starting, wherein the preheating command output within the time t3 is activated, the air inlet heating waiting state after the starting is successful is entered after the time t3, and the output preheating command is not activated at the moment;
TABLE H1
| Temperature (. degree.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 (. degree. 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 |
When the air inlet is in a waiting state after the air inlet is heated after the starting is successful, inquiring an intermittent heating time table P4 by taking the current cooling liquid temperature as an X axis and the atmospheric temperature as a Y axis to obtain intermittent heating time t4, inquiring an intermittent heating number table P5 by taking the current cooling liquid temperature as an X axis and the atmospheric temperature as a Y axis to obtain intermittent heating times n, then carrying out intermittent heating for n times, wherein the intermittent heating time is t4 each time, a preheating command output in t4 time is activated, a fixed waiting time t5(120s) exists between every two times of intermittent heating, and the preheating command output in t5 time is inactivated.
TABLE P4
TABLE P5
| Temperature (. degree. C.) \ temperature (. degree. C.) | -40 | -30.016 | -24.992 | -22.016 | -20 | -4.992 | 0 | 40 |
| -40 | 3 times of | 3 times of | 3 times of | 2 times (one time) | 2 times (one time) | 1 time of | 0 time | 0 time |
| -30.016 | 3 times of | 3 times of | 3 times of | 2 times (one time) | 2 times (one time) | 1 time of | 0 time | 0 time |
| -24.992 | 3 times of | 3 times of | 3 times of | 2 times (one time) | 2 times (one time) | 1 time of | 0 time | 0 time |
| -22.016 | 2 times (one time) | 2 times (one time) | 2 times (one time) | 2 times (one time) | 2 times (one time) | 1 time of | 0 time | 0 time |
| -20 | 2 times (one time) | 2 times (one time) | 2 times (one time) | 2 times (one time) | 2 times (one time) | 1 time of | 0 time | 0 time |
| -4.992 | 1 time of | 1 time of | 1 time of | 1 time of | 1 time of | 1 time of | 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 used for receiving a preheating instruction output by the air inlet preheating logic control module and detecting the electrical fault state of the preheating relay; if a preheating activation instruction with the duration time t is received, the preheating relay is driven to be attracted for the duration time t, so that the large-current air inlet preheater is powered, the large-current air inlet preheater starts to work, and the air inlet heating function is realized after the duration time t.
Further, in order to prevent the cold phenomenon caused by long-term un-starting of the engine after the successful preheating, the intake preheating logic control module also comprises a reinitialization function of the preheating function, namely if the state machine is in the intake preheating before starting and then in the waiting state for more than a period of time (10s), the state machine automatically jumps to the initialization state and then enters the intake preheating before starting.
Further, in order to prevent the phenomenon that the storage battery cannot be started due to insufficient power caused by preheating, the current storage battery voltage condition is monitored in real time before starting and in the starting process, if the current storage battery voltage is lower than a certain set value L1, the storage battery exits from the preheating state, and the basic function of the storage battery is preferentially ensured to be realized.
A commercial vehicle engine air inlet intermittent heating control method based on a state machine comprises the following specific steps:
the method comprises the following steps: the method comprises the steps that a sensor acquisition module is used for acquiring atmospheric temperature, coolant temperature of an engine, intake air temperature, fuel oil temperature, rotating speed and starting state information, a characteristic table provided by each sensor supplier is looked up to obtain input information which can be identified and applied by a control system, and then the input information is transmitted to an intake preheating logic control module;
step two: in the intake preheating logic control module, a state machine method is adopted, according to the information input by the sensor acquisition module, the heating time length, the intake intermittent heating time length and the heating waiting time length of the intake before, during and after starting are calculated, and an intake heating instruction is obtained and transmitted to the relay control module;
step three: in the relay control module, the preheating relay is driven to be closed or disconnected according to an air inlet heating instruction input by the air inlet preheating logic control module, so that power supply or power failure of the high-current air inlet preheater is realized, and finally, the heating function of air inlet under different working conditions is realized.
Compared with the prior art, the invention has the following advantages:
the state machine-based commercial vehicle engine air inlet intermittent heating control system and the control method provide a flexible configuration and seamless connection fine heating scheme for air inlet under different engine working conditions, and the problems of insufficient combustion and exhaust pipe smoking caused by insufficient storage battery power and heating shortage after starting due to extensive heating are greatly reduced.
Drawings
FIG. 1 is a schematic structural diagram of an air inlet intermittent heating control system of a commercial vehicle engine based on a state machine, which is disclosed by the invention;
FIG. 2 is a schematic flow diagram of the intake air preheat logic control module of the control system of the present invention;
fig. 3 is a schematic diagram of a preheat relay.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic flow chart of the control system, and the specific control process is as follows:
when a driver opens a key door switch to power on a vehicle and an engine controller, the control system starts to work, the atmospheric temperature, the cooling liquid temperature of an engine, the air inlet temperature, the rotating speed and the starting state information are collected through an atmospheric temperature sensor, a cooling liquid temperature sensor, an air inlet temperature sensor and the like, the information is converted into input information which can be identified and applied by the control system through interface information in a sensor collection module, and the input information is transmitted to an air inlet preheating logic control module.
In the intake air preheating logic control module, an intake air preheating initialization state is firstly entered, the whole intake air preheating logic control module is mainly initialized, and then the intake air preheating state before starting in the preheating state before starting is switched to.
In the preheating state before starting, the intake preheating logic control module averages the four temperatures of the coolant temperature, the intake temperature, the fuel temperature and the atmospheric temperature to obtain the current engine body temperature, then, with the current engine body temperature as an X axis and the atmospheric pressure as a Y axis, a heating time table P1 is inquired to obtain the continuous preheating time t1 before starting, the preheating command output in the time t1 is activated, the engine enters a preheating state before starting and after preheating in the preheating state before starting after the time t1, and the output state is the preheating command which is not activated at the moment.
TABLE P1
| Pressure (kpa) \ temperature (. degree. 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 |
When an air inlet preheating logic control module monitors that a driver ignites an engine, a preheating state before starting is switched to a heating state during starting, the air inlet heating state during starting is firstly entered, the air inlet preheating logic control module averages the temperature of cooling liquid, the temperature of air inlet, the temperature of fuel oil and the temperature of atmosphere to obtain the current temperature of a machine body, then the current temperature of the machine body is taken as an X axis, a heating time table P2 is inquired, the continuous air inlet heating time t2 during starting is obtained, a preheating instruction output within the time t2 is activated, the machine enters a waiting state after the air inlet heating during starting after the time t2, and the output preheating instruction is not activated at the moment;
TABLE P2
| Temperature (. degree.C.) | -40 | -30.016 | -20 | -10.016 | 0 | 10.016 | 50.016 | 120 |
| Time(s) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
When the intake preheating logic control module monitors the successful starting state of the engine, the module is switched from the heating state during starting to the heating state after starting, firstly, the intake preheating logic control module enters the intake heating state for the first time after the starting is successful, the intake preheating logic control module calculates the current engine body temperature according to the coolant temperature, the intake temperature, the fuel oil temperature and the atmospheric temperature, namely, if the running time of the engine after the starting is short, the average value of the four temperatures is still used as the current engine body temperature; if the running time after the engine is started is longer than the time HT1 obtained by inquiring the warm-up time table H1 by taking the average value of the four temperatures as the X axis, the temperature of the cooling liquid is taken as the current body temperature to participate in the subsequent calculation. After the current body temperature is obtained, the current body temperature is taken as an X axis, the atmospheric pressure is taken as a Y axis, a heating time table P3 is inquired, the first air inlet heating time t3 after starting is obtained, the preheating command output within the time t3 is activated, the engine enters a waiting state after the air inlet heating is successfully started after the time t3, and the output preheating command is not activated.
TABLE H1
TABLE P3
| Pressure (kpa) \ temperature (. degree. 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 |
When the vehicle is in a waiting state after the intake air is heated after the starting is successful, the intermittent heating time table P4 is inquired by taking the current cooling liquid temperature as an X axis and the atmospheric temperature as a Y axis to obtain the intermittent heating time t4, and the intermittent heating number table P5 is inquired by taking the current cooling liquid temperature as an X axis and the atmospheric temperature as a Y axis to obtain the intermittent heating number n. And then jumping to an air inlet intermittent heating state after the starting is successful, and carrying out n times of intermittent heating, wherein each time of the intermittent heating is t4, the preheating command output in the time t4 is activated, a fixed waiting time t5 exists between every two times of the intermittent heating, and the preheating command output in the time t5 is inactivated. After the intermittent heating is finished, the gas-intake heating suspension state is entered after the starting is successful. Of course, if the number of intermittent heating times is calculated as 0, the state may be switched directly from the post-startup intake air heating standby state to the post-startup successful intake air heating suspended state.
TABLE P4
| Temperature (. degree. C.) \ temperature (. degree. 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 a preheating instruction sent by the air inlet preheating logic control module, the relay control module drives the preheating relay to be closed according to the length of the received instruction, so that the high-current air inlet preheater is powered on, and the heating function is realized. The specific implementation mode is as follows: when the relay is in a normal connection state, if a heating state is expected to be started, a low level is output to an output pin of the relay, and the default high level of the other pin of the relay is matched to pull the relay, so that the high-current preheater is controlled to start working. On the contrary, if the heating state is not desired to be started, a high level is output to the output pin of the relay, and the relay is disconnected by matching with the default high level of the other pin of the relay, so that the working state of the high-current preheater is stopped.
Namely, if a preheating activation command lasting for t1 time is received in the preheating stage before starting, the preheating relay is driven to be attracted for t1 time, so that power is supplied to the large-current air inlet preheater, the large-current air inlet preheater starts to work, and the function of preheating the air inlet before starting is realized for t1 time.
If a preheating activation command lasting for t2 time is received in the heating stage during starting, the preheating relay is driven to be attracted for t2 time, so that power is supplied to the large-current air inlet preheater, the large-current air inlet preheater starts to work, and the air inlet heating function during starting is realized for t2 time.
If a preheating activation command lasting for t3 time is received in the heating stage after starting, the preheating relay is driven to be attracted for t3 time, so that power is supplied to the high-current air inlet preheater, the high-current air inlet preheater starts to work, and the heating function of first air inlet after starting is realized for t3 time.
If a preheating activation command lasting for t4 time is received in the heating stage after starting, the preheating relay is driven to be attracted for t4 time, so that power is supplied to the large-current air inlet preheater, the large-current air inlet preheater starts to work, and the intermittent heating function after starting is realized for t4 time.
Further, when the control system is in a preheating state before starting or a heating state during starting, the voltage condition of the current storage battery is monitored in real time, if the voltage value of the current storage battery is lower than a certain set value L1, the current preheating state before starting or the heating state during starting is exited, a waiting state after the heating state after starting is successfully started is entered, and the basic functions of the storage battery are preferentially ensured to be realized. After the driver successfully starts the vehicle, the problem of insufficient combustion after the engine is started is solved by intermittent heating after the successful start.
Further, if any one of the four temperature sensors, such as a fuel temperature sensor, has a fault, only the average value of the coolant temperature, the intake air temperature and the temperature collected by the atmospheric temperature sensor is calculated to obtain the current body temperature for subsequent calculation, regardless of the output value of the sensor.
Further, in order to prevent the cold phenomenon caused by long-term un-starting of the engine after the successful preheating, the intake preheating logic control module also comprises a reinitialization strategy of the preheating function, namely, if the waiting state after the intake air preheating before the starting exceeds a period of time, the state machine automatically jumps to the initialization state, then entering a preheating state before starting, calculating the current body temperature, inquiring a heating time table P1 by taking the current body temperature as an X axis and the atmospheric pressure as a Y axis to obtain the continuous preheating time t1 before starting, the preheating command output in the time t1 is activated, the preheating state before starting is entered after the time t1, the preheating command output at the time is deactivated, and the like, therefore, the phenomena of overheating, storage battery power shortage, relay burnout and the like caused by continuous heating are avoided, and a cold machine caused by long-term non-starting of a driver is avoided.
Further, the actuation or disconnection of the control relay controls whether the large current preheater works or not, and the specific implementation mode is as follows: when the relay is in a normal connection state, if a heating state is expected to be started, a low level is output to an output pin of the relay, and the default high level of the other pin of the relay is matched to pull the relay, so that the high-current preheater is controlled to start working. On the contrary, if the heating state is not desired to be started, a high level is output to the output pin of the relay, and the relay is disconnected by matching with the default high level of the other pin of the relay, so that the working state of the high-current preheater is stopped.
The invention can greatly reduce the problem of power shortage of the storage battery caused by extensive heating, and particularly has good solving effects on the problems of insufficient combustion and smoke emission of the exhaust pipe caused by lack of intake air heating after starting.
The above description is only for the specific embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (2)
1. A commercial vehicle engine air inlet intermittent heating control system based on a state machine is characterized by comprising a sensor acquisition module, an air inlet preheating logic control module and a relay control module;
the sensor acquisition module is used for acquiring the atmospheric temperature, the temperature of cooling liquid of the engine, the air inlet temperature, the fuel temperature, the rotating speed and the starting state information, converting the interface information and transmitting the information to the air inlet preheating logic control module;
the intake preheating logic control module is used for dividing the starting state of the engine into three stages of preheating before starting, heating during starting and heating after starting;
in the preheating stage before starting, the intake preheating logic control module averages the temperature of cooling liquid, the temperature of intake air, the temperature of fuel oil and the atmospheric temperature to obtain the current temperature of a machine body, then, with the current temperature of the machine body as an X axis and the atmospheric pressure as a Y axis, a heating time table P1 is inquired to obtain the continuous preheating time t1 before starting, the preheating command output within the time t1 is activated, the machine enters a preheating and after-starting waiting state after the time t1, and the preheating command output at the moment is not activated;
TABLE P1
In the heating stage during starting, the intake preheating logic control module averages the temperature of cooling liquid, the temperature of intake air, the temperature of fuel oil and the atmospheric temperature to obtain the current temperature of the engine body, then, with the current temperature of the engine body as an X axis, a heating time table P2 is inquired to obtain the continuous intake heating time t2 in the starting process, the preheating command output within the time t2 is activated, the engine enters a standby state after intake heating in the starting process after the time t2, and the output preheating command is not activated at the moment;
TABLE P2
In the heating stage after starting, the intake preheating logic control module calculates the current engine body temperature according to the coolant temperature, the intake air temperature, the fuel oil temperature and the atmospheric temperature, firstly, the average value of the four temperatures is calculated, a look-up table H1 obtains time T1, if T1 is greater than the operation time of the engine after starting, the average value is used as the current engine body temperature, and if T1 is less than the operation time of the engine after starting, the coolant temperature is used as the current engine body temperature; inquiring a heating time table P3 by taking the current body temperature as an X axis and the atmospheric pressure as a Y axis to obtain the first air inlet heating time t3 after starting, wherein the preheating command output within the time t3 is activated, the air inlet heating waiting state after the starting is successful is entered after the time t3, and the output preheating command is not activated at the moment;
TABLE H1
TABLE P3
When the air inlet is in a waiting state after the air inlet is heated after the air inlet is started successfully, inquiring an intermittent heating time table P4 by taking the current cooling liquid temperature as an X axis and the atmospheric temperature as a Y axis to obtain intermittent heating time t4, inquiring an intermittent heating number table P5 by taking the current cooling liquid temperature as an X axis and the atmospheric temperature as a Y axis to obtain intermittent heating times n, then carrying out intermittent heating for n times, wherein the intermittent heating time is t4 each time, a preheating command output within t4 time is activated, a fixed waiting time t5 exists between every two intermittent heating times, and the preheating command output within t5 time is inactivated; wherein t5 is 120 s;
TABLE P4
TABLE P5
The relay control module is used for receiving a preheating instruction output by the air inlet preheating logic control module and detecting the electrical fault state of the preheating relay; if a preheating activation instruction with the duration time t is received, the preheating relay is driven to be attracted for the duration time t, so that the large-current air inlet preheater is powered, the large-current air inlet preheater starts to work, and the air inlet heating function is realized after the duration time t.
2. The control method of the state-machine-based commercial vehicle engine air inlet intermittent heating control system is characterized by comprising the following specific steps of:
the method comprises the following steps: the method comprises the steps that a sensor acquisition module is used for acquiring atmospheric temperature, coolant temperature of an engine, intake air temperature, fuel oil temperature, rotating speed and starting state information, a characteristic chart provided by each sensor supplier is subjected to table lookup to obtain input information which can be identified and applied by a control system, and then the input information is transmitted to an intake preheating logic control module;
step two: in the intake preheating logic control module, a state machine method is adopted, according to the information input by the sensor acquisition module, the heating time length, the intake intermittent heating time length and the heating waiting time length of the intake before, during and after starting are calculated, and an intake heating instruction is obtained and transmitted to the relay control module;
step three: in the relay control module, the preheating relay is driven to be closed or disconnected according to an air inlet heating instruction input by the air inlet preheating logic control module, so that power supply or power failure of the high-current air inlet preheater is realized, and finally, the heating function of air inlet under different working conditions is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811379971.6A CN109404176B (en) | 2018-11-20 | 2018-11-20 | State machine-based commercial vehicle engine air inlet intermittent heating control system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811379971.6A CN109404176B (en) | 2018-11-20 | 2018-11-20 | State machine-based commercial vehicle engine air inlet intermittent heating control system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109404176A CN109404176A (en) | 2019-03-01 |
| CN109404176B true CN109404176B (en) | 2020-12-15 |
Family
ID=65474066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811379971.6A Active CN109404176B (en) | 2018-11-20 | 2018-11-20 | State machine-based commercial vehicle engine air inlet intermittent heating control system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109404176B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110185559B (en) * | 2019-06-29 | 2020-09-29 | 潍柴动力股份有限公司 | Intake air heating control method, device and system |
| CN115163354B (en) * | 2022-07-20 | 2024-04-02 | 徐州徐工挖掘机械有限公司 | Engine intake preheating sectional control method and engineering machinery |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60116859A (en) * | 1983-11-28 | 1985-06-24 | Toyota Motor Corp | Method of improving starting performance of diesel engine |
| JPS6176752A (en) * | 1984-09-19 | 1986-04-19 | Toyota Motor Corp | Method of controlling heating of intake-air in internal-combustion engine |
| JP3617572B2 (en) * | 1996-05-07 | 2005-02-09 | 国産電機株式会社 | Energization control method for intake preheater for diesel engine |
| CN202628360U (en) * | 2012-06-28 | 2012-12-26 | 潍柴动力扬州柴油机有限责任公司 | Heating system of non-electric control engine |
| CN106321320A (en) * | 2016-08-24 | 2017-01-11 | 东风汽车公司 | Programmable type automobile cold start control system and method |
| CN108661839B (en) * | 2017-03-30 | 2020-05-19 | 中国航空工业集团公司西安航空计算技术研究所 | Diesel engine grid heating control method based on state machine |
| CN108204324A (en) * | 2017-12-08 | 2018-06-26 | 中国北方发动机研究所(天津) | A kind of diesel engine plateau cold start pre-heating mean |
-
2018
- 2018-11-20 CN CN201811379971.6A patent/CN109404176B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109404176A (en) | 2019-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3093171B1 (en) | Hybrid vehicle and air-conditioning system thereof | |
| CN108281735B (en) | Battery heat-insulation system and method for electric automobile | |
| CN109404176B (en) | State machine-based commercial vehicle engine air inlet intermittent heating control system and method | |
| CN110880628B (en) | Battery temperature pretreatment and battery thermal management method based on temperature change rate | |
| US9476340B2 (en) | Vehicle with stirling engine integrated into engine exhaust system | |
| KR20070108071A (en) | Method of operating glow plugs in diesel engines | |
| CN108859814B (en) | Charging control method and device for hybrid electric vehicle and vehicle | |
| CN103410591A (en) | Exhaust gas heat exchange system of automobile engine | |
| CN103147898A (en) | Starting control system and starting controlling method for engine of engineering machinery | |
| CN104696127A (en) | Preheating system for automobile engine and controlling method for preheating system | |
| CN104110341B (en) | A kind of pre-heating system of motor vehicle driven by mixed power cold start and method | |
| CN114407874B (en) | Catalytic converter ignition control method and control system of plug-in hybrid electric vehicle | |
| CN103397968B (en) | A kind of diesel engine low temp. starting method and device | |
| CN105134444A (en) | Diesel engine automatic preheating device | |
| CN112012864A (en) | Preheating system of multi-working-mode locomotive and control method thereof | |
| CN109878522B (en) | Natural gas engine matched hybrid power start-stop control method | |
| CN114776432B (en) | Waste heat recovery control system | |
| CN217632644U (en) | Hybrid electric vehicle system for active drag-down cooling supercharger application | |
| CN103452731B (en) | A kind of heating system in advance for reduce engine motor-car cold start emission | |
| CN111959347B (en) | Control method of parking heater for battery pack | |
| CN112576332B (en) | Quick starting and warming device for air-cooled internal combustion engine in low-temperature high-altitude environment | |
| CN104859633A (en) | Method and device for controlling hybrid automobile | |
| CN104976012A (en) | Intelligent start-stop system and method used for industrial vehicle | |
| CN105781847A (en) | Circulation water system of generator car | |
| CN212272414U (en) | Auxiliary starting device of mining truck diesel engine under low-temperature weather condition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |