CN111103071B - Fault diagnosis method and system for air inlet temperature sensor of vehicle and engine - Google Patents
Fault diagnosis method and system for air inlet temperature sensor of vehicle and engine Download PDFInfo
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- CN111103071B CN111103071B CN201811259842.3A CN201811259842A CN111103071B CN 111103071 B CN111103071 B CN 111103071B CN 201811259842 A CN201811259842 A CN 201811259842A CN 111103071 B CN111103071 B CN 111103071B
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Abstract
The invention belongs to the technical field of electronics, and provides a fault diagnosis method and system for an air inlet temperature sensor of a vehicle or an engine. In the invention, after a notification instruction for fault detection of an air inlet temperature sensor of an engine is detected, whether the engine enters a supercharging state is confirmed, and after the engine is detected to enter the supercharging state, a first air inlet temperature in the engine obtained by the air inlet temperature sensor is recorded, and a turbocharger is controlled to continuously supercharge the engine; the time for continuously supercharging the engine by the turbocharger is monitored, and when the time reaches a target value, the second air inlet temperature in the engine, which is acquired by the air inlet temperature sensor, is recorded, so that whether the air inlet temperature sensor breaks down or not is determined according to the first air inlet temperature and the second air inlet temperature, no other sensor signal is needed to be referred, misjudgment caused by reference to abnormal sensor signals is reduced, the diagnosis accuracy is improved, the diagnosis real-time performance is improved, and the driving safety is improved.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a fault diagnosis method and system for an air inlet temperature sensor of a vehicle or an engine.
Background
With the social development progress, the automobile holding capacity is increased, the world environmental pollution problem is increasingly serious, the emission requirement of the supervision organization On the automobile industry is more and more strict, the emission monitoring means is more and more comprehensive, the On-Board Diagnostic (OBD) regulation is also continuously upgraded, and the corresponding matching calibration work is more and more complicated.
As an important diagnostic technique in an on-board diagnostic system OBD, the current fault diagnosis method for an intake temperature sensor mainly comprises the following steps: and after the vehicle is immersed for a sufficient long time, comparing the difference value of the air inlet temperature and the cooling liquid temperature within one minute after the engine is started, and if the absolute value of the difference value of the air inlet temperature and the cooling liquid temperature is greater than a threshold value, determining that the air inlet temperature sensor at the moment is in failure.
However, although the method can detect whether the engine intake air temperature sensor is in failure, the method on one hand depends too much on the coolant temperature sensor, and if the coolant temperature sensor is in failure, false alarm of failure of the intake air temperature sensor is easily caused, and on the other hand, the method can perform failure diagnosis only after long-time vehicle immersion, so that the effective diagnosis times per day are less, and failure cannot be detected in the driving process, and driving safety is affected.
Therefore, it is necessary to provide a technical solution to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a fault diagnosis method and a fault diagnosis system for an air inlet temperature sensor of a vehicle or an engine, which do not need to refer to other sensor signals, reduce misjudgment caused by abnormal reference sensor signals, improve the diagnosis accuracy, increase the effective diagnosis times, improve the diagnosis real-time property and improve the driving safety.
The present invention is achieved as described above, and an intake air temperature sensor fault diagnosis method for an engine, the intake air temperature sensor fault diagnosis method including:
after a notification instruction for fault detection of an air inlet temperature sensor of an engine is detected, whether the engine enters a supercharging state or not is confirmed;
after the engine is confirmed to enter a supercharging state, recording a first intake air temperature in the engine, which is obtained by the intake air temperature sensor, and controlling a turbocharger to continuously supercharge the engine;
monitoring the time for continuously supercharging the engine by the turbocharger, and recording a second intake air temperature in the engine, which is acquired by the intake air temperature sensor, when the time reaches a target value;
and calculating a difference value between the first air inlet temperature and the second air inlet temperature, and determining that the air inlet temperature sensor has a fault when the difference value is smaller than a preset threshold value.
Another object of the present invention is to provide an intake air temperature sensor failure diagnosis system of an engine, including: an engine controller, an intake air temperature sensor, and a turbocharger;
the air inlet temperature sensor is arranged in an engine and is connected with the engine controller, the turbocharger is connected with the engine controller, and the engine controller is connected with the engine;
the engine controller is used for confirming whether the engine enters a supercharging state or not after detecting a notification instruction for fault detection of an air inlet temperature sensor of the engine, recording a first air inlet temperature in the engine acquired by the air inlet temperature sensor after confirming that the engine enters the supercharging state, and controlling a turbocharger to continuously supercharge the engine;
the engine controller is further used for monitoring the time for continuously supercharging the engine by the turbocharger and recording a second intake air temperature in the engine, which is acquired by the intake air temperature sensor, when the time reaches a target value; and calculating a difference value between the first intake air temperature and the second intake air temperature, and determining that the intake air temperature sensor fails when the difference value is smaller than a preset threshold value.
Another object of the present invention is to provide a vehicle including the intake air temperature sensor failure diagnosis system of the engine described above.
In the invention, after a notification instruction for fault detection of an air inlet temperature sensor of an engine is detected, whether the engine enters a supercharging state is confirmed, and after the engine is detected to enter the supercharging state, a first air inlet temperature in the engine obtained by the air inlet temperature sensor is recorded, and a turbocharger is controlled to continuously supercharge the engine; the time that the turbocharger continuously supercharges the engine is monitored, and when the time reaches a target value, the second air inlet temperature in the engine, which is obtained by the air inlet temperature sensor, is recorded, so that whether the air inlet temperature sensor breaks down or not is determined according to the first air inlet temperature and the second air inlet temperature, no other sensor signal is needed to be referred, misjudgment caused by reference to abnormal sensor signals is reduced, the diagnosis accuracy is improved, meanwhile, the effective diagnosis times are increased, the diagnosis real-time performance is improved, and the driving safety is improved.
Drawings
FIG. 1 is a schematic flow chart illustrating an implementation of a fault diagnosis method for an intake air temperature sensor of an engine according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating an implementation of a fault diagnosis method for an intake air temperature sensor of an engine according to another embodiment of the present invention;
fig. 3 is a schematic block diagram of an intake air temperature sensor fault diagnosis system of an engine according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of implementations of the invention refers to the accompanying drawings in which:
fig. 1 shows a flow of implementing a fault diagnosis method for an intake air temperature sensor of an engine according to an embodiment of the present invention, where the fault diagnosis method for the intake air temperature sensor of the engine includes the following steps:
step S11: after a notification command for detecting a failure of an intake air temperature sensor of an engine is detected, it is confirmed whether the engine enters a supercharging state.
In the embodiment of the present invention, when embodied, the main execution body of step S11 is an engine controller in the vehicle, that is, an Electronic Control Unit (ECU) in the vehicle for controlling the engine. The instruction for detecting the failure detection of the intake air temperature sensor of the engine is: after the vehicle is powered on, the ECU carries out the action of fault detection on an air inlet temperature sensor of the engine in real time, so that after the vehicle is powered on, the ECU firstly confirms whether the engine enters a supercharging state or not under the action.
Step S12: after the engine is confirmed to enter a supercharging state, recording a first intake air temperature in the engine acquired by the intake air temperature sensor, and controlling a turbocharger to continuously supercharge the engine.
In the embodiment of the present invention, the execution subject of step S12 also controls the ECU of the engine when embodied. After the ECU confirms that the engine enters a supercharging state, the ECU records a first intake air temperature in the engine acquired by an intake air temperature sensor and controls the turbocharger to continuously supercharge the engine.
In the embodiment of the present invention, the intake air temperature sensor is a negative temperature coefficient thermistor that is provided in the engine and detects the temperature in the engine so that the ECU confirms whether the engine is operating normally, and the resistance value thereof decreases as the internal temperature of the engine increases.
Step S13: and monitoring the time for continuously supercharging the engine by the turbocharger, and recording a second air inlet temperature in the engine, which is acquired by the air inlet temperature sensor, when the time reaches a target value.
In the embodiment of the present invention, the time target value is set as needed, and preferably 20 seconds is used in the embodiment. When the ECU controls the turbocharger to continuously supercharge the engine in step S12, in order to record the temperature of the engine in the supercharged state well, the present embodiment preferably records the second intake air temperature in the engine acquired by the intake air temperature sensor at the moment after continuously supercharging the engine for 20 seconds.
Step S14: and calculating a difference value between the first air inlet temperature and the second air inlet temperature, and determining that the air inlet temperature sensor has a fault when the difference value is smaller than a preset threshold value.
In the embodiment of the present invention, when implemented, the execution subject of step S14 is also an ECU for controlling the engine, and the preset threshold is set according to actual requirements, preferably 0.5 ℃, and is not limited herein.
Further, the equation for the ideal gas state equation is as follows:
P*V＝n*R*T (1)；
wherein P is the pressure of the ideal gas, V is the volume of the ideal gas, n represents the amount of gaseous species, R is the ideal gas constant, and T is the thermodynamic temperature of the ideal gas;
therefore, according to the law of conservation of energy, after the engine is supercharged, the above formula (1) can be evolved into the following formula:
P*V/T＝P0*V0/T 0 (2)；
where P0 is the pressure after pressurization, V0 is the volume after pressurization, and T0 is the thermodynamic temperature after pressurization.
Further, from equation (2), the following equation can be derived:
T0＝P0*V0*T/(P*V) (3)；
since the volume before and after supercharging is not changed due to the restriction of the engine intake structure, the following formula can be obtained from formula (3):
T0＝P0*T/P (3)；
as can be seen from the above formula (4), when the engine enters the supercharging state, the pressure P0 increases, which results in an increase in T0, i.e., the supercharged intake air temperature increases, i.e., when the engine enters the supercharging state, and the volume of the gas is not changed, the temperature of the gas will inevitably increase, so that when the difference between the recorded first intake air temperature and the second intake air temperature is very small, i.e., smaller than the preset threshold, it can be determined whether the intake air temperature sensor is faulty.
In the embodiment, after a notification instruction for fault detection of an air inlet temperature sensor of an engine is detected, whether the engine enters a supercharging state is confirmed, and after the condition that the engine enters the supercharging state is detected, a first air inlet temperature in the engine, which is obtained by the air inlet temperature sensor, is recorded, and a turbocharger is controlled to continuously supercharge the engine; the time that the turbocharger continuously supercharges the engine is monitored, and when the time reaches a target value, the second air inlet temperature in the engine, which is obtained by the air inlet temperature sensor, is recorded, so that whether the air inlet temperature sensor breaks down or not is determined according to the first air inlet temperature and the second air inlet temperature, no other sensor signal is needed to be referred, misjudgment caused by reference to abnormal sensor signals is reduced, the diagnosis accuracy is improved, meanwhile, the effective diagnosis times are increased, the diagnosis real-time performance is improved, and the driving safety is improved.
Fig. 2 shows a flow of implementing a fault diagnosis method for an intake air temperature sensor of an engine according to another embodiment of the present invention, the fault diagnosis method for the intake air temperature sensor of the engine includes the following steps:
step S21: after a notification command for detecting a failure of an intake air temperature sensor of an engine is detected, it is confirmed whether the engine enters a supercharging state.
In the embodiment of the present invention, when embodied, the main execution body of step S11 is an engine controller in the vehicle, that is, an Electronic Control Unit (ECU) in the vehicle for controlling the engine. The instruction for detecting the failure detection of the intake air temperature sensor of the engine is: after the vehicle is powered on, the ECU carries out the action of fault detection on an air inlet temperature sensor of the engine in real time, so that after the vehicle is powered on, the ECU firstly confirms whether the engine enters a supercharging state or not under the action.
Further, in the embodiment of the present invention, the determination of whether the engine enters the supercharging state in step S21 is specifically:
acquiring the depth of an accelerator pedal, the current rotating speed of an engine, the current pressure of the engine and the current gear state of a vehicle monitored by an automatic gearbox control unit;
and if the depth of the accelerator pedal is greater than the preset depth, the current rotating speed of the engine is greater than the preset rotating speed, the current pressure of the engine is greater than the preset pressure, and the current gear state of the vehicle is in a common forward gear, the engine is identified to enter a supercharging state.
In the embodiment of the invention, during implementation, the ECU monitors the depth of an accelerator pedal, the current rotating speed of an engine and the current pressure of the engine in real time, and the TCU monitors the current gear state of the vehicle and sends the detected gear state to the ECU. After the ECU acquires the data, the depth of the accelerator pedal is compared with the preset depth, the preset rotating speed of the current rotating speed domain of the engine is compared, the current pressure of the engine is compared with the preset pressure, whether the current gear state of the vehicle is in a common forward gear (D gear) or a sport gear (S gear) or not is checked, and when the depth of the accelerator pedal is greater than fifty percent, the current rotating speed of the engine is greater than 1300 revolutions, the current pressure of the engine is greater than 110Ka, and the current gear state of the vehicle is in the D gear or the S gear, the engine is identified to enter a supercharging state.
It should be noted that, in the embodiment of the present invention, the D gear is a forward gear used when the vehicle runs on a general road surface, and is also one of the most common gears; the S gear refers to a gear of a vehicle motion mode, can be used regardless of vehicle climbing and sprinting or quick overtaking, and can automatically downshift when the S gear is used, so that the rotating speed of an engine is increased, the torque output is increased, and larger power is obtained.
Step S22: after the engine is confirmed to enter a supercharging state, recording a first intake air temperature in the engine acquired by the intake air temperature sensor, and controlling a turbocharger to continuously supercharge the engine.
In the embodiment of the present invention, the execution subject of step S12 also controls the ECU of the engine when embodied. After the ECU confirms that the engine enters a supercharging state, the ECU records a first intake air temperature in the engine acquired by an intake air temperature sensor and controls the turbocharger to continuously supercharge the engine.
In the embodiment of the present invention, the intake air temperature sensor is a negative temperature coefficient thermistor that is provided in the engine and detects the temperature in the engine so that the ECU confirms whether the engine is operating normally, and the resistance value thereof decreases as the internal temperature of the engine increases.
Step S23: and monitoring the time for continuously supercharging the engine by the turbocharger, and recording a second air inlet temperature in the engine, which is acquired by the air inlet temperature sensor, when the time reaches a target value.
In the embodiment of the present invention, the time target value is set as needed, and preferably 20 seconds is used in the embodiment. When the ECU controls the turbocharger to continuously supercharge the engine in step S12, in order to record the temperature of the engine in the supercharged state well, the present embodiment preferably records the second intake air temperature in the engine acquired by the intake air temperature sensor at the moment after continuously supercharging the engine for 20 seconds.
Step S24: and calculating a difference value between the first air inlet temperature and the second air inlet temperature, and determining that the air inlet temperature sensor has a fault when the difference value is smaller than a preset threshold value.
In the embodiment of the present invention, when implemented, the execution subject of step S14 is also an ECU for controlling the engine, and the preset threshold is set according to actual requirements, preferably 0.5 ℃, and is not limited herein.
Further, the equation for the ideal gas state equation is as follows:
P*V＝n*R*T (1)；
wherein P is the pressure of the ideal gas, V is the volume of the ideal gas, n represents the amount of gaseous species, R is the ideal gas constant, and T is the thermodynamic temperature of the ideal gas;
therefore, according to the law of conservation of energy, after the engine is supercharged, the above formula (1) can be evolved into the following formula:
P*V/T＝P0*V0/T 0 (2)；
where P0 is the pressure after pressurization, V0 is the volume after pressurization, and T0 is the thermodynamic temperature after pressurization.
Further, from equation (2), the following equation can be derived:
T0＝P0*V0*T/(P*V) (3)；
since the volume before and after supercharging is not changed due to the restriction of the engine intake structure, the following formula can be obtained from formula (3):
T0＝P0*T/P (3)；
as can be seen from the above formula (4), when the engine enters the supercharging state, the pressure P0 increases, which results in an increase in T0, i.e., the supercharged intake air temperature increases, i.e., when the engine enters the supercharging state, and the volume of the gas is not changed, the temperature of the gas will inevitably increase, so that when the difference between the recorded first intake air temperature and the second intake air temperature is very small, i.e., smaller than the preset threshold, it can be determined whether the intake air temperature sensor is faulty.
In the embodiment of the invention, the fault of the air inlet temperature sensor is determined by the difference value of the air inlet temperature sensors of the engine in different states, so that the fault diagnosis method of the air inlet temperature sensor provided by the invention does not excessively depend on a reference signal, thereby eliminating the defect that the fault of the temperature sensor cannot be timely caused by misjudgment caused by depending on the reference signal; in addition, the fault diagnosis method for the intake air temperature sensor provided by the embodiment of the invention has the advantages that the fault of the intake air temperature sensor is diagnosed under the supercharging working condition of the engine during driving, so that the effective diagnosis times are increased, the intake air temperature sensor can be diagnosed in real time, and the diagnosis real-time performance is improved.
Step S25: and after the air inlet temperature sensor is determined to be in fault, acquiring the virtual air inlet temperature of the engine, calculating the oil injection pulse width of the engine according to the virtual air inlet temperature, and controlling the engine to work according to the oil injection pulse width.
In the embodiment of the present invention, the virtual intake air temperature refers to a temperature value obtained according to a temperature curve when the intake air temperature sensor is normal in a vehicle test process. After the fault of the air inlet temperature sensor of the engine is confirmed, the virtual air inlet temperature which is comparable to the recent normal temperature sensor is provided according to the normal curve of the air inlet temperature sensor, so that the ECU can calculate the oil injection pulse width of the engine according to the virtual air inlet temperature and control the normal work of the engine according to the oil injection pulse width, the vehicle fault caused by the fault of the air inlet temperature sensor is avoided, and the safety in the driving process is improved.
Further, the acquiring of the virtual intake air temperature of the engine in step S25 includes:
acquiring the external environment temperature monitored by an external environment temperature sensor and the current water temperature of the engine monitored by a cooling liquid temperature sensor;
and acquiring the virtual air inlet temperature of the engine according to the external environment temperature and the current water temperature of the engine.
In the embodiment of the invention, after the ECU confirms that the intake air temperature sensor of the engine has a fault, the external temperature sensor monitors the external environment temperature of the vehicle and feeds the monitored temperature back to the ECU, and the coolant temperature sensor monitors the temperature of the engine in real time and feeds the monitored temperature back to the ECU, so that the ECU can acquire the virtual intake air temperature of the engine according to the external environment temperature monitored by the external environment temperature sensor and the current temperature of the engine monitored by the coolant temperature sensor.
Specifically, when the ECU obtains the virtual intake air temperature of the engine according to the external environment temperature monitored by the external environment temperature sensor and the current temperature of the engine monitored by the coolant temperature sensor, the ECU mainly obtains the virtual intake air temperature through the external environment temperature monitored by the external environment temperature sensor, the current temperature of the engine monitored by the coolant temperature sensor, and a temperature curve obtained when the intake air temperature sensor is normal in the vehicle test process.
In the embodiment, after a notification instruction for fault detection of an air inlet temperature sensor of an engine is detected, whether the engine enters a supercharging state is confirmed, and after the condition that the engine enters the supercharging state is detected, a first air inlet temperature in the engine, which is obtained by the air inlet temperature sensor, is recorded, and a turbocharger is controlled to continuously supercharge the engine; the time that the turbocharger continuously supercharges the engine is monitored, and when the time reaches a target value, the second air inlet temperature in the engine, which is obtained by the air inlet temperature sensor, is recorded, so that whether the air inlet temperature sensor breaks down or not is determined according to the first air inlet temperature and the second air inlet temperature, no other sensor signal is needed to be referred, misjudgment caused by reference to abnormal sensor signals is reduced, the diagnosis accuracy is improved, meanwhile, the effective diagnosis times are increased, the diagnosis real-time performance is improved, and the driving safety is improved.
In addition, in the embodiment, after the fault of the air inlet temperature sensor of the engine is confirmed again, the virtual air inlet temperature is provided for the engine control module according to the external environment temperature and the engine water temperature, so that the engine control module can calculate the oil injection pulse width according to the virtual air inlet temperature, the normal work of the engine is maintained, and the driving safety is improved to a great extent.
Referring to fig. 3, a schematic block diagram of an intake air temperature sensor diagnostic system 3 of an engine according to an embodiment of the present invention is shown. The system operating environment synchronization apparatus 3 provided in the embodiment of the present invention includes apparatuses for executing steps in the embodiment corresponding to fig. 1 and fig. 2, and please refer to fig. 1 and fig. 2 and related descriptions in the embodiment corresponding to fig. 1 and fig. 2, which are not described herein again. The intake air temperature sensor diagnostic system 3 of the engine according to the embodiment of the present invention includes an engine controller 30, an intake air temperature sensor 31, a turbocharger 32, an external ambient temperature sensor 33, a coolant temperature sensor 34, an accelerator pedal 35, and an automatic transmission control unit 36.
An intake air temperature sensor 31 is provided in an engine (not shown) and connected to an engine controller 30, a turbocharger 32 is connected to the engine controller 301, the engine controller 30 is connected to the engine, and an external ambient temperature sensor 33, a coolant temperature sensor 34, an accelerator pedal 35, and an automatic transmission control unit 36 are similarly connected to the engine controller 30.
Specifically, the engine controller 30 is configured to, after detecting a notification instruction for performing fault detection on an intake air temperature sensor 31 of the engine, confirm whether the engine enters a supercharging state, and after confirming that the engine enters the supercharging state, record a first intake air temperature in the engine acquired by the intake air temperature sensor 31, and control the turbocharger 32 to continuously supercharge the engine.
Further, the engine controller 30 is further configured to monitor a time during which the turbocharger 32 continuously supercharges the engine, and record a second intake air temperature in the engine, which is obtained by the intake air temperature sensor 31, when the time reaches a target value; and calculates a difference between the first intake air temperature and the second intake air temperature, and determines that the intake air temperature sensor 31 is malfunctioning when the difference is smaller than a preset threshold value.
Further, the engine controller 30 is further configured to obtain a virtual intake air temperature of the engine after determining that the intake air temperature sensor fails, calculate an oil injection pulse width of the engine according to the virtual intake air temperature, and control the engine to operate according to the oil injection pulse width.
Further, an external ambient temperature sensor 33 is used to monitor the external ambient temperature; the coolant temperature sensor 34 is used to monitor the current water temperature of the engine; the engine controller 30 is specifically configured to acquire the external environment temperature monitored by the external environment temperature sensor 33 and the current water temperature of the engine monitored by the coolant temperature sensor 34, and acquire the virtual intake air temperature of the engine based on the external environment temperature and the current water temperature of the engine.
Further, the automatic transmission control unit 36 is used to monitor the current gear state of the vehicle; the engine controller 30 is configured to obtain a depth of an accelerator pedal, a current rotational speed of the engine, a current pressure of the engine, and a current gear state of the vehicle monitored by the automatic transmission control unit 36, and identify that the engine enters a supercharging state if the depth of the accelerator pedal is greater than a preset depth, the current rotational speed of the engine is greater than a preset rotational speed, the current pressure of the engine is greater than a preset pressure, and the current gear state of the vehicle is in a normal forward gear.
Further, the engine controller 30 is further configured to recognize that the engine enters the supercharging state when the accelerator pedal depth is greater than the preset depth, the current rotation speed of the engine is greater than the preset rotation speed, the current pressure of the engine is greater than the preset pressure, and the current gear state of the vehicle is in the sport gear.
In the embodiment, the intake air temperature sensor diagnosis system 3 of the engine confirms whether the engine enters a supercharging state or not by detecting a notification instruction for fault detection of the intake air temperature sensor of the engine, records a first intake air temperature in the engine obtained by the intake air temperature sensor after detecting that the engine enters the supercharging state, and controls the turbocharger to continuously supercharge the engine; the time that the turbocharger continuously supercharges the engine is monitored, and when the time reaches a target value, the second air inlet temperature in the engine, which is obtained by the air inlet temperature sensor, is recorded, so that whether the air inlet temperature sensor breaks down or not is determined according to the first air inlet temperature and the second air inlet temperature, no other sensor signal is needed to be referred, misjudgment caused by reference to abnormal sensor signals is reduced, the diagnosis accuracy is improved, meanwhile, the effective diagnosis times are increased, the diagnosis real-time performance is improved, and the driving safety is improved.
In addition, in the embodiment, after the intake air temperature sensor diagnostic system 3 of the engine reconfirms the intake air temperature sensor of the engine to be faulty, the virtual intake air temperature is provided to the engine control module according to the external environment temperature and the engine water temperature, so that the engine control module calculates the fuel injection pulse width according to the virtual intake air temperature, thereby maintaining the normal operation of the engine and greatly improving the driving safety.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An intake air temperature sensor fault diagnosis method of an engine, characterized by comprising:
after a notification instruction for fault detection of an air inlet temperature sensor of an engine is detected, whether the engine enters a supercharging state or not is confirmed;
after the engine is confirmed to enter a supercharging state, recording a first intake air temperature in the engine, which is obtained by the intake air temperature sensor, and controlling a turbocharger to continuously supercharge the engine;
monitoring the time for continuously supercharging the engine by the turbocharger, and recording a second intake air temperature in the engine, which is acquired by the intake air temperature sensor, when the time reaches a target value;
and calculating a difference value between the first air inlet temperature and the second air inlet temperature, and determining that the air inlet temperature sensor has a fault when the difference value is smaller than a preset threshold value.
2. The intake air temperature sensor malfunction diagnosis method according to claim 1, characterized in that the malfunction diagnosis method further includes:
after the air inlet temperature sensor is determined to be in fault, the virtual air inlet temperature of the engine is obtained through the external environment temperature, the current water temperature of the engine and a temperature curve when the air inlet temperature sensor is normal in the vehicle test process, the oil injection pulse width of the engine is calculated according to the virtual air inlet temperature, and the engine is controlled to work according to the oil injection pulse width.
3. The intake air temperature sensor fault diagnosis method according to claim 2, wherein the obtaining of the virtual intake air temperature of the engine from the outside environment temperature, the current water temperature of the engine, and the temperature profile when the intake air temperature sensor is normal during vehicle testing includes:
acquiring the external environment temperature monitored by an external environment temperature sensor and the current water temperature of the engine monitored by a cooling liquid temperature sensor;
and acquiring the virtual inlet air temperature of the engine according to the temperature curve when the inlet air temperature sensor is normal, the external environment temperature and the current water temperature of the engine in the vehicle test process.
4. The intake air temperature sensor malfunction diagnosis method according to any one of claims 1 to 3, characterized in that the confirming whether the engine enters a supercharging state includes:
acquiring the depth of an accelerator pedal, the current rotating speed of an engine, the current pressure of the engine and the current gear state of a vehicle monitored by an automatic gearbox control unit;
and if the depth of the accelerator pedal is greater than the preset depth, the current rotating speed of the engine is greater than the preset rotating speed, the current pressure of the engine is greater than the preset pressure, and the current gear state of the vehicle is in a common forward gear, the engine is identified to enter a supercharging state.
5. The intake air temperature sensor malfunction diagnosis method according to any one of claims 1 to 3, characterized in that the confirming whether the engine enters a supercharging state includes:
acquiring the depth of an accelerator pedal, the current rotating speed of an engine, the current pressure of the engine and the current gear state of a vehicle monitored by an automatic gearbox control unit;
and if the depth of the accelerator pedal is greater than the preset depth, the current rotating speed of the engine is greater than the preset rotating speed, the current pressure of the engine is greater than the preset pressure, and the current gear state of the vehicle is in a motion gear, the engine is identified to enter a supercharging state.
6. An intake air temperature sensor fault diagnosis system of an engine, characterized by comprising: an engine controller, an intake air temperature sensor, and a turbocharger;
the air inlet temperature sensor is arranged in an engine and is connected with the engine controller, the turbocharger is connected with the engine controller, and the engine controller is connected with the engine;
the engine controller is used for confirming whether the engine enters a supercharging state or not after detecting a notification instruction for fault detection of an air inlet temperature sensor of the engine, recording a first air inlet temperature in the engine acquired by the air inlet temperature sensor after confirming that the engine enters the supercharging state, and controlling a turbocharger to continuously supercharge the engine;
the engine controller is further used for monitoring the time for continuously supercharging the engine by the turbocharger and recording a second intake air temperature in the engine, which is acquired by the intake air temperature sensor, when the time reaches a target value; and calculating a difference value between the first intake air temperature and the second intake air temperature, and determining that the intake air temperature sensor fails when the difference value is smaller than a preset threshold value.
7. The intake air temperature sensor fault diagnostic system of claim 6, wherein the engine controller is specifically configured to:
and after the air inlet temperature sensor is determined to be in fault, acquiring the virtual air inlet temperature of the engine, calculating the oil injection pulse width of the engine according to the virtual air inlet temperature, and controlling the engine to work according to the oil injection pulse width.
8. The intake air temperature sensor fault diagnosis system according to claim 7, characterized by further comprising: an external ambient temperature sensor and a coolant temperature sensor;
the external environment temperature sensor is used for monitoring the external environment temperature;
the coolant temperature sensor is used for monitoring the current water temperature of the engine;
the engine controller is specifically configured to acquire an external environment temperature monitored by an external environment temperature sensor and a current water temperature of the engine monitored by a coolant temperature sensor, and acquire a virtual intake air temperature of the engine according to the external environment temperature and the current water temperature of the engine.
9. The intake air temperature sensor malfunction diagnosis system according to any one of claims 6 to 8, characterized by further comprising: an accelerator pedal and an automatic transmission control unit;
the automatic gearbox control unit is used for monitoring the current gear state of the vehicle;
the engine controller is used for obtaining the depth of an accelerator pedal, the current rotating speed of an engine, the current pressure of the engine and the current gear state of the vehicle monitored by the automatic gearbox control unit, the depth of the accelerator pedal is larger than the preset depth, the current rotating speed of the engine is larger than the preset rotating speed, the current pressure of the engine is larger than the preset pressure, and the current gear state of the vehicle is in a common forward gear, and the engine is identified to be in a supercharging state.
10. A vehicle characterized by comprising the intake air temperature sensor fault diagnosis system of the engine according to any one of claims 6 to 9.
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| CN112682143B (en) * | 2020-12-24 | 2022-04-26 | 潍柴动力股份有限公司 | DPF regeneration fault pre-judging method and device |
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