CN114776447A - Fault diagnosis method, device, terminal and storage medium for variable valve lift - Google Patents
Fault diagnosis method, device, terminal and storage medium for variable valve lift Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/083—Safety, indicating, or supervising devices relating to maintenance, e.g. diagnostic device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/082—Safety, indicating, or supervising devices relating to valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention provides a fault diagnosis method and device for variable valve lift, a terminal and a storage medium. The method comprises the following steps: when the current operation working condition of an engine of a vehicle meets a preset condition, acquiring a first pressure of an air cylinder corresponding to a measured value of an air flow meter and a second pressure of the air cylinder corresponding to a measured value of an intake manifold pressure sensor; when the first pressure and the second pressure meet a first preset condition, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift; when the first pressure and the second pressure meet a second preset condition, determining that the fault of the variable valve lift is that the variable valve lift is blocked at a high lift; and determining that the variable valve lift is fault-free when the first pressure and the second pressure meet a third preset condition. Compared with the conventional mode of monitoring the valve lift by adding the Hall sensor, the invention can reduce the cost and does not bring new difficulty to the arrangement of the engine.
Description
Technical Field
The invention relates to the technical field of vehicle fault detection, in particular to a fault diagnosis method, a fault diagnosis device, a fault diagnosis terminal and a storage medium for variable valve lift.
Background
The engine has different requirements for air intake and exhaust at various rotating speeds, the air demand is small at low rotating speed, the air demand is large at high rotating speed, and the problems of insufficient air intake and unclean exhaust of the engine are easily caused as the air intake stroke time is shorter as the rotating speed is higher, so that the efficiency of the engine is influenced.
The Variable Valve Lift (VVL) comprises a high Valve Lift and a low Valve Lift, so that the engine can be matched with different Valve Lift amounts at different rotating speeds, and simultaneously, the power output of the engine at the high rotating speed and the torque output of the engine at the low rotating speed are met. Current regulations dictate that target fault diagnosis of VVL be required, i.e., both fault cases where the target lift is high lift but actually low lift, or where the target lift is low lift but actually high lift. In the prior art, a hall sensor is generally added to monitor the valve lift so as to judge whether a target error fault occurs.
However, the failure detection method of monitoring the valve lift by adding the hall sensor causes a cost increase and also causes difficulty in the arrangement of the hall sensor in the engine.
Disclosure of Invention
The embodiment of the invention provides a fault diagnosis method, a fault diagnosis device, a fault diagnosis terminal and a storage medium for variable valve lift, and aims to solve the problems that in the prior art, the cost is increased and the arrangement of a Hall sensor in an engine is difficult due to the addition of the Hall sensor.
In a first aspect, an embodiment of the present invention provides a method for diagnosing a fault of a variable valve lift, where an air flow meter and an intake manifold pressure sensor are arranged in an engine assembly of a vehicle, and the method includes:
when the current operating condition of the engine of the vehicle meets a preset condition, acquiring a first pressure of a cylinder corresponding to the measured value of the air flow meter and a second pressure of the cylinder corresponding to the measured value of the intake manifold pressure sensor;
when the first pressure and the second pressure meet a first preset condition, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
when the first pressure and the second pressure meet a second preset condition, determining that the fault of the variable valve lift is that the variable valve lift is blocked at a high lift;
determining that the variable valve lift is fault-free when the first pressure and the second pressure satisfy a third preset condition.
In one possible implementation, the determining that the fault of the variable valve lift is that the variable valve lift is stuck at a low lift when the first pressure and the second pressure satisfy a first preset condition includes:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value is greater than a first threshold value, and calculating an integral average value of the absolute value of the difference based on all integral values of the absolute value of the difference;
when the integral average value is larger than a second threshold value and the difference value is larger than a third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
the first threshold, the second threshold, and the third threshold are all values that vary proportionally with changes in engine load, and the third threshold is greater than the first threshold and less than the second threshold.
In one possible implementation, when the first pressure and the second pressure satisfy a second preset condition, determining that the fault of the variable valve lift is that the variable valve lift is stuck at a high lift includes:
calculating an integral value of the absolute value of the difference value when the absolute value of the difference value between the first pressure and the second pressure is greater than a first threshold value, and calculating an integral average value of the absolute value of the difference value from all the integral values of the absolute value of the difference value;
when the integral average value is larger than a second threshold value and the difference value is smaller than a sixth threshold value, determining that the fault of the variable valve lift is that the target lift is a low lift and the variable valve lift is blocked at a high lift;
the first threshold, the second threshold, and the sixth threshold are all values that vary proportionally with changes in engine load, and the sixth threshold is less than the first threshold.
In one possible implementation, the determining that the variable valve lift is fault-free when the first pressure and the second pressure satisfy a third preset condition includes:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value is not greater than a first threshold;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of the new difference between the third pressure and the fourth pressure;
determining that the variable valve lift is fault-free when an integrated value of an absolute value of the new difference is less than a fifth threshold;
the first, fourth, and fifth thresholds are values that vary with engine load rather than proportionally, and are each greater than the first threshold.
In one possible implementation, the determining that the fault of the variable valve lift is that the variable valve lift is stuck at the low lift when the first pressure and the second pressure satisfy a first preset condition includes:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value is not greater than a first threshold;
repeatedly calculating an integrated value of the absolute value of the difference value when the integrated value of the absolute value of the difference value is not less than a fourth threshold value;
calculating an integral average value of the absolute values of the difference values according to all integral values of the absolute values of the difference values, and determining that the fault of the variable valve lift is that the variable valve lift is stuck at a low lift when the integral average value is larger than a second threshold and the difference value is larger than a third threshold;
the first threshold, the second threshold, the third threshold, and the fourth threshold are all values that vary proportionally with changes in engine load, and the third threshold is greater than the first threshold and less than the second threshold, and the fourth threshold is greater than the first threshold and less than the second threshold.
In one possible implementation, the determining that the fault of the variable valve lift is that the variable valve lift is stuck at the low lift when the first pressure and the second pressure satisfy a first preset condition includes:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value is not greater than a first threshold;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of a new difference between the third pressure and the fourth pressure;
repeatedly calculating the integral value of the absolute value of the new difference when the integral value of the absolute value of the new difference is not less than a fifth threshold;
calculating an integral average value of the absolute value of the new difference value according to all integral values of the absolute value of the new difference value;
when the integral average value of the absolute value of the new difference value is larger than a second threshold value and the new difference value is larger than a third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
the first threshold, the second threshold, the third threshold, the fourth threshold and the fifth threshold are all values that vary non-proportionally with changes in engine load, and the fourth threshold and the fifth threshold are both greater than the first threshold and both less than the second threshold, and the third threshold is greater than the first threshold and less than the second threshold.
In one possible implementation, the calculating an integrated average of the absolute values of the differences when the absolute values of the differences between the first pressure and the second pressure are greater than a first threshold includes:
calculating an integrated value of absolute values of the differences when the absolute values of the differences are greater than a first threshold value, and calculating an integrated average value of the absolute values of the differences from all the integrated values of the absolute values of the differences, including:
when the absolute value of the difference value between the first pressure and the second pressure is larger than a first threshold value, a plurality of sections of integration intervals are taken, and the integral value of the absolute value of the difference value corresponding to each section of integration interval is calculated;
and calculating the average value of all the integral values of the absolute values of the differences to obtain the integral average value of the absolute values of the differences.
In a second aspect, an embodiment of the present invention provides a fault diagnosis apparatus for variable valve lift, an engine assembly of a vehicle is provided with an air flow meter and an intake manifold pressure sensor, and the fault diagnosis apparatus comprises:
the acquisition module is used for acquiring first pressure of a cylinder corresponding to a measured value of the air flow meter and second pressure of the cylinder corresponding to a measured value of the intake manifold pressure sensor when the current operation working condition of an engine of a vehicle meets a preset condition;
the fault diagnosis module is used for determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift when the first pressure and the second pressure meet a first preset condition;
the fault diagnosis module is further used for determining that the fault of the variable valve lift is that the variable valve lift is blocked at a high lift when the first pressure and the second pressure meet a second preset condition;
the fault diagnosis module is further configured to determine that the variable valve lift is fault-free when the first pressure and the second pressure meet a third preset condition.
In a third aspect, an embodiment of the present invention provides a terminal, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect when executing the computer program.
In a fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.
The embodiment of the invention provides a fault diagnosis method, a fault diagnosis device, a fault diagnosis terminal and a storage medium for variable valve lift, which are characterized in that corresponding pressure is calculated by obtaining the measured value of an air flow meter and the measured value of an intake manifold pressure sensor in an engine assembly, fault diagnosis is carried out through pressure difference, and no new hardware is required to be added.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic illustration of an engine assembly according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for fault diagnosis of variable valve lift provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method of fault diagnosis of variable valve lift provided in another embodiment of the present invention;
FIG. 4(1) is a schematic diagram showing the relationship between the engine load and the first, third and sixth thresholds according to the embodiment of the present invention;
FIG. 4(2) is a schematic diagram of the relationship between the second, fourth and fifth thresholds and the engine load according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fault diagnosis device for variable valve lift provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
To make the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic view of a structure of an engine assembly of a vehicle. As shown in fig. 1, an air flow meter 2 is provided between an air cleaner 1 and a supercharger 3, and the air flow meter 2 is used to measure the flow rate of air entering the engine. After passing through the supercharger 3, the air enters the intercooler 4 and then enters the engine intake manifold. An engine intake manifold is connected to the lower end of the engine body, an intake manifold pressure sensor 5 is arranged in the intake manifold, and the intake manifold pressure sensor is used for measuring the pressure of gas in the cylinder. An engine exhaust manifold is connected to the upper end of the engine body, and a three-way catalyst 6 and a particle trap 7 are sequentially arranged on an exhaust pipeline to filter exhaust gas.
The high valve lift is selected when the engine rotates at a high speed, so that the air inflow of the engine can be increased, and the power output of the engine at the high speed is improved; the engine selects low valve lift at low rotation speed, so that pumping loss of the engine can be reduced to the maximum extent, proper internal Exhaust Gas Recirculation (EGR) is obtained, heat transfer loss is reduced, preparation of mixed Gas is improved, combustion efficiency is improved, and Exhaust emission is reduced. When the target lift and the actual lift of the VVL coincide, the pressure measured by the intake manifold pressure sensor is substantially the same as the pressure calculated by the air flow meter, and when the target lift and the actual lift of the VVL do not coincide, the pressure measured by the intake manifold pressure sensor is different from the pressure calculated by the air flow meter, and at this time, a malfunction may occur.
When the actual lift and the target lift of VVL do not coincide, 4 fault conditions may be included:
the 1 st fault is that the target lift is a low lift, the actual lift is the low lift, and although the actual lift is consistent with the target lift, the VVL has jamming at the low lift;
the 2 nd fault is that the target lift is high lift, the actual lift is low lift, and the VVL is stuck at the low lift;
the 3 rd fault is that the target lift is a low lift, the actual lift is a high lift, and the VVL is stuck at the high lift;
the 4 th fault is that the target lift is high lift and the actual lift is high lift, and although the actual lift and the target are consistent, the VVL lift is stuck at the high lift at the moment.
The following is a method for diagnosing a fault of a variable valve lift according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating an implementation of a fault diagnosis method for variable valve lift according to an embodiment of the present invention, as shown in fig. 1, an air flow meter and an intake manifold pressure sensor are disposed in an engine assembly of a vehicle, and the fault diagnosis method for variable valve lift is described in detail as follows:
Optionally, in this step, the current operating condition of the engine may include: engine water temperature, engine speed, engine load, engine speed gradient, and engine load gradient.
When the parameter value corresponding to the current operation working condition of the engine is within the calibrated threshold value, the current operation working condition of the engine can be determined to meet the preset condition. In the embodiment, the calibrated threshold of the engine operation condition is not limited, and may be set according to actual requirements.
Optionally, in this step, when the current operating condition of the engine of the vehicle meets the preset condition, the measured value of the air flow meter may be obtained, and then the first pressure of the cylinder may be calculated according to the measured value. And acquires a measurement value of the intake manifold pressure sensor, and calculates a second pressure of the cylinder corresponding to the measurement value of the intake manifold pressure sensor.
When the first pressure is the same as the second pressure, the target lift of the VVL coincides with the actual lift, and when the first pressure is different from the second pressure, the target lift of the VVL does not coincide with the actual lift, so that it is possible to diagnose whether the target lift of the VVL coincides with the actual lift based on the first pressure and the second pressure.
And 202, when the first pressure and the second pressure meet a first preset condition, determining that the fault of the variable valve lift is that the variable valve lift is stuck at a low lift.
Optionally, this step may include: calculating an integral value of the absolute value of the difference value when the absolute value of the difference value between the first pressure and the second pressure is greater than the first threshold value, and calculating an integral average value of the absolute value of the difference value from all integral values of the absolute value of the difference value;
and when the integral average value is larger than the second threshold value and the difference value is larger than a third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is stuck at a low lift.
Alternatively, the step of calculating an integral value of the absolute value of the difference when the absolute value of the difference between the first pressure and the second pressure is greater than the first threshold, and calculating the integral average value of the absolute value of the difference from all integral values of the absolute value of the difference may include: when the absolute value of the difference value between the first pressure and the second pressure is larger than a first threshold value, taking multiple sections of integration intervals, and calculating the integral value of the absolute value of the difference value corresponding to each section of integration interval;
and calculating the average value of all the integral values of the absolute values of the differences to obtain the integral average value of the absolute values of the differences.
For example, the number of segments of the integration interval in which the integrated value of the absolute value of the difference is calculated may be three, four, five, or the like, so that the obtained integrated average value is more accurate.
In the present embodiment, the first threshold, the second threshold, and the third threshold are all values that vary with the change in engine load rather than proportionally, and the third threshold is greater than the first threshold and less than the second threshold. The first threshold is a threshold of an absolute value of the difference, and is used for preliminarily judging whether the VVL has a fault or not, and then further calculating an integral average value to further confirm the fault. The absolute value of the difference is smaller than the first threshold, and VVL may be in a normal state or an abnormal state, so that further determination is required. And the absolute value of the difference is greater than the first threshold, VVL must be abnormal, so the determination is made through step 202 and step 203. The first threshold is a value that varies proportionally with the engine load, the X-axis is the engine load, the Y-axis is the first threshold, and the greater the load, the greater the value of the first threshold, as shown in fig. 4 (1).
In the present embodiment, when the target lift of the VVL is a low lift, the integrated average is greater than the second threshold and the difference is greater than the third threshold, the failure of the variable valve lift is the first failure, that is, the target lift coincides with the actual lift, but the variable valve lift is stuck at the low lift.
In this embodiment, when the target lift of the VVL is a high lift, the integrated average is greater than the second threshold, and the difference is greater than the third threshold, the fault of the variable valve lift is a second fault, that is, the target lift is inconsistent with the actual lift, and the variable valve lift is stuck at a low lift.
In this embodiment, the second threshold value is a threshold value of an integrated average value of the absolute values of the difference values, and is used for further judging the fault, and the judgment of the fault by using the integrated value can eliminate the influence of the magnitude change of the absolute values of the difference values on the diagnosis. The second threshold 2 is a value that varies proportionally with the engine load, the X-axis is the engine load, the Y-axis is the second threshold, and the larger the load, the larger the value of the second threshold, as shown in fig. 4 (2).
In this embodiment, the third threshold is a threshold for determining a direction in which the VVL is stuck, and the difference is greater than the third threshold, which indicates that the second pressure is greater than the first pressure, and indicates that the VVL is stuck in the low lift. The third threshold is a value that varies with the engine load rather than proportionally, the X-axis is the engine load, the Y-axis is the third threshold, and the larger the load, the larger the value of the third threshold, as shown in fig. 4 (1).
As can be seen from fig. 4(1) and 4(2), the third threshold is greater than the first threshold and less than the second threshold.
And step 203, when the first pressure and the second pressure meet a second preset condition, determining that the fault of the variable valve lift is that the variable valve lift is blocked at a high lift.
Optionally, this step may include: calculating an integral value of the absolute value of the calculated difference of the absolute values of the differences when the absolute value of the difference between the first pressure and the second pressure is greater than the first threshold value, and calculating an integral average value of the absolute values of the differences based on all the integral values of the absolute values of the differences;
and when the integral average value is larger than the second threshold value and the difference value is smaller than a sixth threshold value, determining that the fault of the variable valve lift is the target lift is the low lift, and the variable valve lift is stuck at the high lift, namely a third fault. The sixth threshold is less than the first threshold.
The sixth threshold is used for judging the locking direction of the VVL, and the difference value is smaller than the sixth threshold, which indicates that the second pressure is smaller than the first pressure and indicates that the VVL is locked in a high lift. As shown in fig. 4, the sixth threshold is a value that varies with the engine load rather than proportionally, the X-axis is the engine load, the Y-axis is the sixth threshold, and the larger the load, the smaller the value of the sixth threshold, as shown in fig. 4 (1). The absolute value of the sixth threshold is approximately equal to the third threshold.
Alternatively, when the absolute value of the difference between the first pressure and the second pressure is greater than the first threshold value, calculating an integrated value of the absolute value of the difference, and calculating an integrated average value of the absolute value of the difference based on all the integrated values of the absolute value of the difference, includes:
when the absolute value of the difference value between the first pressure and the second pressure is larger than a first threshold value, a plurality of sections of integration intervals are taken, and the integral value of the absolute value of the difference value corresponding to each section of integration interval is calculated;
and calculating the average value of all the integral values of the absolute values of the differences to obtain the integral average value of the absolute values of the differences.
And 204, when the first pressure and the second pressure meet a third preset condition, determining that the variable valve lift is fault-free.
Optionally, as shown in fig. 1 or fig. 3, the step may include:
detecting whether an absolute value of a difference between the first pressure and the second pressure is greater than a first threshold;
when the absolute value of the difference value between the first pressure and the second pressure is larger than a first threshold value, skipping to the step of calculating the integral average value of the absolute value of the difference value;
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value of the difference is not greater than a first threshold value;
detecting whether an integral value of the absolute value of the difference is smaller than a fourth threshold;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of a new difference between the third pressure and the fourth pressure;
detecting whether the integral value of the absolute value of the new difference is smaller than a fifth threshold;
when the integrated value of the absolute value of the new difference is smaller than the fifth threshold value, it is determined that the variable valve lift is trouble-free.
And the fourth threshold and the fifth threshold are both larger than the first threshold and smaller than the second threshold.
In this embodiment, the fourth threshold value and the fifth threshold value are threshold values of the integrated value of the absolute value of the difference value, and are used for further judging whether a fault exists, and the judgment of the fault by using the integrated value can eliminate the influence of the change in the magnitude of the absolute value of the difference value on the diagnosis. The fourth threshold and the fifth threshold are both values that vary with engine load rather than proportionally, the X axis is engine load, the Y axis is the fourth threshold or the fifth threshold, and the greater the load, the greater the value of the fourth threshold or the fifth threshold, as shown in fig. 4 (2). The fourth threshold is approximately equal to the fifth threshold.
It should be noted that the magnitude relationship among the third threshold, the fourth threshold, and the fifth threshold needs to be determined in the actual application process.
By actively switching the target lift in the diagnosis process, the fault detection time can be reduced, the fault detection speed can be increased, and the In Use Performance Ratio (IUPR) can be increased. IUPR reflects the magnitude of the diagnostic frequency of a diagnosis, with the minimum IUPR rate currently required for VVT systems being 0.336, and below 0.336 being not.
Optionally, as shown in fig. 3, in the process of determining that the fault of the variable valve lift is that the variable valve lift is stuck in the low lift, the method may further include:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value of the difference is not greater than a first threshold;
when the integral value of the absolute value of the difference is not less than the fourth threshold value, repeatedly calculating the integral value of the absolute value of the difference;
and calculating an integral average value of the absolute values of the difference values according to all integral values of the absolute values of the difference values, and determining that the variable valve lift is stuck at the low lift when the integral average value is greater than a second threshold and the difference value is greater than a third threshold.
In this embodiment, the absolute value of the difference may be integrated in multiple intervals, and then an average value may be calculated for all the integrated values, and the determination may be performed based on the integrated average value.
Alternatively, when the integrated value of the absolute values of the differences is not less than the fourth threshold, the step of repeatedly calculating the integrated value of the absolute values of the differences may include:
and when the integral value of the absolute value of the difference value is not less than the fourth threshold value, taking an integral interval different from the integral interval of the integral value of the absolute value of the difference value calculated for the first time, and calculating the integral value of the absolute value of the difference value corresponding to each integral interval.
As shown in fig. 4(1) and 4(2), the first threshold, the second threshold, the third threshold, and the fourth threshold are all values that vary proportionally with changes in engine load, and the third threshold is greater than the first threshold and less than the second threshold, and the fourth threshold is greater than the first threshold and less than the second threshold.
Optionally, as shown in fig. 3, in the process of determining that the fault of the variable valve lift is that the variable valve lift is stuck in the low lift, the method may further include:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value of the difference is not greater than a first threshold value;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of a new difference between the third pressure and the fourth pressure;
when the integral value of the absolute value of the new difference is not less than the fifth threshold, repeatedly calculating the integral value of the absolute value of the new difference;
calculating an integral average value of the absolute value of the new difference value according to all integral values of the absolute value of the new difference value;
and when the integral average value of the absolute value of the new difference value is greater than the second threshold value and the new difference value is greater than the third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is blocked at a low lift.
Alternatively, when the integrated value of the absolute value of the new difference is not less than the fifth threshold, the step of repeatedly calculating the integrated value of the absolute value of the new difference may include:
and when the integral value of the absolute value of the new difference value is not less than the fifth threshold, taking an integral interval different from the integral interval for calculating the integral value of the absolute value of the new difference value for the first time, and calculating the integral value of the absolute value of the new difference value corresponding to each integral interval.
As shown in fig. 4(1) and 4(2), the first threshold, the second threshold, the third threshold, the fourth threshold, and the fifth threshold are values that vary proportionally with the change in engine load, the fourth threshold and the fifth threshold are both greater than the first threshold and both less than the second threshold, and the third threshold is greater than the first threshold and less than the second threshold.
It should be noted that, in the 4 th failure, the target lift is a high lift, and the actual lift is a high lift, and although the actual lift and the target lift are the same, the VVL lift is already stuck at the high lift. At this time, since the engine requires a large amount of intake air, if the engine is actively switched to the low lift, the engine power is insufficient, so in this case, the diagnosis is not performed, and the failure state is not determined, but is performed when the engine is operated to other 3 failure cases.
According to the fault diagnosis method for the variable valve lift, diagnosis is carried out through the air flow meter and the intake manifold pressure sensor, and new hardware does not need to be added, so that compared with the mode that the valve lift is monitored through the addition of the Hall sensor in the prior art, the method for diagnosing the variable valve lift can reduce cost. According to the invention, the corresponding cylinder pressure is calculated through the air flow meter and the intake manifold pressure sensor, and the fault diagnosis is carried out through the integral value of the cylinder pressure difference, so that the reliability is higher. When there is a fault in the VVL, the determination can be made quickly by only one diagnosis, and when there is a fault in the VVL, the determination can be made by three diagnoses, so that the fault can be determined more accurately. In addition, the invention actively switches the target lift in the diagnosis process, can improve the speed of detecting faults and simultaneously improves the IUPR rate.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 5 is a schematic structural diagram of a variable valve lift failure diagnosis device provided in an embodiment of the present invention, in which an air flow meter and an intake manifold pressure sensor are disposed in an engine assembly of a vehicle, and for convenience of description, only parts related to the embodiment of the present invention are shown, and details are as follows:
as shown in fig. 5, the variable valve lift failure diagnosis device 5 includes: an acquisition module 501 and a fault diagnosis module 502.
The acquiring module 501 is configured to acquire a first pressure of an air cylinder corresponding to a measurement value of an air flow meter and a second pressure of an air cylinder corresponding to a measurement value of an intake manifold pressure sensor when a current operating condition of an engine of a vehicle meets a preset condition;
the fault diagnosis module 502 is used for determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift when the first pressure and the second pressure meet a first preset condition;
the fault diagnosis module 502 is further configured to determine that the fault of the variable valve lift is that the variable valve lift is stuck at a high lift when the first pressure and the second pressure meet a second preset condition;
the fault diagnosis module 502 is further configured to determine that the variable valve lift is fault-free when the first pressure and the second pressure satisfy a third preset condition.
Optionally, when the first pressure and the second pressure satisfy the first preset condition, the fault diagnosis module 502 determines that the fault of the variable valve lift is that the variable valve lift is stuck at a low lift, and is configured to:
calculating an integral value of the absolute value of the difference when the absolute value of the difference between the first pressure and the second pressure is greater than a first threshold value, and calculating an integral average value of the absolute value of the difference based on all the integral values of the absolute value of the difference;
when the integral average value is larger than a second threshold value and the difference value is larger than a third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
the first threshold, the second threshold, and the third threshold are all values that vary with engine load rather than proportionally, and the third threshold is greater than the first threshold and less than the second threshold.
Alternatively, when the first pressure and the second pressure satisfy a second predetermined condition, the fault diagnosis module 502 determines that the fault in the variable valve lift is that the variable valve lift is stuck at a high lift for:
calculating an integral value of the absolute value of the difference value when the absolute value of the difference value between the first pressure and the second pressure is greater than the first threshold value, and calculating an integral average value of the absolute value of the difference value from all integral values of the absolute value of the difference value;
when the integral average value is larger than a second threshold value and the difference value is smaller than a sixth threshold value, determining that the fault of the variable valve lift is a target lift which is a low lift, and the variable valve lift is blocked at a high lift;
the first, second, and sixth thresholds are all values that vary with engine load rather than proportionally, and the sixth threshold is less than the first threshold.
Alternatively, when the first pressure and the second pressure satisfy the third preset condition, and the fault diagnosis module 502 determines that the variable valve lift is fault-free, it may be configured to:
when the absolute value of the difference value between the first pressure and the second pressure is larger than a first threshold value, skipping to the step of calculating the integral average value of the absolute value of the difference value;
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value of the difference is not greater than a first threshold;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of a new difference between the third pressure and the fourth pressure;
when the integral value of the absolute value of the new difference value is smaller than a fifth threshold value, determining that the variable valve lift is fault-free;
the first, fourth, and fifth thresholds are values that vary with engine load rather than proportionally, and are each greater than the first threshold.
A fault diagnosis module 502, further configured to calculate an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value is not greater than a first threshold;
determining that the variable valve lift is fault-free when the integral value of the absolute value of the new difference is smaller than a fifth threshold value;
the fourth threshold and the fifth threshold are both greater than the first threshold and both less than the second threshold.
Optionally, the fault diagnosis module 502 is further configured to: repeatedly calculating the integral value of the absolute value of the difference value when the integral value of the absolute value of the difference value is not less than the fourth threshold value; calculating an integral average value of the absolute values of the difference values according to all integral values of the absolute values of the difference values, and determining that the fault of the variable valve lift is that the variable valve lift is stuck at a low lift when the integral average value is greater than a second threshold and the difference value is greater than a third threshold;
the first threshold value, the second threshold value, the third threshold value and the fourth threshold value are all values that vary proportionally with changes in engine load, and the third threshold value is greater than the first threshold value and less than the second threshold value, and the fourth threshold value is greater than the first threshold value and less than the second threshold value.
Optionally, the fault diagnosis module 502 is further configured to: calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value of the difference is not greater than a first threshold value;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of a new difference between the third pressure and the fourth pressure;
repeatedly calculating the integral value of the absolute value of the new difference value when the integral value of the absolute value of the new difference value is not less than the fifth threshold value;
calculating an integral average value of the absolute value of the new difference value according to all integral values of the absolute value of the new difference value;
when the integral average value of the absolute value of the new difference value is larger than a second threshold value and the new difference value is larger than a third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
the first threshold, the second threshold, the third threshold, the fourth threshold and the fifth threshold are values which change in proportion to the change of the engine load, the fourth threshold and the fifth threshold are both larger than the first threshold and smaller than the second threshold, and the third threshold is larger than the first threshold and smaller than the second threshold.
Alternatively, the fault diagnosis module 502 calculates an integral value of the absolute value of the difference when the absolute value of the difference between the first pressure and the second pressure is greater than the first threshold, and calculates an integral average value of the absolute value of the difference based on all integral values of the absolute value of the difference, for:
when the absolute value of the difference value between the first pressure and the second pressure is larger than a first threshold value, taking multiple sections of integration intervals, and calculating the integral value of the absolute value of the difference value corresponding to each section of integration interval;
and calculating the average value of all the integral values of the absolute values of the differences to obtain the integral average value of the absolute values of the differences.
The fault diagnosis device for the variable valve lift diagnoses through the air flow meter and the pressure sensor of the intake manifold without adding new hardware, so compared with the mode of monitoring the valve lift through adding the Hall sensor in the prior art, the fault diagnosis device for the variable valve lift can reduce the cost. According to the invention, through the air flow meter and the intake manifold pressure sensor, the fault diagnosis module carries out fault diagnosis according to the integral value of the corresponding cylinder pressure difference, and the reliability is higher. When the VVL has no fault, the fault can be quickly determined only by one-time diagnosis, and when the VVL has the fault, the fault can be determined by three-time diagnosis, so that the fault can be more accurately determined. In addition, the invention actively switches the target lift in the diagnosis process, can improve the speed of detecting faults and simultaneously improves the IUPR rate.
Fig. 6 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in fig. 6, the terminal 6 of this embodiment includes: a processor 60, a memory 61, and a computer program 62 stored in the memory 61 and executable on the processor 60. The processor 60 implements the steps in the above-described respective variable valve lift failure diagnosis method embodiments, such as steps 101 to 103 shown in fig. 1, when executing the computer program 62. Alternatively, the processor 60, when executing the computer program 62, implements the functions of the various modules/units in the above-described apparatus embodiments, such as the functions of the modules/units 401 to 403 shown in fig. 4.
Illustratively, the computer program 62 may be divided into one or more modules/units, which are stored in the memory 61 and executed by the processor 60 to carry out the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 62 in the terminal 6. For example, the computer program 62 may be divided into modules/units 401 to 403 shown in fig. 4.
The terminal 6 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal 6 may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that fig. 6 is only an example of a terminal 6 and does not constitute a limitation of the terminal 6, and that it may comprise more or less components than those shown, or some components may be combined, or different components, for example the terminal may further comprise input output devices, network access devices, buses, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the terminal 6, such as a hard disk or a memory of the terminal 6. The memory 61 may also be an external storage device of the terminal 6, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the terminal 6. The memory 61 is used for storing the computer programs and other programs and data required by the terminal. The memory 61 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application. For the specific working processes of the units and modules in the system, reference may be made to the corresponding processes in the foregoing method embodiments, which are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one type of logical function division, and other division manners may exist in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated module/unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the method for diagnosing a fault of variable valve lift may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier signal, telecommunications signal, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (10)
1. A method of diagnosing a failure of a variable valve lift in an engine assembly of a vehicle provided with an air flow meter and an intake manifold pressure sensor, characterized by comprising:
when the current operation working condition of an engine of a vehicle meets a preset condition, acquiring a first pressure of an air cylinder corresponding to a measured value of the air flow meter and a second pressure of the air cylinder corresponding to a measured value of the intake manifold pressure sensor;
when the first pressure and the second pressure meet a first preset condition, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
when the first pressure and the second pressure meet a second preset condition, determining that the fault of the variable valve lift is that the variable valve lift is blocked at a high lift;
determining that the variable valve lift is fault-free when the first pressure and the second pressure satisfy a third preset condition.
2. The method for diagnosing the fault of the variable valve lift according to claim 1, wherein the determining that the fault of the variable valve lift is stuck at a low lift when the first pressure and the second pressure satisfy a first preset condition comprises:
calculating an integral value of the absolute value of the difference value when the absolute value of the difference value between the first pressure and the second pressure is greater than a first threshold value, and calculating an integral average value of the absolute value of the difference value from all the integral values of the absolute value of the difference value;
when the integral average value is larger than a second threshold value and the difference value is larger than a third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
the first, second and third thresholds are all values that vary proportionally with changes in engine load, and the third threshold is greater than the first threshold and less than the second threshold.
3. The method of diagnosing a malfunction of a variable valve lift according to claim 1, wherein determining that the malfunction of the variable valve lift is that the variable valve lift is stuck at a high lift when the first pressure and the second pressure satisfy a second preset condition includes:
calculating an integral value of the absolute value of the difference value when the absolute value of the difference value between the first pressure and the second pressure is greater than a first threshold value, and calculating an integral average value of the absolute value of the difference value from all the integral values of the absolute value of the difference value;
when the integral average value is larger than a second threshold value and the difference value is smaller than a sixth threshold value, determining that the fault of the variable valve lift is that the target lift is a low lift and the variable valve lift is blocked at a high lift;
the first threshold, the second threshold, and the sixth threshold are all values that vary proportionally with changes in engine load, and the sixth threshold is less than the first threshold.
4. The method of diagnosing a malfunction of a variable valve lift according to claim 1, wherein the determining that the variable valve lift is not malfunctioning when the first pressure and the second pressure satisfy a third preset condition includes:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value is not greater than a first threshold;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of a new difference between the third pressure and the fourth pressure;
determining that the variable valve lift is fault-free when the integral value of the absolute value of the new difference is less than a fifth threshold value;
the first, fourth, and fifth thresholds are values that vary with engine load rather than proportionally, and are each greater than the first threshold.
5. The method for diagnosing the fault of the variable valve lift according to claim 1, wherein the determining that the fault of the variable valve lift is stuck at a low lift when the first pressure and the second pressure satisfy a first preset condition comprises:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value is not greater than a first threshold;
repeatedly calculating an integrated value of the absolute value of the difference value when the integrated value of the absolute value of the difference value is not less than a fourth threshold value;
calculating an integral average value of the absolute values of the difference values according to all integral values of the absolute values of the difference values, and determining that the fault of the variable valve lift is that the variable valve lift is stuck at a low lift when the integral average value is larger than a second threshold and the difference value is larger than a third threshold;
the first, second, third and fourth thresholds are all values that vary proportionally with changes in engine load, and the third threshold is greater than the first threshold and less than the second threshold.
6. The method for diagnosing a malfunction of a variable valve lift according to claim 1, wherein the determining that the malfunction of the variable valve lift is variable valve lift stuck at a low lift when the first pressure and the second pressure satisfy a first preset condition includes:
calculating an integral value of an absolute value of a difference between the first pressure and the second pressure when the absolute value of the difference is not greater than a first threshold;
when the integral value of the absolute value of the difference is smaller than a fourth threshold value, switching the current target lift to a high lift, and acquiring a third pressure of the cylinder corresponding to the measurement value of the current air flow meter and a fourth pressure of the cylinder corresponding to the measurement value of the current intake manifold pressure sensor again, and calculating the integral value of the absolute value of the new difference between the third pressure and the fourth pressure;
repeatedly calculating the integral value of the absolute value of the new difference when the integral value of the absolute value of the new difference is not less than a fifth threshold;
calculating an integral average value of the absolute value of the new difference value according to all integral values of the absolute value of the new difference value;
when the integral average value of the absolute value of the new difference value is larger than a second threshold value and the new difference value is larger than a third threshold value, determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift;
the first threshold, the second threshold, the third threshold, the fourth threshold and the fifth threshold are all values that vary non-proportionally with changes in engine load, and the fourth threshold and the fifth threshold are both greater than the first threshold and both less than the second threshold, and the third threshold is greater than the first threshold and less than the second threshold.
7. The fault diagnosis method of the variable valve lift according to claim 2 or 3, wherein the calculating an integrated value of the absolute value of the difference between the first pressure and the second pressure when the absolute value is greater than a first threshold value and calculating an integrated average value of the absolute value of the difference from all the integrated values of the absolute value of the difference comprises:
when the absolute value of the difference value between the first pressure and the second pressure is larger than a first threshold value, a plurality of sections of integration intervals are taken, and the integral value of the absolute value of the difference value corresponding to each section of integration interval is calculated;
and calculating the average value of all the integral values of the absolute values of the differences to obtain the integral average value of the absolute values of the differences.
8. A variable valve lift malfunction diagnosis apparatus provided with an air flow meter and an intake manifold pressure sensor in an engine assembly of a vehicle, characterized by comprising:
the acquisition module is used for acquiring first pressure of a cylinder corresponding to a measured value of the air flow meter and second pressure of the cylinder corresponding to a measured value of the intake manifold pressure sensor when the current operation working condition of an engine of a vehicle meets a preset condition;
the fault diagnosis module is used for determining that the fault of the variable valve lift is that the variable valve lift is clamped at a low lift when the first pressure and the second pressure meet a first preset condition;
the fault diagnosis module is further used for determining that the fault of the variable valve lift is that the variable valve lift is blocked at a high lift when the first pressure and the second pressure meet a second preset condition;
the fault diagnosis module is further configured to determine that the variable valve lift is fault-free when the first pressure and the second pressure meet a third preset condition.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| US7047924B1 (en) * | 2005-08-19 | 2006-05-23 | Delphi Technologies, Inc. | Method for diagnosing the operational state of a two-step variable valve lift device |
| KR20100011759A (en) * | 2008-07-25 | 2010-02-03 | 현대자동차주식회사 | Trouble detecting method and apparatus of variable valve lift device |
| CN102635453A (en) * | 2011-02-10 | 2012-08-15 | 通用汽车环球科技运作有限责任公司 | Variable valve lift mechanism fault detection systems and methods |
| CN105673238A (en) * | 2016-01-13 | 2016-06-15 | 奇瑞汽车股份有限公司 | Diagnostic method of engine variable intake manifold execution mechanism |
| CN106150728A (en) * | 2015-03-31 | 2016-11-23 | 长城汽车股份有限公司 | The fault detect of continuous variable valve lift mechanism and processing method |
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2021
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|---|---|---|---|---|
| US7047924B1 (en) * | 2005-08-19 | 2006-05-23 | Delphi Technologies, Inc. | Method for diagnosing the operational state of a two-step variable valve lift device |
| KR20100011759A (en) * | 2008-07-25 | 2010-02-03 | 현대자동차주식회사 | Trouble detecting method and apparatus of variable valve lift device |
| CN102635453A (en) * | 2011-02-10 | 2012-08-15 | 通用汽车环球科技运作有限责任公司 | Variable valve lift mechanism fault detection systems and methods |
| CN106150728A (en) * | 2015-03-31 | 2016-11-23 | 长城汽车股份有限公司 | The fault detect of continuous variable valve lift mechanism and processing method |
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