CN116428070A - Variable valve timing mechanism fault abnormality processing method, system and vehicle - Google Patents
Variable valve timing mechanism fault abnormality processing method, system and vehicle Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/26—Control of the engine output torque by applying a torque limit
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention provides a variable valve timing mechanism fault abnormality processing method, a storage medium, a variable valve timing mechanism fault processing system and a vehicle. The processing method of the invention comprises the following steps: acquiring a signal associated with a driving action of an intake valve of a variable valve timing mechanism; judging whether the air inlet valve is in a stagnation state which can not normally act according to the change condition of the signal; when the intake valve is in a stagnation state, a preset torque limiting protection program is executed to limit the actual output torque of the engine. The method for processing the fault abnormality of the variable valve timing mechanism can timely control the actual output torque of the engine when judging that the air inlet valve is in an abnormal stagnation state, limit the actual output torque within a smaller limit value range, prevent the condition of overhigh exhaust temperature caused by overlarge air inlet and outlet quantity of the engine, and is beneficial to reducing the risk of burning a supercharger or a catalyst caused by the fault abnormality of the variable valve timing mechanism.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to a method for processing fault anomalies of a variable valve timing mechanism. In addition, the invention also relates to a variable valve timing mechanism fault processing system based on the processing method and a vehicle provided with the processing system.
Background
The VVT (Variable Valve Timing ) system is a main component of engine control, and adjusts the phase of an engine cam so that the opening and closing times of an intake valve and an exhaust valve are changed with the change of the engine speed, thereby improving the charging efficiency and increasing the engine power.
If an abnormality occurs in the variable valve timing mechanism (i.e., the VVT mechanism), there is a possibility that the calculation of the charge may be inaccurate, and thus an abnormality in the mixture may occur. Therefore, the OBD (On-Board Diagnostics, on-board automatic diagnostic system) should monitor the response rate of the VVT mechanism, and if the actual opening of the intake valve cannot follow the target opening, a corresponding response failure signal should be reported.
However, if the VVT mechanism is stuck, when the intake valve is stuck at a position with a larger opening, or when the control line of the VVT control valve is shorted to ground, the intake valve of the VVT mechanism is always at a fully opened position, which inevitably results in excessive intake or exhaust flow of the engine, and excessive exhaust temperature of the engine, thereby causing a risk of burning out the supercharger or the catalyst.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for handling a failure abnormality of a variable valve timing mechanism, which reduces the risk of burning a supercharger or a catalyst due to an excessive engine exhaust gas temperature caused by the failure abnormality of the variable valve timing mechanism.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method of processing a variable valve timing mechanism failure abnormality, the method comprising: acquiring a signal associated with a driving action of an intake valve of a variable valve timing mechanism; judging whether the air inlet valve is in a stagnation state which can not normally act according to the change condition of the signal; and when the intake valve is in the stagnation state, executing a preset torque limiting protection program to limit the actual output torque of the engine.
Further, the signals include at least one of a first signal for determining that the variable valve timing mechanism is stuck or retarded, and a second signal for determining that the variable valve timing mechanism line is short/open.
Further, the first signal is obtained through an encoder of a driving motor of the intake valve; and/or the second signal is an electrical signal acquired by detecting a line of the variable valve timing mechanism.
Further, the torque limiting protection program includes: a corresponding engine torque limit is calculated based on the current engine speed and the actual output torque is limited below the engine torque limit.
Further, the torque limiting protection program further includes: calculating a corresponding control expected output torque value based on the current accelerator pedal opening; and controlling the actual output torque by adjusting the air inflow and the fuel injection quantity of the engine by taking the smaller value of the engine torque limit value and the manipulation expected output torque value as a torque output target value.
Further, the calculating the corresponding engine torque limit based on the current engine speed includes: selecting a plurality of sample values in the variation range of the engine speed, and measuring and calculating the engine torque limit value corresponding to each sample value; obtaining a change curve of the engine torque limit value relative to the engine speed by adopting an interpolation calculation method; and calculating the current engine torque limit value corresponding to the engine speed through the change curve.
Further, each sample value is selected within a variation range of the engine speed above a preset minimum speed.
Further, each sample value is selected with the same rotational speed difference value within the variation range of the engine rotational speed.
Compared with the prior art, the invention has the following advantages:
the method for processing the fault exception of the variable valve timing mechanism can timely acquire signals related to the driving action of an intake valve of the variable valve timing mechanism by monitoring; when the intake valve is judged to be in an abnormal stagnation state, the actual output torque of the engine can be controlled in time, and the actual output torque is limited in a smaller limit value range, so that the condition of overhigh exhaust temperature caused by overlarge intake and exhaust gas quantity of the engine is prevented, and the risk of burning a supercharger or a catalyst caused by abnormal faults of the variable valve timing mechanism is reduced.
In addition, in the fault abnormal condition of the variable valve timing mechanism, the blocking of the variable valve timing mechanism, the slow action of the variable valve timing mechanism and the short/open circuit of the variable valve timing mechanism line can cause the stagnation of the intake valve at the opening position, one or more of the blocking and open circuit can be selected as a fault monitoring object, so that the fault abnormal information of the variable valve timing mechanism which needs to be concerned can be accurately and timely obtained, and further a reliable signal is provided for controlling the actual output torque of the engine.
In addition, the change curve data of the engine torque limit value relative to the engine speed is obtained in advance by adopting an interpolation calculation mode, the corresponding engine torque limit value can be timely determined along with the real-time change of the engine speed, and the quick comparison and selection are facilitated to determine the torque output target value, so that the quick and accurate implementation of the processing method is ensured.
Another object of the present invention is to provide a variable valve timing mechanism failure processing system including: an acquisition unit configured to acquire a signal associated with a driving action of an intake valve of a variable valve timing mechanism; and the control unit is connected with the acquisition unit and the engine, judges whether the air inlet valve is in a stagnation state which can not normally act according to the change condition of the signal, and executes a preset torque limiting protection program when the air inlet valve is in the stagnation state so as to limit the actual output torque of the engine.
The variable valve timing mechanism fault processing system provided by the invention can timely acquire signals related to the driving action of the intake valve of the variable valve timing mechanism through the configuration of the acquisition unit and the control unit, and send the signals to the control unit, and the control unit judges whether the intake valve is in an abnormal stagnation state or not so as to further realize the control of the actual output torque of the engine, thereby completing the implementation of a torque limiting protection program and reducing the risk of burning a supercharger or a catalyst caused by the fault abnormality of the variable valve timing mechanism.
The invention also provides a vehicle, and the engine control device of the vehicle is provided with the variable valve timing mechanism fault processing system. The vehicle of the present invention has the technical advantages of the variable valve timing mechanism failure processing system described above.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention, wherein the words of front and back, top and bottom, etc. are used to indicate relative position and are not intended to limit the invention unduly. In the drawings:
FIG. 1 is a flowchart illustrating a method for handling a failure abnormality of a variable valve timing mechanism according to an embodiment of the present invention;
FIG. 2 is a graph of engine torque limit versus engine speed for an embodiment of the present disclosure;
fig. 3 is a schematic diagram showing a system configuration of a variable valve timing mechanism failure processing system according to a second embodiment of the present invention.
Reference numerals illustrate:
3. an engine; 5. an acquisition unit; 51. an encoder; 52. a line resistance detecting element; 53. an accelerator pedal opening detecting element;
6. a control unit; 61. a control module; 62. and a storage module.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly, unless otherwise specifically defined. For example, the connection may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in combination with specific cases.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
The present embodiment relates to a method of processing a variable valve timing mechanism failure abnormality, which can reduce the risk of burning a supercharger or a catalyst, which is caused by an excessive temperature of the exhaust gas of an engine 3 due to the variable valve timing mechanism failure abnormality; an exemplary process flow is shown in fig. 1.
Overall, the processing method mainly comprises: acquiring a signal associated with a driving action of an intake valve of a variable valve timing mechanism; judging whether the air inlet valve is in a stagnation state which can not normally act according to the change condition of the signal; when the intake valve is in the stagnation state, a preset torque limiting protection routine is executed to limit the actual output torque of the engine 3.
Specifically, as shown in connection with fig. 1, it can be subdivided into the following steps:
s1, monitoring and acquiring signals related to driving actions of an intake valve of a variable valve timing mechanism; the method mainly comprises abnormal changes of related signals caused by faults such as clamping stagnation of a variable valve timing mechanism, slow action of the variable valve timing mechanism or short/open circuit of a variable valve timing mechanism line.
S2, judging whether the air inlet valve is in a stagnation state in which normal action cannot be performed according to the change condition of the signals; the subsequent step S3.1 is performed when the intake valve is in an abnormally stagnant state, and the subsequent step S3.2 is performed when the intake valve is in a normal state.
S3.1, adopting a torque limiting protection measure for limiting the actual output torque of the engine to the engine 3, namely executing a torque limiting protection program, and determining an engine torque limit value corresponding to the current engine speed; after which a subsequent step S4 is performed.
S3.2, not adopting a torque limiting protection program, and controlling the actual output torque of the engine by taking a control expected output torque value determined by the opening degree of an accelerator pedal as a torque output target value; and performs the subsequent step S6.
S4, judging whether the abnormal stagnation state of the air inlet valve is eliminated, namely whether the fault is repaired; if the abnormal state is eliminated, step S3.2 is executed, and if the abnormal state is not eliminated, the following step S5 is executed.
S5, comparing the engine torque limit value with a control expected output torque value determined by the opening of the accelerator pedal, and selecting the smaller value of the engine torque limit value and the control expected output torque value as a torque output target value so as to control the actual output torque of the engine; and performs the subsequent step S6.
S6, controlling the engine 3 to adjust the actual output torque of the engine with the target torque output value as a target.
In the case of an abnormality of the conventional engine, there are various cases of failure that causes the intake valve of the variable valve timing mechanism to stagnate in the open position, and this is mainly summarized as the variable valve timing mechanism sticking, the variable valve timing mechanism operation retardation, and the occurrence of short/open of the variable valve timing mechanism line. Based on this, in step S1, the present embodiment selects any one or more of the variable valve timing mechanism sticking, the variable valve timing mechanism operation retardation, and the occurrence of short/open of the variable valve timing mechanism line as the monitoring object to form effective monitoring of the variable valve timing mechanism failure abnormality that may cause the intake valve abnormality to stagnate.
In the fault abnormal condition of the variable valve timing mechanism, the blocking of the variable valve timing mechanism, the slow action of the variable valve timing mechanism and the short/open circuit of the variable valve timing mechanism line can cause the stagnation of the intake valve at the opening position, one or more of the blocking and open circuit can be selected as a fault monitoring object, the fault abnormal information of the variable valve timing mechanism which needs to be concerned can be accurately and timely obtained, and further a reliable basis is provided for the control of the actual output torque of the engine.
Based on the above-described settings, there are many fault monitoring forms of the variable valve timing mechanism sticking, the variable valve timing mechanism retarded operation, and the occurrence of short/open of the variable valve timing mechanism line. Therefore, the above-mentioned signals include a first signal for judging the stuck or retarded movement of the variable valve timing mechanism and a second signal for judging the short/open circuit of the variable valve timing mechanism, one of the first signal and the second signal is selected, preferably both of them, and the occurrence of a change abnormality in either of the signals indicates that the intake valve is in an abnormally stopped state.
In this embodiment, the first signal is acquired by an encoder of a driving motor of the intake valve. The second signal is obtained by detecting an electric signal of a line of the variable valve timing mechanism. By detecting the encoder signal on the driving motor of the intake valve, the running state and the rotating speed of the driving motor can be timely obtained according to the change condition of the encoder signal, so that the clamping stagnation of the variable valve timing mechanism and the fault state of slow action of the variable valve timing mechanism can be accurately judged; by measuring the resistance value, the voltage and the like on the control line of the variable valve timing mechanism in real time, whether the line is short-circuited or not can be timely judged. The encoder, the resistance value and the voltage detection element are adopted, so that the real-time monitoring of the clamping stagnation of the variable valve timing mechanism, the action delay of the variable valve timing mechanism and the short/open circuit of the variable valve timing mechanism circuit can be well realized, and the device has the characteristics of reliable monitoring performance and convenient technical realization.
As mentioned in steps S3.1 and S3.2, the torque limiting protection procedure of the present embodiment includes: a corresponding engine torque limit is calculated based on the current engine speed and the actual engine output torque is limited to below the engine torque limit. Meanwhile, the torque limiting protection program further comprises: calculating a corresponding control expected output torque value based on the current accelerator pedal opening; the actual output torque of the engine is controlled by adjusting the intake air amount and the injection amount of the engine 3 with the smaller value of the engine torque limit value and the manipulation-intended output torque value as the torque output target value as the target of the torque output target value.
At a certain engine speed, the actual output torque of the engine has a significant effect on the exhaust temperature of the engine 3; based on the test condition of the engine 3 and the existing performance data of the engine 3, corresponding engine torque limit values at different engine speeds can be calculated and determined; when the actual output torque of the engine is limited below the engine torque limit value corresponding to the current engine speed, the exhaust temperature of the engine 3 can be ensured not to be too high to burn out the supercharger or the catalyst, so that the coping of the fault abnormal condition of the variable valve timing mechanism is realized by a concise and reliable torque limiting protection program, and the method has the advantages of high efficiency, reliability and convenience in technical realization.
The actual output torque of the engine will respond to the stepping force of the driver on the accelerator pedal, i.e. the control unit 6 of the engine will calculate the control expected output torque value according to the opening degree of the accelerator pedal, and when no abnormal stagnation state of the intake valve occurs, the engine 3 should control the actual output torque of the engine with the control expected output torque value as the target. When abnormal stagnation occurs, but the manipulation-expected output torque value is below the engine torque limit value, the actual output torque of the engine should be adjusted to the manipulation-expected output torque value according to the manipulation request of the driver, so that the risk of burning the supercharger or the catalyst due to the excessively high exhaust temperature of the engine 3 is not generated. Therefore, under the condition, the smaller value of the engine torque limit value and the control expected output torque value is taken as the target torque output target value to control the actual output torque of the engine, so that the control requirement of the vehicle is more favorably met, and the driving requirement of a driver is better met on the premise that the supercharger or the catalyst is not burnt.
There are of course various ways to determine the engine torque limit corresponding to the engine speed, and preferably, the present embodiment employs an interpolation calculation method. Specifically, firstly, selecting a plurality of sample values in the variation range of the engine speed; determining an engine torque limit value corresponding to each sample value in a theoretical calculation or test mode; then, obtaining a change curve of the engine torque limit value relative to the engine speed by adopting an interpolation calculation method; and calculating the engine torque limit value corresponding to the current engine speed according to the numerical corresponding relation determined by the change curve. An exemplary engine torque limit versus engine speed variation determined using the method described above is shown in FIG. 2.
For the engine torque limit value corresponding to each sample value, the engine torque limit value can be determined according to the test condition of the engine 3 or according to the calculation of the existing engine 3 performance data; for example, a test mode may be adopted, the engine is operated under the condition of a selected sample value of the engine speed, the exhaust temperature of the engine 3 is measured, the actual output torque of the engine is gradually reduced, and when the exhaust temperature reaches a lower temperature value which is not likely to burn the supercharger or the catalyst, the current actual output torque is taken as the engine torque limit value corresponding to the sample value. The change curve data of the engine torque limit value relative to the engine speed is obtained in advance by adopting an interpolation calculation mode, the corresponding engine torque limit value can be timely determined along with the real-time change of the engine speed, and the quick comparison and selection are facilitated to determine the torque output target value, so that the quick and accurate implementation of the processing method is ensured.
It should be noted that at lower engine speeds, the exhaust gas temperature of the engine 3 is kept within a low range without adversely affecting the supercharger or catalyst, and therefore, each sample value may be selected within a range of variation of the engine speed above a preset minimum speed to reduce the test and calculation effort. In this embodiment, the preset minimum rotation speed may be set to 2000r/min.
And in the range from the preset minimum rotating speed to the maximum rotating speed of the engine, preferably, the same rotating speed difference value is used as an interval, and each sample value is selected, so that the generation efficiency of the change curve data is improved. In this embodiment, as shown in FIG. 2, the rotational speed difference is set to 1000r/min, and each sample value is sequentially selected from 2000r/min, 3000r/min, 4000r/min, 5000r/min, etc.
In summary, in the method for processing a malfunction abnormality of a variable valve timing mechanism according to the present embodiment, by monitoring a malfunction situation that causes the intake valve to stop at the open position by real-time monitoring, a signal associated with the driving action of the intake valve of the variable valve timing mechanism can be acquired in time; when the intake valve is judged to be in an abnormal stagnation state, the actual output torque of the engine can be controlled in time, and the actual output torque is limited in a smaller limit value range, so that the condition that the exhaust temperature is too high due to the overlarge intake and exhaust quantity of the engine 3 is prevented, and particularly when the intake valve is in a larger-opening angle position, the risk of burning out a supercharger or a catalyst due to the abnormality of a variable valve timing mechanism can be reduced.
Example two
The present embodiment relates to a variable valve timing mechanism failure processing system, which can well implement the coping strategy of the variable valve timing mechanism failure abnormality processing method provided in the first embodiment, so as to reduce the risk of burning a supercharger or a catalyst caused by the variable valve timing mechanism failure abnormality.
An exemplary system configuration of the variable valve timing mechanism failure processing system is shown in fig. 3, which mainly includes:
an acquisition unit 5 for monitoring a failure that causes the intake valve of the variable valve timing mechanism to stagnate in the open position, and issuing a corresponding abnormality signal. And a control unit 6 that connects the acquisition unit 5 and the engine 3, and that, when an abnormality signal is received, performs a torque limiting protection routine for limiting the actual output torque of the engine on the engine 3.
Specifically, the acquisition unit 5 of the present embodiment includes an encoder 51 provided on the engine 3, an electric signal detection element connected to a line of the variable valve timing mechanism, and an accelerator pedal opening detection element 53. The encoder 51 is used for monitoring a stuck state of the variable valve timing mechanism or a failure of the variable valve timing mechanism due to a slow motion, and the accelerator pedal opening detection element 53 is used for monitoring an accelerator pedal opening. The electric signal detecting element is used for detecting the signal conditions such as the resistance value, the voltage and the like on a control circuit for measuring the variable valve timing mechanism in real time, and preferably detects the resistance value of the circuit, and is realized by adopting the circuit resistance value detecting element 52. As already mentioned in the first embodiment, the encoder and the electric signal detection mode can well meet the monitoring requirement of the variable valve timing mechanism fault processing system on the abnormal signal of the variable valve timing mechanism fault.
Further, as shown in fig. 3, the control unit 6 of the present embodiment includes a control module 61 and a storage module 62. The storage module 62 stores therein data corresponding to the engine torque limit and the engine speed, and data corresponding to the manipulation-intended output torque value and the accelerator pedal opening. The control module 61 is capable of extracting a corresponding engine torque limit value and a manipulation-intended output torque value from the storage module 62 based on the current engine speed and accelerator pedal opening, and selecting the smaller of the engine torque limit value and the manipulation-intended output torque value as the torque output target value. When the control module 61 determines that the intake valve is in the stagnation state, it can control the actual output torque of the engine with the torque output target value as a target, so that the actual output torque of the engine continuously approaches the torque output target value, and the purpose of limiting the output torque is achieved.
A control module 61 and a storage module 62 are provided in the control unit 6, and corresponding data of an engine torque limit value and an engine speed, and a manipulation expected output torque value and an accelerator pedal opening can be stored in the storage module 62 in advance; the control module 61 is used for completing the extraction and comparison of the corresponding engine torque limit value and the control expected output torque value, the acceptance of signals and the judgment of abnormal stagnation states, and regulating and controlling the actual output torque of the engine; the coping strategy of the variable valve timing mechanism failure abnormality processing method provided by the first embodiment can be well implemented.
In summary, in the variable valve timing mechanism failure processing system of the present embodiment, by configuring the acquisition unit 5 and the control unit 6, it is possible to acquire a relevant signal of failure abnormality of the variable valve timing mechanism in time, and send the abnormality signal to the control unit 6, and control the actual output torque of the engine by the control unit 6, thereby completing implementation of the torque limiting protection program, so as to prevent the condition that the exhaust temperature of the engine 3 is too high due to the failure abnormality of the variable valve timing mechanism, and reduce the risk of burning the supercharger or the catalyst.
Example III
The present embodiment relates to a vehicle in which the variable valve timing mechanism failure processing system provided in the second embodiment is provided in an engine control device of the vehicle. Preferably, the variable valve timing mechanism fault handling system can adopt the variable valve timing mechanism fault abnormality handling method provided in the first embodiment to well cope with the fault abnormality of the variable valve timing mechanism, thereby achieving the purpose of reducing the risk of burning out the supercharger or the catalyst.
In practical use, a computer-readable storage medium storing a program or instructions that when executed on a computer performs the method of handling a variable valve timing mechanism failure abnormality as in the first embodiment may be provided in the engine control apparatus.
In this embodiment, an exemplary application in which a memory is used as the storage medium is described as an example. The readable storage medium includes both permanent and non-permanent, removable and non-removable media, and the storage of data information including a method of handling variable valve timing mechanism failure anomalies in memory may be accomplished by any method or technique known in the art.
The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer-readable storage media include, but are not limited to, phase-change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory, or other memory technology, read only optical disk read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium which can be used to store information that can be accessed by a computing device.
The memory is integrated in a computer or in an engine control device, such as an engine controller, wherein the processor may be a microprocessor or a digital signal processor, for example, and the memory may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, or the like. The program and data of the processing method of the variable valve timing mechanism failure abnormality of the present embodiment are stored in the memory, and the computer or the engine control device can complete the control operation required for the processing method.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A method of processing a variable valve timing mechanism failure abnormality, characterized by comprising:
acquiring a signal associated with a driving action of an intake valve of a variable valve timing mechanism;
judging whether the air inlet valve is in a stagnation state which can not normally act according to the change condition of the signal;
when the intake valve is in the stagnation state, a preset torque limiting protection program is executed to limit the actual output torque of the engine (3).
2. The method for processing a variable valve timing mechanism failure abnormality according to claim 1, characterized in that:
the signal includes at least one of a first signal for determining that the variable valve timing mechanism is stuck or retarded, and a second signal for determining that the variable valve timing mechanism line is short/open.
3. The method for processing a variable valve timing mechanism failure abnormality according to claim 2, characterized in that:
the first signal is acquired through an encoder of a driving motor of the intake valve;
and/or the second signal is an electrical signal acquired by detecting a line of the variable valve timing mechanism.
4. The method for processing a variable valve timing mechanism failure abnormality according to any one of claims 1 to 3, characterized in that the torque limiting protection program includes:
a corresponding engine torque limit is calculated based on the current engine speed and the actual output torque is limited below the engine torque limit.
5. The method for processing a variable valve timing mechanism failure abnormality according to claim 4, characterized in that said torque limiting protection program further includes:
calculating a corresponding control expected output torque value based on the current accelerator pedal opening;
the actual output torque is controlled by adjusting the intake air amount and the injection amount of the engine (3) with the smaller value of the engine torque limit value and the manipulation-intended output torque value as a torque output target value.
6. The method for processing a variable valve timing mechanism failure abnormality according to claim 4, characterized in that said calculating a corresponding engine torque limit value based on a current engine speed includes:
selecting a plurality of sample values in the variation range of the engine speed, and measuring and calculating the engine torque limit value corresponding to each sample value;
obtaining a change curve of the engine torque limit value relative to the engine speed by adopting an interpolation calculation method;
and calculating the current engine torque limit value corresponding to the engine speed through the change curve.
7. The method for processing a variable valve timing mechanism failure abnormality according to claim 6, characterized in that:
and each sample value is selected in the variation range of the engine speed above a preset minimum speed.
8. The method for processing a variable valve timing mechanism failure abnormality according to claim 6, characterized in that:
and selecting each sample value with the same rotation speed difference value in the variation range of the rotation speed of the engine.
9. A variable valve timing mechanism failure processing system, characterized by comprising:
an acquisition unit (5) for acquiring a signal associated with a driving action of an intake valve of the variable valve timing mechanism;
and the control unit (6) is connected with the acquisition unit (5) and the engine (3), judges whether the air inlet valve is in a stagnation state which can not normally act according to the change condition of the signal, and executes a preset torque limiting protection program when the air inlet valve is in the stagnation state so as to limit the actual output torque of the engine (3).
10. A vehicle, characterized in that:
the engine control device of a vehicle provided with the variable valve timing mechanism failure processing system according to claim 9.
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