CN111059283B - Control method for processing invalidation of engine side key CAN signal - Google Patents
Control method for processing invalidation of engine side key CAN signal Download PDFInfo
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- CN111059283B CN111059283B CN201911376983.8A CN201911376983A CN111059283B CN 111059283 B CN111059283 B CN 111059283B CN 201911376983 A CN201911376983 A CN 201911376983A CN 111059283 B CN111059283 B CN 111059283B
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- automatic gearbox
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1232—Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
Abstract
The invention discloses a control method for processing invalidation of key CAN signals at the engine side, which is characterized in that when the rotating speed of an output shaft of an automatic gearbox is detected to be more than or equal to a calibratable value, whether an engine torque signal, an accelerator opening degree signal and an engine rotating speed signal are effective or not is judged, and if yes, normal gear shifting control is carried out; judging the key CAN signal at the engine side, judging the correctness of message transmission, detecting whether the acquired message state signal value is 0, detecting whether the key CAN signal at the engine side is invalid and continues for a period of time, recording a fault code of the key signal at the engine side, and requesting to light a fault indicator lamp to control the engine to enter a limp home mode.
Description
Technical Field
The invention belongs to the technical field of automatic transmission control, and particularly relates to a control method for processing invalidation of key CAN signals on the engine side.
Background
The engine torque signal, the accelerator opening degree signal and the engine rotating speed signal belong to key CAN signals necessary for controlling an engine and a gearbox, and play a vital role in the whole gear shifting strategy of the automatic gearbox. In general, an automatic transmission Controller receives an engine torque signal, an accelerator opening degree signal and an engine speed signal sent by an engine Controller through a Controller Area Network (CAN) bus, and then shift strategy control is performed through a series of operations in software. However, under some conditions, the torque signal, the accelerator signal and the rotating speed signal of the engine side are incorrect due to some faults on one side of the engine, the engine controller replaces the incorrect signal value with an invalid value defined in a CAN signal matrix and transmits the invalid value to a CAN bus, when the automatic gearbox controller receives the invalid value of the key signal of the engine side from the CAN bus, the current torque signal, the accelerator opening degree signal and the engine rotating speed signal value of the engine are deemed to be unreliable, and certain protection measures CAN be taken inside software of the automatic gearbox controller to ensure the driving safety of the whole vehicle.
In the process of implementing the invention, the inventor finds that the prior art has at least the following defects: at present, the processing and control of the validity of the key CAN signal at the engine side is in a blank state, and when the automatic gearbox controller receives the invalid value of the key CAN signal at the engine side, the gearbox is controlled according to the conventional control logic, so that the gear shifting quality and the driving safety of the whole vehicle are seriously influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method for processing the invalidation of key CAN signals at the engine side, overcoming the defects of the existing control method, and realizing the protective measure of adopting control software to limp home when an automatic gearbox controller judges that the received engine torque signal, the received accelerator opening signal and the received engine rotating speed signal are invalid, thereby ensuring the dynamic gear shifting quality and the driving safety of the whole vehicle.
In order to solve the technical problems, the technical scheme of the invention is as follows: control method for handling engine side critical CAN signal invalidation comprising the steps of:
when the rotating speed of the output shaft of the automatic gearbox is detected to be larger than or equal to the calibratable value, judging whether an engine torque signal, an accelerator opening degree signal and an engine rotating speed signal are effective, and if so, performing normal gear shifting control; otherwise, adopting a limp home protection mode.
An optimization scheme comprises the following steps;
judging an output shaft rotating speed signal of the automatic gearbox:
and the automatic gearbox controller judges whether the rotating speed of the output shaft of the automatic gearbox is greater than or equal to a calibratable value or not, and when the rotating speed of the output shaft of the automatic gearbox is greater than or equal to the calibratable value, the automatic gearbox controller judges that the vehicle to which the automatic gearbox belongs has the vehicle speed.
An optimization scheme further comprises the following steps of judging key CAN signals at the engine side:
receiving an engine message containing an engine torque signal, an accelerator opening signal and an engine rotating speed signal through a CAN bus, and then entering step 104;
An optimization scheme further comprises a step 105 of judging the correctness of signals in the message transmission process:
checking and calculating the message where the key CAN signal is located, sending the calculated check sum to a CAN bus as a CAN signal of the message, comparing the self-calculated check sum with the transmitted check sum when receiving the message, and then entering step 106;
and step 106, judging whether the transmitted message checksum value is the same as the checksum value calculated by the automatic gearbox controller, if so, entering step 107, and otherwise, entering step 110.
An optimization scheme also comprises a step 107 of judging that message transmission is error-free and message checksum of a signal is correct, judging that a received key CAN signal at the engine side is invalid when the received values of an engine torque signal, an accelerator opening signal and an engine rotating speed signal are invalid values defined in a CAN signal matrix, and then entering a step 108;
and step 109, recording the invalid fault code of the key signal at the engine side, and requesting to light a fault indicator lamp to control the limp home mode.
An optimization scheme, step 110, does not make a determination as to the validity of the engine-side key signal.
An optimization scheme, step 111, shifts control according to normal control logic.
An optimization scheme, further comprising the steps of fault protection measures:
by adopting the technical scheme, compared with the prior art, the invention has the following advantages: the torque, the rotating speed and the throttle signal of the engine directly influence the gear control of the automatic gearbox, when the three signals are invalid at the same time, the automatic gearbox controller keeps the current gear in the D gear, enters the N gear of the software when entering the N gear, and then enters the limp home gear when returning to the D gear.
Drawings
FIG. 1 is a flow chart of a control method for handling engine side critical CAN signal invalidation in an embodiment of the present invention.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, and it will be understood by those skilled in the art that the following should not be construed as limiting the scope of the present invention.
In the embodiment, as shown in fig. 1, in a control method for processing the invalidation of the engine-side key CAN signal, the software of the automatic transmission controller judges the validity of the engine-side key signal on the premise of ensuring the current vehicle speed, because the dynamic shift quality and the overall vehicle safety are not influenced even if the engine-side key signal is invalid on the premise of no vehicle speed. The automatic gearbox controller software usually calculates the speed of the vehicle through an output shaft rotating speed signal, so that the judgment of whether the speed of the vehicle exists or not can be realized through judging whether the rotating speed of the output shaft is greater than or equal to a certain calibrated value or not. On the premise of the current vehicle speed, the automatic transmission controller judges the validity of an engine torque signal, an accelerator opening signal and an engine rotating speed signal, and when the signals are invalid, protective measures for controlling software to limp home are taken, specifically, the method comprises the following steps;
1) judging an output shaft rotating speed signal of the automatic gearbox:
the automatic gearbox controller calculates the speed of the vehicle according to the output shaft rotating speed signal value of the automatic gearbox, namely the automatic gearbox controller judges whether the rotating speed of the output shaft of the automatic gearbox is larger than or equal to a calibratable value or not, and when the rotating speed of the output shaft of the automatic gearbox is larger than or equal to the calibratable value, the automatic gearbox controller judges that the vehicle to which the automatic gearbox belongs has the speed of the vehicle.
2) Judging an engine side key CAN signal:
when the automatic transmission controller receives an engine message containing the engine torque signal, the accelerator opening signal and the engine rotating speed signal through a CAN bus, the validity of the message state CAN be judged firstly, namely the message transmission correctness is ensured, and the possibility that the signal value is invalid due to errors in the message transmission process is eliminated. When the message is not received never, the DLC error or the CAN message timeout fault exists in the message transmission process, the message transmission process is considered to have no error, i.e. the message state is valid, which is reflected in that the value of the collected message state signal is 0. And under the condition of ensuring the transmission correctness of the message of the key signal of the engine, the automatic gearbox controller judges whether the checksum of the message of the key signal is correct or not. The check sum calculation formula of the message of the engine key signal follows the CAN communication matrix definition formulated by the vehicle enterprises. The engine controller CAN check and calculate the message where the key signal is located according to a formula, the calculated check sum is used as a CAN signal of the message and sent to a CAN bus, when the automatic gearbox controller receives the message, the check sum of the received message is calculated based on the signal value of the message and a message check sum calculation formula, the self-calculated check sum is compared with the check sum transmitted by the engine controller, and when the message check sum value transmitted by the engine controller is the same as the check sum value calculated by the automatic gearbox controller, the signal value is considered to be free of errors in the message transmission process, namely the possibility of CAN signal transmission errors is eliminated.
Under the conditions that message transmission is correct and the message checksum of the signal is correct, if the received engine torque signal, the received accelerator opening signal and the received engine rotating speed signal value are all invalid values defined in the CAN signal matrix, the automatic transmission controller CAN judge that the received key CAN signal on the engine side is invalid.
When the automatic gearbox controller determines that the key CAN signal at the engine side is invalid and lasts for a period of time, which is set to 2000ms in this example, the fault CAN be calibrated according to different gearboxes, and the fault lasts for at least 2000ms, the situation that the key signal at the engine side is invalid is considered to exist.
When the two judgment conditions are simultaneously satisfied, namely the rotating speed of the output shaft of the automatic gearbox is greater than or equal to a calibratable value and the key signal at the engine side is judged to be invalid, the control software of the automatic gearbox considers that the key signal of the engine at the current state is unreliable, and the control logic and the driving safety at the automatic gearbox side are seriously influenced. To alert the driver, the automatic transmission controller will record a fault code that the engine-side key signal is invalid and request that the fault indicator light be illuminated. In order to ensure the dynamic gear shifting quality and the driving safety of the whole vehicle, fault protection measures for controlling the automatic gearbox to enter limp home are also adopted in the software of the controller of the automatic gearbox.
3) And a fault protection measure step:
the working principle of the protective measure for controlling the entering of the limp home mode comprises the following steps: the torque, the rotating speed and the throttle signal of the engine directly influence the gear control of the automatic gearbox, when the three signals are invalid at the same time, the automatic gearbox controller keeps the current gear in the D gear, enters the N gear of the software when entering the N gear, and then enters the limp home gear when returning to the D gear.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The scope of the present invention is defined by the appended claims, and any equivalent modifications based on the technical teaching of the present invention are also within the scope of the present invention.
Claims (3)
1. Control method for handling engine side critical CAN signal invalidation comprising the steps of:
when the rotating speed of the output shaft of the automatic gearbox is detected to be larger than or equal to the calibratable value, judging whether an engine torque signal, an accelerator opening degree signal and an engine rotating speed signal are effective, and if so, performing normal gear shifting control; otherwise, adopting a limp home protection mode;
judging an engine side key CAN signal:
step 101, detecting the current vehicle speed, and then entering step 102;
step 102, judging whether the current vehicle speed is greater than zero, if so, entering step 103, otherwise, entering step 110;
step 103, judging the correctness of message transmission:
receiving an engine message containing an engine torque signal, an accelerator opening signal and an engine rotating speed signal through a CAN bus, and then entering step 104;
104, detecting whether a message is never received, a DLC error or a CAN message overtime fault exists in the message transmission process, if not, the message state is valid, the value of the acquired message state signal is 0, and then entering a step 105, otherwise, entering a step 110;
step 105, judging the correctness of the signal in the message transmission process:
checking and calculating the message where the key CAN signal is located, sending the calculated check sum to a CAN bus as a CAN signal of the message, comparing the self-calculated check sum with the transmitted check sum when receiving the message, and then entering step 106;
step 106, judging whether the transmitted message checksum value is the same as the checksum value calculated by the automatic gearbox controller, if so, entering step 107, otherwise, entering step 110;
step 107, judging that the message transmission is correct and the message checksum of the signal is correct, judging that the received key CAN signal at the engine side is invalid when the received engine torque signal, the received accelerator opening signal and the received engine rotating speed signal value are all invalid values defined in a CAN signal matrix, and then entering step 108;
step 108, detecting whether a key CAN signal at the engine side is invalid and continues for a period of time, if so, entering step 109, otherwise, entering step 111;
step 109, recording a fault code of which the key signal of the engine side is invalid, and requesting to light a fault indicator lamp to control to enter a limp home mode;
step 110, not judging the validity of the key signals at the engine side;
and step 111, performing gear shifting control according to a normal control logic.
2. The control method for handling engine side critical CAN signal invalidation of claim 1, comprising the steps of;
judging an output shaft rotating speed signal of the automatic gearbox:
and the automatic gearbox controller judges whether the rotating speed of the output shaft of the automatic gearbox is greater than or equal to a calibratable value or not, and when the rotating speed of the output shaft of the automatic gearbox is greater than or equal to the calibratable value, the automatic gearbox controller judges that the vehicle to which the automatic gearbox belongs has the vehicle speed.
3. The control method for handling engine-side critical CAN signal failures of claim 1, further comprising a failsafe step of: the working principle of the protective measure for controlling the entering of the limp home mode comprises the following steps: the torque, the rotating speed and the throttle signal of the engine directly influence the gear control of the automatic gearbox, when the three signals are invalid at the same time, the automatic gearbox controller keeps the current gear in the D gear, enters the N gear of the software when entering the N gear, and then enters the limp home gear when returning to the D gear.
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| CN201911376983.8A CN111059283B (en) | 2019-12-27 | 2019-12-27 | Control method for processing invalidation of engine side key CAN signal |
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| CN201911376983.8A CN111059283B (en) | 2019-12-27 | 2019-12-27 | Control method for processing invalidation of engine side key CAN signal |
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