CN113219210A - Vehicle speed sensor signal rationality diagnosis method and system - Google Patents
Vehicle speed sensor signal rationality diagnosis method and system Download PDFInfo
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Abstract
The invention discloses a vehicle speed sensor signal rationality diagnosis method and a system, relating to the field of electronic and electric control of automobiles, wherein the method comprises the steps of obtaining an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS wheel speed sensor signal and a braking state; obtaining the vehicle speed according to the vehicle speed sensor signal, and obtaining the vehicle speed according to the ABS wheel speed sensor signal; calculating a vehicle speed difference value between a vehicle speed obtained based on a vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal; and obtaining a vehicle speed sensor signal rationality diagnosis result based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state. The invention can realize accurate diagnosis of the signal rationality of the vehicle speed sensor.
Description
Technical Field
The invention relates to the field of electronic and electrical control of automobiles, in particular to a method and a system for diagnosing the signal reasonability of a vehicle speed sensor.
Background
For the six-country vehicle type, the requirement of rationality diagnosis is provided for the key signals of the whole vehicle related to an engine system, and the rationality diagnosis requirement is reported as an OBD (On Board Diagnostics) fault. Currently, the diagnosis of the rationality of the vehicle speed sensor signal by the EECU (Engine Electronic Control Unit) mainly includes the following two types:
the first method comprises the following steps: the judgment is carried out based on the standard definition range of the vehicle speed signal in the vehicle bus message TCO1, and if the standard definition range exceeds the effective range defined by the J1939 protocol, the diagnosis is unreasonable. For example, the effective range of the vehicle speed bus signal defined by the J1939 protocol is 0-250.996 km/h, the 16-system of 250.996km/h corresponding to 2 bytes is 0xFAFF, the maximum 16-system of 2 bytes is 0xFFFF, and when the vehicle speed bus signal value is greater than 0xFAFF, the diagnosis result is that the vehicle speed sensor signal is unreasonable;
and the second method comprises the following steps: the method is judged based on the actual running condition of the whole vehicle, the speed of the whole commercial vehicle cannot exceed 150km/h under the normal condition, and when the speed signal of the whole vehicle exceeds 150km/h, the diagnosis is unreasonable.
According to the vehicle speed sensor signal rationality diagnosis method, for the first judgment method, the unreasonable judgment threshold of the vehicle speed sensor signal is set too widely, the judgment condition is too single, and the vehicle speed sensor signal rationality cannot be accurately judged, for example, when the vehicle speed sensor pulse is wrong, the vehicle speed signal is inaccurate, but the vehicle speed signal value is within 150km/h, the vehicle speed sensor signal rationality cannot be effectively judged at the moment; for the second judgment method, the diagnosis logic is not strict, and if the signal is abnormal due to the line problem of the vehicle speed sensor, the system can report two faults, namely an electrical fault and a rationality fault.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a vehicle speed sensor signal rationality diagnosis method and system, which can realize accurate diagnosis of vehicle speed sensor signal rationality.
In order to achieve the above object, the present invention provides a vehicle speed sensor signal rationality diagnostic method, which specifically comprises the following steps:
acquiring an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS wheel speed sensor signal and a braking state;
obtaining the vehicle speed according to the vehicle speed sensor signal, and obtaining the vehicle speed according to the ABS wheel speed sensor signal;
calculating a vehicle speed difference value between a vehicle speed obtained based on a vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal;
and obtaining a vehicle speed sensor signal rationality diagnosis result based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state.
ON the basis of the technical scheme, when the ignition lock is in an ON gear, the working state of the vehicle speed sensor is in a non-electrical fault state, the signal of the ABS wheel speed sensor is effective, the vehicle speed difference value is not greater than a set threshold value, the vehicle speed obtained according to the signal of the vehicle speed sensor is greater than the preset threshold value, and the brake signal does not exist in the brake state, the signal of the vehicle speed sensor is judged to be reasonable.
On the basis of the technical scheme, the vehicle speed sensor signal rationality diagnosis result comprises non-diagnosis ready, diagnosis ready and diagnosis no fault and diagnosis ready and diagnosis fault.
On the basis of the technical proposal, the device comprises a shell,
based on the ignition lock state, the working state of a vehicle speed sensor, ABS wheel speed sensor signals, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signals and the braking state, the rationality diagnosis result of the vehicle speed sensor signals is obtained, and the method specifically comprises the following steps:
diagnosing the rationality of the vehicle speed sensor signal periodically based on the state of an ignition lock, the working state of the vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state;
if and only if the first determination condition, the second determination condition, the third determination condition, the fourth determination condition and the fifth determination condition are all satisfied, determining whether the sixth determination condition is satisfied, if so, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and no fault is diagnosed, and if not, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and fault is diagnosed;
the first determination condition is that an ignition lock state is in an ON gear, the second determination condition is that a working state of a vehicle speed sensor is in a non-electrical fault state, the third determination condition is that an ABS wheel speed sensor signal is effective, the fourth determination condition is that a vehicle speed obtained according to the vehicle speed sensor signal is greater than a preset threshold value, the fifth determination condition is that a brake signal does not exist in a brake state, and the sixth determination condition is that a vehicle speed difference value is not greater than the preset threshold value.
On the basis of the above technical means, when any one of the first determination condition, the second determination condition, the third determination condition, the fourth determination condition and the fifth determination condition is not satisfied, the vehicle speed sensor signal rationality diagnosis result is a non-diagnosis ready.
On the basis of the technical proposal, the device comprises a shell,
when the rationality of the vehicle speed sensor signal is diagnosed periodically based ON the state of the ignition lock, the working state of the vehicle speed sensor, the signal of the ABS wheel speed sensor, the vehicle speed difference value, the vehicle speed obtained according to the signal of the vehicle speed sensor and the braking state, if the ON gear of the instrument ignition lock is powered off, the diagnosis is stopped.
On the basis of the technical scheme, when the rationality of the vehicle speed sensor signal is diagnosed periodically based on the state of an ignition lock, the working state of the vehicle speed sensor, the ABS wheel speed sensor signal, the vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, if the braking state is the existence of a braking signal, the diagnosis is suspended.
On the basis of the above technical solution, the judgment whether the sixth judgment condition is satisfied is specifically: and judging whether a vehicle speed difference value between the vehicle speed obtained based on the vehicle speed sensor signal and the vehicle speed obtained based on the ABS wheel speed sensor signal is not greater than a set threshold value within preset judging time, if so, meeting a sixth judging condition, and if not, meeting the sixth judging condition.
The invention provides a vehicle speed sensor signal rationality diagnosis system, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS (anti-lock brake system) wheel speed sensor signal and a braking state;
the first calculation module is used for obtaining the vehicle speed according to the vehicle speed sensor signal and obtaining the vehicle speed according to the ABS wheel speed sensor signal;
the second calculation module is used for calculating a vehicle speed difference value between a vehicle speed obtained based on the vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal;
and the diagnosis module is used for obtaining a vehicle speed sensor signal rationality diagnosis result based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state.
ON the basis of the technical scheme, when the ignition lock is in an ON gear, the working state of the vehicle speed sensor is in a non-electrical fault state, the signal of the ABS wheel speed sensor is effective, the vehicle speed difference value is not greater than a set threshold value, the vehicle speed obtained according to the signal of the vehicle speed sensor is greater than the preset threshold value, and the brake signal does not exist in the brake state, the signal of the vehicle speed sensor is judged to be reasonable.
Compared with the prior art, the invention has the advantages that: the method comprises the steps of obtaining an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS (anti-lock brake system) wheel speed sensor signal and a braking state, then calculating a vehicle speed difference value between a vehicle speed obtained based on the vehicle speed sensor signal and a vehicle speed obtained based on the ABS wheel speed sensor signal, and finally obtaining a vehicle speed sensor signal rationality diagnosis result based on the ignition lock state, the vehicle speed sensor working state, the ABS wheel speed sensor signal, the vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, so that accurate diagnosis of the vehicle speed sensor signal rationality is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a vehicle speed sensor signal rationality diagnostic method in an embodiment of the invention;
fig. 2 is a schematic diagram of the connection between devices in the embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a vehicle speed sensor signal rationality diagnosis method, which is characterized by obtaining an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS (anti-lock brake system) wheel speed sensor signal and a braking state, then calculating a vehicle speed difference value between a vehicle speed obtained based on the vehicle speed sensor signal and a vehicle speed obtained based on the ABS wheel speed sensor signal, and finally obtaining a vehicle speed sensor signal rationality diagnosis result based on the ignition lock state, the vehicle speed sensor working state, the ABS wheel speed sensor signal, the vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, so that the accurate diagnosis of the vehicle speed sensor signal rationality is realized. The embodiment of the invention correspondingly provides a vehicle speed sensor signal rationality diagnosis system.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a vehicle speed sensor signal rationality diagnosis method provided by the embodiment of the invention specifically includes the following steps:
s1: acquiring an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an Anti-lock Braking System (ABS) wheel speed sensor signal and a Braking state;
s2: and obtaining the vehicle speed according to the vehicle speed sensor signal, and obtaining the vehicle speed according to the ABS wheel speed sensor signal. The vehicle speed sensor signal contains vehicle speed information, the ABS wheel speed sensor signal also contains vehicle speed information, so that the vehicle speed can be obtained according to the vehicle speed sensor signal, the vehicle speed can also be obtained according to the ABS wheel speed sensor signal, and the vehicle speed obtained according to the vehicle speed sensor signal can be the same as or different from the vehicle speed obtained according to the ABS wheel speed sensor signal.
S3: calculating a vehicle speed difference value between a vehicle speed obtained based on a vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal;
s4: and obtaining a vehicle speed sensor signal rationality diagnosis result based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state.
When the vehicle speed sensor signal rationality diagnosis method based on the invention diagnoses the rationality of the vehicle speed sensor signal, as shown in fig. 2, the connection relationship between the devices and the instrument in the vehicle is that the vehicle speed sensor of the whole vehicle is connected to the instrument through a hard wire, the instrument diagnoses the vehicle speed sensor signal rationality, and transmits the vehicle speed sensor signal rationality to an EECU (Engine Electronic Control Unit) through a private message, and the vehicle speed sensor signal rationality is reported by the EECU. The ABS, VECU (Vehicle Control Unit) and EECU are all connected to the meter via a bus. The instrument takes ABS wheel speed sensor signals as reference, simultaneously considers the electrical faults of vehicle speed sensor signals, considers the running states of the whole vehicle such as braking and the like, possibly brings misjudgment, and forms a set of perfect diagnosis logic. The rationality of the vehicle speed sensor signal is taken as a fault, although the fault is diagnosed by an instrument, the fault is actually reported by an EECU, so that the instrument transmits a diagnosis state and a diagnosis result to the EECU, and three states are defined for the fault according to an OBD (On Board Diagnostics) fault diagnosis requirement: the vehicle speed sensor signal rationality diagnostic results include not ready for diagnosis, ready for diagnosis and diagnosed as no fault and ready for diagnosis and diagnosed as fault, i.e., in the present invention, the vehicle speed sensor signal rationality diagnostic results include not ready for diagnosis, ready for diagnosis and diagnosed as no fault and ready for diagnosis and diagnosed as fault. The diagnosis ready indicates whether a successful diagnosis is completed, regardless of the diagnosis result.
In the invention, the actual running condition of the whole vehicle is considered, the speed and the wheel speed change are not synchronous under special working conditions, for example, when the vehicle is braked, the ABS wheel speed sensor signal changes greatly, and the speed sensor signal is gradual, which may cause misjudgment on the speed difference; for example, when the vehicle starts, the difference between the signal of the vehicle speed sensor and the signal of the wheel speed sensor of the ABS may be large.
In the embodiment of the invention, the vehicle speed sensor signal rationality diagnosis result is obtained based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, and the concrete steps comprise:
s401: diagnosing the rationality of the vehicle speed sensor signal periodically based on the state of an ignition lock, the working state of the vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state;
s402: and if and only if the first determination condition, the second determination condition, the third determination condition, the fourth determination condition and the fifth determination condition are all satisfied, determining whether the sixth determination condition is satisfied, if so, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and no fault is diagnosed, and if not, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and fault is diagnosed.
The first judgment condition is that the state of an ignition lock is in an ON gear, the second judgment condition is that the working state of a vehicle speed sensor is free of electrical faults, the third judgment condition is that an ABS wheel speed sensor signal is effective, the fourth judgment condition is that the vehicle speed obtained according to the vehicle speed sensor signal is greater than a preset threshold value, the fifth judgment condition is that a brake signal does not exist in a brake state, and the sixth judgment condition is that the difference value of the vehicle speed is not greater than the set threshold value.
In the embodiment of the invention, when any one of the first determination condition, the second determination condition, the third determination condition, the fourth determination condition and the fifth determination condition is not satisfied, the vehicle speed sensor signal rationality diagnosis result is not ready for diagnosis.
For the first determination condition, it is considered that the instrument actually starts to operate after the ON gear is powered ON, and ON the other hand, the instrument receives a bus signal sent by another ECU (Electronic Control Unit) from a CAN (Controller Area Network) bus, so that the ignition lock is required to be placed in the ON gear, and the vehicle CAN bus operates.
For the second determination condition, the rationality diagnosis of the vehicle speed sensor signal is performed on the premise that the sensor itself is normal and the sensor electrical line connection is normal, so that electrical fault conditions such as vehicle speed sensor switching, short-circuit to the power supply, short-circuit to the ground and the like are eliminated.
For the third determination condition, the vehicle speed sensor signal plausibility diagnosis is based on the ABS wheel speed sensor signal as a comparison reference, and therefore, the wheel speed signal itself is also a precondition for comparison within the valid range.
For the fourth determination condition, the vehicle speed and the wheel speed signal change are not synchronized when the vehicle is started, and the speed limit is defined to be 20km/h by considering the national six OBD regulation, so the preset threshold value can be set to be 20 km/h.
Regarding the fifth determination condition, when the vehicle braking is considered, the wheel speed and the vehicle speed change asynchronously, the wheel speed can change rapidly, the vehicle speed cannot, and if the diagnosis is not ready yet, the brake signal appears, and the fifth determination condition is not satisfied.
In the sixth determination condition, for setting the magnitude of the set threshold value, the deviation between the vehicle speed and the wheel speed is not a fixed value in consideration of different vehicle speeds, but basically, the higher the vehicle speed, the larger the deviation.
In the embodiment of the invention, when the rationality of the vehicle speed sensor signal is diagnosed periodically based ON the state of the ignition lock, the working state of the vehicle speed sensor, the signal of the ABS wheel speed sensor, the vehicle speed difference value, the vehicle speed obtained according to the signal of the vehicle speed sensor and the braking state, if the ON gear of the ignition lock of the instrument is powered off, the diagnosis is stopped.
In the embodiment of the invention, when the rationality of the vehicle speed sensor signal is diagnosed periodically based on the state of the ignition lock, the working state of the vehicle speed sensor, the ABS wheel speed sensor signal, the vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, if the braking state is that a braking signal exists, the diagnosis is suspended, and the last diagnosis result is sent.
In the embodiment of the present invention, the determination as to whether the sixth determination condition is satisfied specifically includes: and judging whether a vehicle speed difference value between the vehicle speed obtained based on the vehicle speed sensor signal and the vehicle speed obtained based on the ABS wheel speed sensor signal is not greater than a set threshold value within preset judging time, if so, meeting a sixth judging condition, and if not, meeting the sixth judging condition. The preset determination time may be 30 s.
According to the vehicle speed sensor signal rationality diagnosis method, the ignition lock state, the vehicle speed sensor working state, the vehicle speed sensor signal, the ABS wheel speed sensor signal and the braking state are obtained, then the vehicle speed difference value between the vehicle speed obtained based on the vehicle speed sensor signal and the vehicle speed obtained based on the ABS wheel speed sensor signal is calculated, and finally the vehicle speed sensor signal rationality diagnosis result is obtained based on the ignition lock state, the vehicle speed sensor working state, the ABS wheel speed sensor signal, the vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, so that the vehicle speed sensor signal rationality is accurately diagnosed.
Embodiments of the present invention also provide a readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the above-described convenient storage method. The method specifically comprises the following steps:
acquiring an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS wheel speed sensor signal and a braking state;
obtaining the vehicle speed according to the vehicle speed sensor signal, and obtaining the vehicle speed according to the ABS wheel speed sensor signal;
calculating a vehicle speed difference value between a vehicle speed obtained based on a vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal;
and obtaining a vehicle speed sensor signal rationality diagnosis result based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state.
In embodiments of the present invention, a storage medium may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer-readable storage medium may be, for example but not limited to: an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The vehicle speed sensor signal rationality diagnosis system provided by the embodiment of the invention comprises an acquisition module, a first calculation module, a second calculation module and a diagnosis module.
The acquisition module is used for acquiring an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS wheel speed sensor signal and a braking state; the first calculation module is used for obtaining the vehicle speed according to the vehicle speed sensor signal and obtaining the vehicle speed according to the ABS wheel speed sensor signal; the second calculation module is used for calculating a vehicle speed difference value between a vehicle speed obtained based on the vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal; the diagnosis module is used for obtaining a vehicle speed sensor signal rationality diagnosis result based on an ignition lock state, a vehicle speed sensor working state, an ABS wheel speed sensor signal, a vehicle speed difference value, a vehicle speed obtained according to the vehicle speed sensor signal and a brake state.
In the embodiment of the invention, when the ignition lock is in an ON gear, the working state of the vehicle speed sensor is no electrical fault, the signal of the ABS wheel speed sensor is effective, the vehicle speed difference is not greater than the set threshold, the vehicle speed obtained according to the signal of the vehicle speed sensor is greater than the preset threshold, and the braking state is that no braking signal exists, the signal of the vehicle speed sensor is judged to be reasonable.
In an embodiment of the invention, the vehicle speed sensor signal rationality diagnostic results include not ready for diagnosis, ready for diagnosis and diagnosed as no fault and ready for diagnosis and diagnosed as fault.
In the embodiment of the invention, the vehicle speed sensor signal rationality diagnosis result is obtained based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, and the concrete steps comprise:
diagnosing the rationality of the vehicle speed sensor signal periodically based on the state of an ignition lock, the working state of the vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state;
if and only if the first determination condition, the second determination condition, the third determination condition, the fourth determination condition and the fifth determination condition are all satisfied, determining whether the sixth determination condition is satisfied, if so, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and no fault is diagnosed, and if not, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and fault is diagnosed;
the first determination condition is that an ignition lock state is in an ON gear, the second determination condition is that a working state of a vehicle speed sensor is in a non-electrical fault state, the third determination condition is that an ABS wheel speed sensor signal is effective, the fourth determination condition is that a vehicle speed obtained according to the vehicle speed sensor signal is greater than a preset threshold value, the fifth determination condition is that a brake signal does not exist in a brake state, and the sixth determination condition is that a vehicle speed difference value is not greater than the preset threshold value.
In the embodiment of the invention, when any one of the first determination condition, the second determination condition, the third determination condition, the fourth determination condition and the fifth determination condition is not satisfied, the vehicle speed sensor signal rationality diagnosis result is not ready for diagnosis.
When the rationality of the vehicle speed sensor signal is diagnosed periodically based ON the state of the ignition lock, the working state of the vehicle speed sensor, the signal of the ABS wheel speed sensor, the vehicle speed difference value, the vehicle speed obtained according to the signal of the vehicle speed sensor and the braking state, if the ON gear of the instrument ignition lock is powered off, the diagnosis is stopped.
When the rationality of the vehicle speed sensor signal is diagnosed periodically based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, if the braking state is that a braking signal exists, the diagnosis is suspended.
The judgment on whether the sixth judgment condition is satisfied is specifically as follows: and judging whether a vehicle speed difference value between the vehicle speed obtained based on the vehicle speed sensor signal and the vehicle speed obtained based on the ABS wheel speed sensor signal is not greater than a set threshold value within preset judging time, if so, meeting a sixth judging condition, and if not, meeting the sixth judging condition.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (10)
1. A vehicle speed sensor signal rationality diagnosis method is characterized by specifically comprising the following steps:
acquiring an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS wheel speed sensor signal and a braking state;
obtaining the vehicle speed according to the vehicle speed sensor signal, and obtaining the vehicle speed according to the ABS wheel speed sensor signal;
calculating a vehicle speed difference value between a vehicle speed obtained based on a vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal;
and obtaining a vehicle speed sensor signal rationality diagnosis result based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state.
2. A vehicle speed sensor signal rationality diagnostic method according to claim 1, characterized in that: when the ignition lock is in an ON gear, the working state of the vehicle speed sensor is in a non-electrical fault state, the signal of the ABS wheel speed sensor is effective, the vehicle speed difference value is not greater than a set threshold value, the vehicle speed obtained according to the signal of the vehicle speed sensor is greater than a preset threshold value, and the brake signal is not present in the brake state, the signal of the vehicle speed sensor is judged to be reasonable.
3. A vehicle speed sensor signal rationality diagnostic method according to claim 1, characterized in that: the vehicle speed sensor signal rationality diagnostic includes no diagnostic ready, diagnostic ready and diagnostic no fault and diagnostic ready and diagnostic fault.
4. A vehicle speed sensor signal rationality diagnostic method according to claim 3, characterized in that:
based on the ignition lock state, the working state of a vehicle speed sensor, ABS wheel speed sensor signals, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signals and the braking state, the rationality diagnosis result of the vehicle speed sensor signals is obtained, and the method specifically comprises the following steps:
diagnosing the rationality of the vehicle speed sensor signal periodically based on the state of an ignition lock, the working state of the vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state;
if and only if the first determination condition, the second determination condition, the third determination condition, the fourth determination condition and the fifth determination condition are all satisfied, determining whether the sixth determination condition is satisfied, if so, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and no fault is diagnosed, and if not, determining that the vehicle speed sensor signal rationality diagnosis result is ready for diagnosis and fault is diagnosed;
the first determination condition is that an ignition lock state is in an ON gear, the second determination condition is that a working state of a vehicle speed sensor is in a non-electrical fault state, the third determination condition is that an ABS wheel speed sensor signal is effective, the fourth determination condition is that a vehicle speed obtained according to the vehicle speed sensor signal is greater than a preset threshold value, the fifth determination condition is that a brake signal does not exist in a brake state, and the sixth determination condition is that a vehicle speed difference value is not greater than the preset threshold value.
5. A vehicle speed sensor signal rationality diagnostic method according to claim 4, characterized in that: when any one of the first, second, third, fourth, and fifth determination conditions is not satisfied, the vehicle speed sensor signal rationality diagnosis result is not ready for diagnosis.
6. A vehicle speed sensor signal rationality diagnostic method according to claim 4, characterized in that:
when the rationality of the vehicle speed sensor signal is diagnosed periodically based ON the state of the ignition lock, the working state of the vehicle speed sensor, the signal of the ABS wheel speed sensor, the vehicle speed difference value, the vehicle speed obtained according to the signal of the vehicle speed sensor and the braking state, if the ON gear of the instrument ignition lock is powered off, the diagnosis is stopped.
7. A vehicle speed sensor signal rationality diagnostic method according to claim 4, characterized in that: when the rationality of the vehicle speed sensor signal is diagnosed periodically based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state, if the braking state is that a braking signal exists, the diagnosis is suspended.
8. The vehicle speed sensor signal rationality diagnostic method according to claim 4, characterized in that the judgment as to whether or not the sixth judgment condition is satisfied is specifically: and judging whether a vehicle speed difference value between the vehicle speed obtained based on the vehicle speed sensor signal and the vehicle speed obtained based on the ABS wheel speed sensor signal is not greater than a set threshold value within preset judging time, if so, meeting a sixth judging condition, and if not, meeting the sixth judging condition.
9. A vehicle speed sensor signal rationality diagnostic system, characterized by comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring an ignition lock state, a vehicle speed sensor working state, a vehicle speed sensor signal, an ABS (anti-lock brake system) wheel speed sensor signal and a braking state;
the first calculation module is used for obtaining the vehicle speed according to the vehicle speed sensor signal and obtaining the vehicle speed according to the ABS wheel speed sensor signal;
the second calculation module is used for calculating a vehicle speed difference value between a vehicle speed obtained based on the vehicle speed sensor signal and a vehicle speed obtained based on an ABS wheel speed sensor signal;
and the diagnosis module is used for obtaining a vehicle speed sensor signal rationality diagnosis result based on the state of an ignition lock, the working state of a vehicle speed sensor, an ABS wheel speed sensor signal, a vehicle speed difference value, the vehicle speed obtained according to the vehicle speed sensor signal and the braking state.
10. The vehicle speed sensor signal rationality diagnostic system according to claim 9, characterized in that the vehicle speed sensor signal is judged to be rational when the ignition lock state is in the ON-range, the vehicle speed sensor operating state is no electrical fault, the ABS wheel speed sensor signal is valid, the vehicle speed difference is not greater than the set threshold, the vehicle speed obtained from the vehicle speed sensor signal is greater than the preset threshold, and the braking state is no braking signal.
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