阅读说明：本技术 车速信号的采集方法 (Vehicle speed signal acquisition method ) 是由 胡海涛 李彬 王满 刘庆庆 贾先培 余建安 于 2021-10-22 设计创作，主要内容包括：本发明公开了车速信号的采集方法,ABS通过轮速传感器采集四轮的轮速传感器输出的脉冲信号,并进行滤波、分析、运算后,将计算结果转换成轮速占空比信号/车速数字信号。采用上述技术方案,能满足整车各控制模块对车速信号的需求；避免零部件的重复开发,缩短了整车开发周期、降低了产品开发费用、降低了整车成本。(The invention discloses a vehicle speed signal acquisition method, wherein an ABS acquires pulse signals output by wheel speed sensors of four wheels through the wheel speed sensors, and converts calculation results into wheel speed duty ratio signals/vehicle speed digital signals after filtering, analysis and operation. By adopting the technical scheme, the requirement of each control module of the whole vehicle on a vehicle speed signal can be met; repeated development of parts is avoided, the development period of the whole vehicle is shortened, the development cost of products is reduced, and the cost of the whole vehicle is reduced.)

1. The vehicle speed signal acquisition method is characterized by comprising the following steps: an anti-lock braking system (ABS) collects pulse signals output by wheel speed sensors of four wheels through the wheel speed sensors, and converts calculation results into wheel speed duty ratio signals/vehicle speed digital signals after filtering, analyzing and calculating.

2. The method for acquiring a vehicle speed signal according to claim 1, characterized in that: after an anti-lock braking module (ABS) converts a calculation result into a wheel speed duty ratio signal, the anti-lock braking module (ABS) transmits the wheel speed duty ratio signal to an Engine electronic control unit (Engine ECU) through a hard wire;

an Engine electronic control unit (Engine ECU) filters, analyzes and calculates a wheel speed duty ratio signal input by an anti-lock brake module (ABS), and converts a calculation result into a vehicle speed digital signal;

and finally, sending the vehicle speed digital signal to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU) and a vehicle-mounted diagnosis module (OBD) in a CAN message form through the CAN, and realizing the functions of the modules related to the vehicle speed signal.

3. The method for acquiring a vehicle speed signal according to claim 1, characterized in that: after the anti-lock brake module (ABS) completes the conversion of the calculation result into a wheel speed duty ratio signal, the anti-lock brake module (ABS) sends a vehicle speed digital signal to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU), an Engine electronic control unit (Engine ECU) and an on-board diagnostic module (OBD) in a CAN message mode through a CAN, and the functions of the modules related to the vehicle speed signal are realized.

4. A method of acquiring a vehicle speed signal according to claim 2 or 3, characterized in that: the combination meter (ICM) receives the vehicle speed signal to display the vehicle speed: the combination Instrument (ICM) receives the CAN message, reads in the CPU, and controls the analog amplification circuit to drive the stepping motor to rotate through the CPU control port so as to indicate the corresponding vehicle speed value.

5. A method of acquiring a vehicle speed signal according to claim 2 or 3, characterized in that: the vehicle Body Controller (BCM) receives a vehicle speed signal to realize automatic unlocking and locking: and a vehicle Body Controller (BCM) receives the CAN message, reads in a CPU (Central processing Unit) and simultaneously combines with the unlocking and locking speed which is initially set, and controls the automatic unlocking and locking actions of the four-door lock through a CPU control port, thereby completing the automatic unlocking and locking of the five-door lock.

6. A method of acquiring a vehicle speed signal according to claim 2 or 3, characterized in that: the electric power steering system (EPS) receives a vehicle speed signal to realize torque control: and an electric power steering system (EPS) receives the CAN message, reads in a CPU, performs analysis and calculation by combining signals of the torque sensor, and controls the rotation direction and the power-assisted current of a steering motor through a CPU control port.

7. A method of acquiring a vehicle speed signal according to claim 2 or 3, characterized in that: the safety air bag control unit (Airbag ECU) receives a vehicle speed signal to control the detonation time of the safety air bag: an air bag control unit (Airbag ECU) receives the CAN message, reads in a CPU and performs analysis and calculation by combining with an acceleration signal of a collision sensor; when the safety airbag needs to be detonated, the airbag igniter is driven to detonate the safety airbag through the CPU control port.

8. A method of acquiring a vehicle speed signal according to claim 2 or 3, characterized in that: the vehicle-mounted diagnosis module (OBD) performs CAN message reading and writing functions with a whole vehicle CAN network through an OBD diagnosis port, and detects a vehicle speed signal so as to achieve the purposes of real-time dynamic data reading, fault diagnosis, fault maintenance and fault clearing.

9. A method of acquiring a vehicle speed signal as claimed in claim 3, wherein: the Engine electronic control unit (Engine ECU) receives the CAN message, reads the CAN message into the CPU, performs data analysis and operation through the CPU, and controls ignition and fuel injection regulation of the Engine, so that the dynamic property of the Engine and the driving comfort of the vehicle are improved.

Technical Field

The invention belongs to the technical field of vehicle electronic control information systems. More particularly, the present invention relates to a method of acquiring a vehicle speed signal.

Background

Along with the development of automobile intellectualization, each system of an automobile has more and more requirements on speed signals, a traditional fuel oil vehicle transmits digital pulse signals collected by a speed sensor of a gearbox to a combination Instrument (ICM) through a hard wire, the combination instrument receives the pulse signals through a single chip microcomputer and calculates the speed by combining a rear axle transmission ratio and a tire size, then a stepping motor is driven to drive a pointer to rotate to indicate a corresponding speed value, the speed signals are converted into duty ratio signals, and the duty ratio signals are transmitted to an Engine electronic control unit (Engine ECU) through the hard wire;

because the functions and the configurations of modern automobile configuration are rich, an electric power steering module (EPS), a Body Control Module (BCM), an anti-lock brake module (ABS) and an air bag control module (Airbag ECU) need to be combined with a vehicle speed signal to analyze and calculate and then realize corresponding functions and actions, and in addition, the information demand and the transmission quantity between the modules are larger and larger by combining the national emission and the upgrade of the current traditional fuel vehicle, so that the quantity of sensors and transmission wires is increased sharply, and the difficulty of fault maintenance is increased.

Disclosure of Invention

The invention provides a method for acquiring a vehicle speed signal, and aims to acquire the vehicle speed signal by using a wheel speed sensor and reduce the cost.

In order to achieve the purpose, the vehicle speed signal acquisition method adopts the following technical scheme:

an anti-lock braking system (ABS) collects pulse signals output by wheel speed sensors of four wheels through the wheel speed sensors, and converts calculation results into wheel speed duty ratio signals/vehicle speed digital signals after filtering, analyzing and calculating.

The specific first technical scheme is as follows:

after the anti-lock brake module (ABS) converts the calculation result into a wheel speed duty ratio signal, the anti-lock brake module (ABS) transmits the wheel speed duty ratio signal to an Engine electronic control unit (Engine ECU) through a hard wire;

an Engine electronic control unit (Engine ECU) filters, analyzes and calculates a wheel speed duty ratio signal input by an anti-lock brake module (ABS), and converts a calculation result into a vehicle speed digital signal;

and finally, sending the vehicle speed digital signal to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU) and a vehicle-mounted diagnosis module (OBD) in a CAN message form through the CAN, and realizing the functions of the modules related to the vehicle speed signal.

The specific second technical scheme is as follows:

after the anti-lock brake module (ABS) completes the conversion of the calculation result into a vehicle speed digital signal, the anti-lock brake module (ABS) sends the vehicle speed digital signal to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU), an Engine electronic control unit (Engine ECU) and an on-board diagnostic module (OBD) in a CAN message mode through a CAN, and the functions of the modules related to the vehicle speed signal are realized.

The Engine electronic control unit (Engine ECU) receives the CAN message, reads the CAN message into the CPU, performs data analysis and operation through the CPU, and controls ignition and fuel injection regulation of the Engine, so that the dynamic property of the Engine and the driving comfort of the vehicle are improved.

Furthermore, on the basis of the two technical schemes, the following technical schemes are respectively adopted:

the combination meter (ICM) receives the vehicle speed signal to display the vehicle speed: the combination Instrument (ICM) receives the CAN message, reads in the CPU, and controls the analog amplification circuit to drive the stepping motor to rotate through the CPU control port so as to indicate the corresponding vehicle speed value.

The vehicle Body Controller (BCM) receives a vehicle speed signal to realize automatic unlocking and locking: and a vehicle Body Controller (BCM) receives the CAN message, reads in a CPU (Central processing Unit) and simultaneously combines with the unlocking and locking speed which is initially set, and controls the automatic unlocking and locking actions of the four-door lock through a CPU control port, thereby completing the automatic unlocking and locking of the five-door lock.

The electric power steering system (EPS) receives a vehicle speed signal to realize torque control: and an electric power steering system (EPS) receives the CAN message, reads in a CPU, performs analysis and calculation by combining signals of the torque sensor, and controls the rotation direction and the power-assisted current of a steering motor through a CPU control port.

The safety air bag control unit (Airbag ECU) receives a vehicle speed signal to control the detonation time of the safety air bag: an air bag control unit (Airbag ECU) receives the CAN message, reads in a CPU and performs analysis and calculation by combining with an acceleration signal of a collision sensor; when the safety airbag needs to be detonated, the airbag igniter is driven to detonate the safety airbag through the CPU control port.

The vehicle-mounted diagnosis module (OBD) performs CAN message reading and writing functions with a whole vehicle CAN network through an OBD diagnosis port, and detects a vehicle speed signal so as to achieve the purposes of real-time dynamic data reading, fault diagnosis, fault maintenance and fault clearing.

By adopting the technical scheme, the speed sensor of the gearbox in the prior art is eliminated, the ABS wheel speed sensor is used for acquiring wheel speed signals, and meanwhile, the requirements of each control module of the whole vehicle on the speed signals can be met by utilizing the strong data operation, analysis and processing capabilities of the ABS/engine ECU; the wheel speed pulse signals collected by the ABS wheel speed sensor are converted into vehicle speed digital signals, and the vehicle speed digital signals are sent to each functional module in a CAN message mode through the CAN bus, so that corresponding functions are realized, repeated development of parts such as a combination instrument and a gearbox vehicle speed sensor is avoided, the development period of the whole vehicle is shortened, the product development cost is reduced, the cost of the whole vehicle is reduced, and the application of the platform and the universalization of the parts is promoted.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of the vehicle speed signal acquisition and transmission of the present invention;

fig. 2 is a schematic diagram of a second technical scheme of vehicle speed signal acquisition and transmission of the invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.

As shown in fig. 1 and 2: the invention relates to a vehicle speed signal acquisition, transmission and processing structure, in particular to a vehicle speed signal acquisition method.

In order to overcome the defects of the prior art and achieve the invention aims of acquiring a vehicle speed signal by using a wheel speed sensor and reducing the cost, the invention adopts a first technical scheme that:

as shown in fig. 1, an anti-lock braking system (ABS) acquires a pulse signal output from a wheel speed sensor of four wheels through the wheel speed sensor, and converts the calculation result into a wheel speed duty ratio signal/vehicle speed digital signal after filtering, analyzing and calculating;

then, transmitting the wheel speed duty ratio signal to an Engine electronic control unit (Engine ECU) through a hard wire;

an Engine electronic control unit (Engine ECU) filters, analyzes and calculates a wheel speed duty ratio signal input by an anti-lock brake module (ABS), and converts a calculation result into a vehicle speed digital signal;

and finally, sending the vehicle speed digital signal to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU) and a vehicle-mounted diagnosis module (OBD) in a CAN message form through the CAN, and realizing the functions of the modules related to the vehicle speed signal.

In the first technical scheme, the wheel rotates, the wheel speed sensor acquires wheel speed signals through the wheel speed sensor, digital pulse signals are output, the ABS acquires pulse signals output by the four wheel speed sensors, the pulse signals are filtered, analyzed and calculated and then converted into duty ratio signals, the duty ratio signals are transmitted to the engine ECU through a hard wire, the engine ECU acquires, filters, analyzes and calculates the input duty ratio signals and converts calculation results into digital signals, finally the converted digital signals are sent to each module through the CAN chip in the form of CAN messages to achieve various functions, the combination instrument ICM receives the vehicle speed signals to perform vehicle speed display, the EPS receives the vehicle speed signals to achieve torque control, the BCM receives the vehicle speed signals to achieve automatic locking and unlocking, the Airbag ECU receives the vehicle speed signals to control the detonation time of the air bag, and meanwhile, the requirements of each module and OBD diagnosis are met.

The Engine electronic control unit (Engine ECU): storing a rear axle transmission ratio parameter, a wheel radius parameter and a duty ratio corresponding tire rotating speed parameter in an Engine ECU; the Engine ECU acquires ABS input duty ratio signals, carries out filtering processing on the signals, then inputs the signals into an ECU processor, the processor calculates the current real-time speed through a speed calculation function by combining a rear axle transmission ratio, wheel radius parameters and a tire rotating speed list corresponding to the duty ratio, and sends the current real-time speed to a combination Instrument (ICM), an electric power steering module (EPS), a vehicle Body Control Module (BCM) and an Airbag control module (Airbag ECU) in a CAN message form through a CAN chip.

The second technical scheme adopted by the invention is as follows:

as shown in fig. 2, an anti-lock braking system (ABS) acquires a pulse signal output from a wheel speed sensor of four wheels through the wheel speed sensor, and converts a calculation result into a vehicle speed digital signal after filtering, analyzing and calculating; and finally, sending the vehicle speed digital signal to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU), an Engine electronic control unit (Engine ECU) and an on-board diagnostic module (OBD) in a CAN message mode through the CAN to realize the functions of the modules related to the vehicle speed signal.

The Engine electronic control unit (Engine ECU) receives the CAN message, reads the CAN message into the CPU, performs data analysis and operation through the CPU, and controls ignition and fuel injection regulation of the Engine, so that the dynamic property of the Engine and the driving comfort of the vehicle are improved.

In the second technical scheme, the wheel rotates, the wheel speed sensor acquires wheel speed signals and outputs digital pulse signals, and the ABS acquires the pulse signals output by the four wheel speed sensors, and the pulse signals are filtered, analyzed and calculated and then converted into vehicle speed digital signals; and finally, the converted digital signals are sent to each module in a CAN message form through a CAN chip to realize each function, the combination instrument receives a vehicle speed signal to display the vehicle speed, the EPS receives the vehicle speed signal to realize torque control, the BCM receives the vehicle speed signal to realize automatic unlocking and locking, the Airbag ECU receives the vehicle speed signal to control the Airbag to detonate, and meanwhile, the requirements of each module and OBD diagnosis are met.

The specific functions of the modules in the invention are as follows:

the Wheel Speed Sensor (WSS): the rear axle drives wheels to rotate, gears on the front axle and the rear axle cut four-wheel WSS magnetic induction lines through the electromagnetic induction principle, and four-wheel digital pulse signals are generated and output and transmitted to the ABS through hard lines.

The anti-lock brake module (ABS): the ABS collects digital pulse signals input by the four-wheel WSS, filters the pulse signals and reads the pulse signals into the processor, the processor drives the analog amplification motor through the control port to drive the ABS valve body and the motor to act through analysis and operation, so that the ABS anti-lock function is achieved, and meanwhile the processor calculates the digital pulse signals input by the four-wheel WSS, converts the digital pulse signals into duty ratio signals and transmits the duty ratio signals to the Engine ECU through hard wires.

The combination meter (ICM) receives the vehicle speed signal to display the vehicle speed: the combination Instrument (ICM) receives the CAN message, reads in the CPU, and controls the analog amplification circuit to drive the stepping motor to rotate through the CPU control port so as to indicate the corresponding vehicle speed value.

The vehicle Body Controller (BCM) receives a vehicle speed signal to realize automatic unlocking and locking: and a vehicle Body Controller (BCM) receives the CAN message, reads in a CPU (Central processing Unit) and simultaneously combines with the unlocking and locking speed which is initially set, and controls the automatic unlocking and locking actions of the four-door lock through a CPU control port, thereby completing the automatic unlocking and locking of the five-door lock.

The electric power steering system (EPS) receives a vehicle speed signal to realize torque control: and an electric power steering system (EPS) receives the CAN message, reads in a CPU, performs analysis and calculation by combining signals of the torque sensor, and controls the rotation direction and the power-assisted current of a steering motor through a CPU control port.

The safety air bag control unit (Airbag ECU) receives a vehicle speed signal to control the detonation time of the safety air bag: an air bag control unit (Airbag ECU) receives the CAN message, reads in a CPU and performs analysis and calculation by combining with an acceleration signal of a collision sensor; when the safety airbag needs to be detonated, the airbag igniter is driven to detonate the safety airbag through the CPU control port.

The vehicle-mounted diagnosis module (OBD) performs CAN message reading and writing functions with a whole vehicle CAN network through an OBD diagnosis port, and detects a vehicle speed signal so as to achieve the purposes of real-time dynamic data reading, fault diagnosis, fault maintenance and fault clearing.

The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.