CN113799750B - Method for collecting vehicle speed signal - Google Patents

Method for collecting vehicle speed signal Download PDF

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Publication number
CN113799750B
CN113799750B CN202111232940.XA CN202111232940A CN113799750B CN 113799750 B CN113799750 B CN 113799750B CN 202111232940 A CN202111232940 A CN 202111232940A CN 113799750 B CN113799750 B CN 113799750B
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vehicle speed
signal
air bag
receives
vehicle
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CN113799750A (en
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胡海涛
李彬
王满
刘庆庆
贾先培
余建安
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Chery Commercial Vehicle Anhui Co Ltd
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Chery Commercial Vehicle Anhui Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
    • B60T8/1725—Using tyre sensors, e.g. Sidewall Torsion sensors [SWT]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/28—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor characterised by the type of the output information, e.g. video entertainment or vehicle dynamics information; characterised by the purpose of the output information, e.g. for attracting the attention of the driver
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/85—Arrangements for transferring vehicle- or driver-related data
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
    • B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
    • B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17—Using electrical or electronic regulation means to control braking
    • B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
    • B60T8/1761—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/20—Conjoint control of vehicle sub-units of different type or different function including control of steering systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/30—Conjoint control of vehicle sub-units of different type or different function including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/16—Type of output information
    • B60K2360/167—Vehicle dynamics information
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/586—Wired data transfers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R2021/0104—Communication circuits for data transmission
    • B60R2021/01047—Architecture
    • B60R2021/01054—Bus
    • B60R2021/01068—Bus between different sensors and airbag control unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R2021/01204—Actuation parameters of safety arrangents
    • B60R2021/01211—Expansion of air bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R2021/01311—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over monitoring the braking system, e.g. ABS
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/10—Longitudinal speed

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention discloses a method for acquiring a vehicle speed signal.A pulse signal output by a wheel speed sensor of four wheels is acquired by ABS through the wheel speed sensor, and after filtering, analysis and operation, a calculation result is converted into a wheel speed duty ratio signal/a vehicle speed digital signal. By adopting the technical scheme, the requirements of all control modules of the whole vehicle on the vehicle speed signals can be met; the repeated development of parts is avoided, the whole vehicle development period is shortened, the product development cost is reduced, and the whole vehicle cost is reduced.

Description

Method for collecting vehicle speed signal
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, various systems of the automobile have more and more demands on vehicle speed signals, the traditional fuel oil vehicle transmits digital pulse signals acquired by a speed sensor of a gearbox to a combined Instrument (ICM) through a hard wire, the combined instrument receives the pulse signals through a singlechip and combines a rear axle transmission ratio and a tire size to calculate the vehicle speed, then a stepping motor is driven to drive a pointer to rotate so as to indicate corresponding vehicle speed values, and the vehicle speed signals are converted into duty ratio signals to be transmitted to an Engine electronic control unit (Engine ECU) through the hard wire;
because the functions and the configurations of the modern automobile configuration are continuously 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) all need to be combined with a vehicle speed signal to carry out analysis operation and then realize corresponding functions and actions, and the current traditional fuel automobile state six-emission upgrading is combined, the information demand and the transmission quantity among all the modules are increased more and more, so that the number of sensors and transmission wires is increased sharply, and meanwhile, the difficulty of fault maintenance is increased.
Disclosure of Invention
The invention provides a method for acquiring a vehicle speed signal, which aims to acquire the vehicle speed signal by using a wheel speed sensor and reduce cost.
In order to achieve the above purpose, the method for acquiring the vehicle speed signal of the present invention adopts the following technical scheme:
an anti-lock braking module (ABS) collects pulse signals output by the 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 are performed.
The specific first technical scheme is as follows:
after the calculation result is converted into a wheel speed duty cycle signal by an anti-lock brake module (ABS), the wheel speed duty cycle signal is transmitted to an Engine electronic control unit (Engine ECU) by the anti-lock brake module (ABS) through a hard wire;
an Engine electronic control unit (Engine ECU) filters, analyzes and computes a wheel speed duty ratio signal input by an anti-lock brake module (ABS) and converts the computed result into a vehicle speed digital signal;
and finally, a vehicle speed digital signal is sent to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU) and an on-board diagnostic module (OBD) in a CAN message mode through a CAN, so that functions of the modules related to the vehicle speed signal are realized.
The specific second technical scheme is as follows:
after the calculation result is converted 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, so that 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, and then performs data analysis and operation through the CPU to control the ignition and oil injection adjustment of the Engine, thereby improving the power performance of the Engine and the comfort of vehicle driving.
Furthermore, on the basis of the two technical schemes, the following technical schemes are adopted respectively:
the combined Instrument (ICM) receives a vehicle speed signal to display the vehicle speed: the combined Instrument (ICM) receives the CAN message, reads the CAN message into the CPU, and then controls the analog amplifying circuit to drive the stepping motor to rotate through the CPU control port to indicate the corresponding vehicle speed value.
The vehicle Body Controller (BCM) receives a vehicle speed signal to realize automatic unlocking and locking: a vehicle Body Controller (BCM) receives the CAN message, reads in the CPU and simultaneously combines the initial unlocking and locking speed, and then 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: an electric power steering system (EPS) receives the CAN message, reads the CAN message, simultaneously combines the signals of the torque sensor to analyze and calculate, and then controls the rotation direction of the steering motor and the power-assisted current through a CPU control port.
The air bag control unit (Airbag ECU) receives a vehicle speed signal to control the air bag detonation time: an air bag control unit (Airbag ECU) receives the CAN message, reads in the CPU and simultaneously combines the acceleration signal of the collision sensor to analyze and calculate; when the air bag is required to be detonated, the CPU control port drives the air bag igniter to detonate the air bag.
The vehicle-mounted diagnosis module (OBD) performs the read-write function of the CAN message with the whole vehicle CAN network through the OBD diagnosis port, and detects the 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 collecting the wheel speed signal, and meanwhile, the strong data operation, analysis and processing capacity of the ABS/engine ECU is utilized, so that the requirements of all control modules of the whole vehicle on the speed signal can be met; the wheel speed pulse signals acquired by the ABS wheel speed sensor are converted into vehicle speed digital signals, and the vehicle speed digital signals are transmitted to each functional module in a CAN message form through a 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 development cost of the product is reduced, the cost of the whole vehicle is reduced, and the application of the parts in a platform and universalization manner is promoted.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the invention for vehicle speed signal acquisition and transmission;
fig. 2 is a schematic diagram of a second technical solution of the vehicle speed signal acquisition and transmission of the present invention.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate, and thorough understanding of the inventive concepts and aspects of the invention by those skilled in the art.
As shown in fig. 1 and 2: the invention discloses a vehicle speed signal acquisition, transmission and processing structure, which realizes a vehicle speed signal acquisition method, wherein an engine ECU analyzes, processes and calculates the vehicle speed and transmits the vehicle speed to ICM, EPS, BCM and Airbag ECU modules in a CAN message form through a CAN chip.
In order to overcome the defects of the prior art and realize the aim of acquiring a vehicle speed signal by utilizing a wheel speed sensor and reducing the cost, the invention adopts the first technical scheme that:
as shown in fig. 1, an anti-lock brake module (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, analysis and operation;
transmitting the wheel speed duty cycle signal to an Engine electronic control unit (Engine ECU) through a hard wire;
an Engine electronic control unit (Engine ECU) filters, analyzes and computes a wheel speed duty ratio signal input by an anti-lock brake module (ABS) and converts the computed result into a vehicle speed digital signal;
and finally, a vehicle speed digital signal is sent to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU) and an on-board diagnostic module (OBD) in a CAN message mode through a CAN, so that functions of the modules related to the vehicle speed signal are realized.
In the first technical scheme, the wheel rotates, a wheel speed signal is acquired through a wheel speed sensor, a digital pulse signal is output, an ABS acquires a pulse signal output by the four-wheel speed sensor, the pulse signal is filtered, analyzed and calculated, then the pulse signal is converted into a duty ratio signal, the duty ratio signal is transmitted to an engine ECU through a hard wire, the engine ECU acquires, filters, analyzes and calculates the input duty ratio signal and converts the calculation result into a digital signal, finally the converted digital signal is transmitted to each module through a CAN (controller area network) chip in a CAN (controller area network) message form to realize various functions, a combination instrument ICM receives a vehicle speed signal for vehicle speed display, an EPS receives the vehicle speed signal for torque control, an BCM receives the vehicle speed signal for automatic unlocking and locking, and an Airbag ECU receives the vehicle speed signal for controlling the air bag detonation time, and simultaneously meets the requirements of each module and an OBD (on-board) diagnosis.
The Engine electronic control unit (Engine ECU): storing a rear axle transmission ratio parameter, a wheel radius parameter and a tire rotation speed parameter corresponding to a duty ratio in an Engine ECU; the Engine ECU acquires ABS input duty cycle signals, filters the ABS input duty cycle signals and inputs the ABS input duty cycle signals to the ECU processor, and the processor calculates the current real-time vehicle speed through a vehicle speed calculation function by combining a rear axle transmission ratio, wheel radius parameters and a tire rotation speed list corresponding to the duty cycle, and sends the current real-time vehicle speed to a combination Instrument (ICM), an electric power steering module (EPS), a vehicle Body Control Module (BCM) and an air bag control module (Airbag ECU) in a CAN message mode through a CAN chip.
The second technical scheme adopted by the invention is as follows:
as shown in fig. 2, an anti-lock brake module (ABS) collects pulse signals output by wheel speed sensors of four wheels through the wheel speed sensors, and converts calculation results into vehicle speed digital signals after filtering, analysis and calculation; and finally, a vehicle speed digital signal is sent 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, so that 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, and then performs data analysis and operation through the CPU to control the ignition and oil injection adjustment of the Engine, thereby improving the power performance of the Engine and the comfort of vehicle driving.
In the second technical scheme, the wheel rotation acquires a wheel speed signal through a wheel speed sensor, outputs a digital pulse signal, and the pulse signal output by the ABS acquires the four-wheel speed sensor is filtered, analyzed and calculated and then converted into a vehicle speed digital signal; and finally, the converted digital signals are sent to each module in a CAN message form through a CAN chip to realize various functions, the combination instrument receives the vehicle speed signals to display the vehicle speed, the EPS receives the vehicle speed signals to realize torque control, the BCM receives the vehicle speed signals to realize automatic unlocking and locking, and the Airbag ECU receives the vehicle speed signals to control the air bag to detonate, so that the requirements of each module and OBD diagnosis are met.
The specific functions of each module in the invention are as follows:
the Wheel Speed Sensor (WSS): the rear axle drives the wheels to rotate, gears on the front axle and the rear axle cut four-wheel WSS magnetic induction lines through an electromagnetic induction principle, and four-wheel digital pulse signal output is generated and transmitted to the ABS through hard wires.
The anti-lock braking module (ABS) comprises: the ABS acquires 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 amplifying motor to drive the ABS valve body and the motor to act through the control port through analysis and operation, so that the ABS anti-lock function is realized, and meanwhile, the processor calculates and converts the digital pulse signals input by the four-wheel WSS into duty ratio signals and transmits the duty ratio signals to the Engine ECU through a hard wire.
The combined Instrument (ICM) receives a vehicle speed signal to display the vehicle speed: the combined Instrument (ICM) receives the CAN message, reads the CAN message into the CPU, and then controls the analog amplifying circuit to drive the stepping motor to rotate through the CPU control port to indicate the corresponding vehicle speed value.
The vehicle Body Controller (BCM) receives a vehicle speed signal to realize automatic unlocking and locking: a vehicle Body Controller (BCM) receives the CAN message, reads in the CPU and simultaneously combines the initial unlocking and locking speed, and then 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: an electric power steering system (EPS) receives the CAN message, reads the CAN message, simultaneously combines the signals of the torque sensor to analyze and calculate, and then controls the rotation direction of the steering motor and the power-assisted current through a CPU control port.
The air bag control unit (Airbag ECU) receives a vehicle speed signal to control the air bag detonation time: an air bag control unit (Airbag ECU) receives the CAN message, reads in the CPU and simultaneously combines the acceleration signal of the collision sensor to analyze and calculate; when the air bag is required to be detonated, the CPU control port drives the air bag igniter to detonate the air bag.
The vehicle-mounted diagnosis module (OBD) performs the read-write function of the CAN message with the whole vehicle CAN network through the OBD diagnosis port, and detects the vehicle speed signal so as to achieve the purposes of real-time dynamic data reading, fault diagnosis, fault maintenance and fault clearing.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is capable of being modified or applied directly to other applications without modification, as long as various insubstantial modifications of the method concept and technical solution of the invention are adopted, all within the scope of the invention.

Claims (2)

1. The acquisition method of the vehicle speed signal, the anti-lock braking module (ABS) collects the pulse signal outputted by the wheel speed sensor of four wheels through the wheel speed sensor, and after filtering, analyzing and calculating, the calculation result is converted into a wheel speed duty ratio signal/a vehicle speed digital signal;
after the calculation result is converted into a wheel speed duty ratio signal by the anti-lock brake module (ABS), the wheel speed duty ratio signal is transmitted to an Engine electronic control unit (Engine ECU) by the anti-lock brake module (ABS) through a hard wire;
an Engine electronic control unit (Engine ECU) filters, analyzes and computes a wheel speed duty ratio signal input by an anti-lock brake module (ABS) and converts the computed result into a vehicle speed digital signal;
finally, a vehicle speed digital signal is sent to a combination Instrument (ICM), a vehicle Body Controller (BCM), an electric power steering system (EPS), an air bag control unit (Airbag ECU) and an on-board diagnostic module (OBD) in a CAN message mode through a CAN, so that functions of the modules related to the vehicle speed signal are realized;
the combined Instrument (ICM) receives a vehicle speed signal to display the vehicle speed: the combined Instrument (ICM) receives the CAN message, reads in a CPU of the combined instrument, and controls the analog amplifying circuit to drive the stepping motor to rotate through a CPU control port of the combined instrument to indicate a corresponding vehicle speed value;
the vehicle Body Controller (BCM) receives a vehicle speed signal to realize automatic unlocking and locking: a vehicle Body Controller (BCM) receives the CAN message, reads in a CPU of the vehicle body controller, combines the initial set unlocking speed, and controls the automatic unlocking and locking actions of the four-door lock through a CPU control port of the vehicle body controller so as to finish 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: an electric power steering system (EPS) receives the CAN message, reads in a CPU of the electric power steering system, simultaneously analyzes and calculates by combining signals of a torque sensor, and controls the rotation direction and the power-assisted current of a steering motor through a CPU control port of the electric power steering system;
the air bag control unit (Airbag ECU) receives a vehicle speed signal to control the air bag detonation time: an air bag control unit (Airbag ECU) receives the CAN message, reads in the CPU of the air bag control unit, and simultaneously combines the acceleration signal of the collision sensor to perform analysis and calculation; when the air bag is required to be detonated, driving the air bag igniter to detonate the air bag through a CPU control port of the air bag control unit;
the vehicle-mounted diagnosis module (OBD) performs the read-write function of the CAN message with the whole vehicle CAN network through the OBD diagnosis port, and detects the vehicle speed signal so as to achieve the purposes of real-time dynamic data reading, fault diagnosis, fault maintenance and fault clearing.
2. The acquisition method of the vehicle speed signal, the anti-lock braking module (ABS) collects the pulse signal outputted by the wheel speed sensor of four wheels through the wheel speed sensor, and after filtering, analyzing and calculating, the calculation result is converted into a wheel speed duty ratio signal/a vehicle speed digital signal;
after the calculation result is converted into a wheel speed duty cycle 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 a vehicle-mounted diagnostic module (OBD) in a CAN message form through a CAN, so that the functions of the modules related to the vehicle speed signal are realized;
the combined Instrument (ICM) receives a vehicle speed signal to display the vehicle speed: the combined Instrument (ICM) receives the CAN message, reads in a CPU of the combined instrument, and controls the analog amplifying circuit to drive the stepping motor to rotate through a CPU control port of the combined instrument to indicate a corresponding vehicle speed value;
the vehicle Body Controller (BCM) receives a vehicle speed signal to realize automatic unlocking and locking: a vehicle Body Controller (BCM) receives the CAN message, reads in a CPU of the vehicle body controller, combines the initial set unlocking speed, and controls the automatic unlocking and locking actions of the four-door lock through a CPU control port of the vehicle body controller so as to finish 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: an electric power steering system (EPS) receives the CAN message, reads in a CPU of the electric power steering system, simultaneously analyzes and calculates by combining signals of a torque sensor, and controls the rotation direction and the power-assisted current of a steering motor through a CPU control port of the electric power steering system;
the air bag control unit (Airbag ECU) receives a vehicle speed signal to control the air bag detonation time: an air bag control unit (Airbag ECU) receives the CAN message, reads in the CPU of the air bag control unit, and simultaneously combines the acceleration signal of the collision sensor to perform analysis and calculation; when the air bag is required to be detonated, driving the air bag igniter to detonate the air bag through a CPU control port of the air bag control unit;
the vehicle-mounted diagnosis module (OBD) performs a read-write function of a CAN message 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 Engine electronic control unit (Engine ECU) receives the CAN message, reads the CAN message into the CPU of the Engine electronic control unit, and then performs data analysis and operation through the CPU of the Engine electronic control unit to control the ignition and oil injection adjustment of the Engine, thereby improving the power performance of the Engine and the comfort of vehicle driving.
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