A wireless communication-based automobile steering system

Abstract

The utility model discloses a kind of automobile steering system based on wireless communication, the steering wheel sensor of automobile steering system is connected and communicates with electric power steering controller by wiring harness, the electric power steering controller connects steering actuator, the electric power steering controller is communicated with central gateway controller by wireless communication, the central gateway controller, the central gateway controller is connected with relevant system controller by wiring harness.The utility model solves the constraint between electric power steering controller by wiring harness, receives and generates the signal related to steering system by the strategy of wireless communication, does not carry out communication between controller by cable, simplifies the quantity of connection point structure, reduces the risk of connector failure, short-distance data transmission is flexible and convenient, and environmental adaptability is good.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering technology, specifically to wireless communication technology for automotive electric power steering systems. Background Technology

[0002] Electric power steering is an important component of a car. When the car is turning, the torque sensor detects the torque of the steering wheel and the intended direction of rotation. These signals are sent to the electronic control unit (ECU) via a data bus. The ECU, based on the steering wheel torque, intended direction of rotation, and vehicle speed, sends a command to the electric motor controller. The electric motor then outputs the appropriate amount of torque to provide power assistance. When the car is not turning, the ECU does not send commands to the electric motor controller, and the system remains in a dormant state, awaiting activation.

[0003] Meanwhile, the electronic control unit (ECU) determines the force applied to the steering wheel based on the vehicle speed signal, reducing the "floaty" feeling of the steering wheel at high speeds. When the steering wheel is operated, a torque sensor mounted on the steering wheel shaft continuously measures the torque on the steering shaft and generates a voltage signal. This signal, along with the vehicle speed signal, is input to the ECU. The microcomputer in the ECU processes these input signals to determine the magnitude and direction of the assist torque, i.e., selecting the current / voltage and steering direction of the electric motor, and adjusting the steering assist power. Currently, the system's control strategy transmits relevant signals through wiring harnesses. These signals include the steering system's own hand force, torque, steering wheel angle, voltage, and current, as well as vehicle speed, host signal, engine speed, and signals required by the automatic driving controller. These signals are transmitted to the electric steering system controller via a CAN communication bus or LIN serial bus. The wiring harness is connected between the associated controllers via connectors; without the wiring harness connection, the electric steering system controller cannot receive or send any signals.

[0004] Currently, conventional steering systems all use wiring harnesses to transmit signals. For example, the patent document CN 107031713A, published on August 11, 2017, entitled "A Steering Control Circuit for an Electric Vehicle," discloses an electric vehicle steering control circuit including a battery pack, a first relay, a steering control module, an energy storage module, and a delay control module. The positive terminal of the battery pack is connected to the steering control module and the energy storage module through the first relay, and the negative terminal of the battery pack is also connected to the steering control module and the energy storage module. The delay control module is connected to the first relay and the steering control module and receives the ON enable signal and the status signal of the high-voltage main contactor. Because wiring harnesses are flexible components, their assembly is difficult, labor-intensive, and time-consuming, hindering future automated and intelligent production. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to realize a solution to the constraints between the wiring harness and the controller of the electric power steering system, reduce the difficulty of production wiring, and make the automotive steering system safe and reliable.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a car steering system based on wireless communication, wherein the steering wheel sensor of the car steering system is connected and communicates with the electric power steering controller via a wiring harness, the electric power steering controller is connected to the steering actuator, the electric power steering controller communicates with the central gateway controller via wireless communication, and the central gateway controller is connected to the relevant system controller via a wiring harness.

[0007] The electric power steering controller and the central gateway controller are connected by a matching Bluetooth module, which includes a receiving module and a transmitting module.

[0008] Both the electric power steering controller and the central gateway controller are equipped with two Bluetooth modules: one is the main Bluetooth module, and the other is the backup Bluetooth module.

[0009] The electric power steering controller receives torque and angle signals from the steering system via a steering wheel sensor and a wiring harness. The electric power steering controller also receives vehicle parameter information collected from relevant system controllers by the vehicle's central gateway controller via wireless communication.

[0010] The relevant system controller includes a vehicle speed sensor and an intelligent driving module.

[0011] The relevant system controller sends the relevant steering request signal to the vehicle's central gateway controller via a wiring harness.

[0012] The electric power steering controller drives the electric steering actuator to enable the vehicle to perform basic steering functions.

[0013] This invention solves the constraints imposed by wiring harnesses on the controllers of the electric power steering system. It receives and generates steering system-related signals through wireless communication, eliminating the need for cables to communicate between controllers. This simplifies the number of connection points, reduces the risk of connector failure, provides flexible and convenient short-distance data transmission, and offers good environmental adaptability. Attached Figure Description

[0014] The following is a brief explanation of the content represented by each of the accompanying drawings in this utility model specification:

[0015] Figure 1 This is a schematic diagram illustrating the principle of wireless communication.

[0016] Figure 2A schematic diagram of an electric power steering system for automobiles with wireless communication. Detailed Implementation

[0017] The following description, with reference to the accompanying drawings, details the specific implementation of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the function and working principle of each part, the manufacturing process, and the operation and use methods. This will help those skilled in the art to have a more complete, accurate, and in-depth understanding of the inventive concept and technical solution of this utility model.

[0018] The wireless communication electric power steering system is an improvement on the existing steering system. The wireless communication electric power steering system is implemented by an electric power steering controller, steering wheel sensor, electric steering actuator, wireless transmission equipment, and vehicle central gateway controller.

[0019] The electric power steering controller integrates an electric power steering motor and receives steering wheel sensor signals via a wiring harness;

[0020] An electric steering actuator is a structure that connects to the car's tires and steers the vehicle via an electric power steering controller;

[0021] The electric power steering controller transmits and receives signals with the vehicle's central gateway via wireless communication.

[0022] Wireless communication refers to a communication method that uses only electromagnetic waves without cables. Bluetooth modules are preferred, meaning that a matching Bluetooth module is provided between the electric power steering controller and the central gateway controller. The Bluetooth module consists of a receiving module and a transmitting module. The wireless communication method is to transmit and receive relevant signals through the high-speed Bluetooth module. The high-speed Bluetooth module is a two-way communication module that is provided in both the electric power steering controller and the vehicle's central gateway controller.

[0023] Because the steering system is the most important control component in a vehicle, a redundant design is adopted to ensure its safety. That is, both the electric power steering controller and the central gateway controller are equipped with two Bluetooth modules, one as the main Bluetooth module and the other as the backup Bluetooth module. Each time it starts, it performs a self-test. When both the main Bluetooth module and the backup Bluetooth module are working properly, they communicate with each other using the main Bluetooth module. When either the main Bluetooth module or the backup Bluetooth module fails, an alarm is triggered, and the working Bluetooth module is used for communication.

[0024] All controllers are powered by the car's battery.

[0025] like Figure 1As shown, the controller's built-in high-speed Bluetooth communication module consists of a transmitting device and a receiving device. The transmitting device converts the original signal source into a signal suitable for electromagnetic wave transmission, adding a low-frequency signal to a high-frequency carrier signal. A frequency converter further converts the signal into the frequency required for transmission. The receiving device restores the received signal to its original information and sends it to the receiving end. The receiving device amplifies the received radio frequency carrier signal, performs frequency conversion, and finally demodulates it to recover the original information, thus completing wireless communication.

[0026] When a car needs the electric power steering system to provide basic assistance, the electric power steering controller receives torque and angle signals from the steering system via the steering wheel sensor and the wiring harness. On the other hand, it receives the vehicle speed signal from the relevant system controller 5 from the car's central gateway controller via Bluetooth. In this way, it determines the steering assistance required under the corresponding vehicle operating conditions and drives the electric power steering actuator to enable the car to perform basic steering functions.

[0027] When a car needs to implement intelligent driving functions, the relevant system controller sends the relevant steering request signal to the car's central gateway controller through the wiring harness. The car's central gateway controller then sends and receives relevant signals with the electric power steering controller via Bluetooth module, and then feeds back to the relevant system controller. The electric power steering controller determines the steering actuator to perform the appropriate action based on the relevant signals, enabling the car to implement intelligent driving functions.

[0028] Currently, based on the different functional requirements of the steering system in different driving scenarios, it can be divided into basic power steering scenarios and intelligent driving-related steering scenarios. When implementing the basic power steering function, the electric power steering controller receives steering system signals through the steering wheel sensor and vehicle speed signals from the central gateway via Bluetooth. This determines the steering assistance under the corresponding vehicle operating conditions and drives the electric steering actuator to perform the corresponding action. When the vehicle needs to implement intelligent driving functions, the intelligent driving-related controller sends the relevant steering request signal to the central gateway controller via the wiring harness. The central gateway controller then communicates with the electric power steering controller via Bluetooth and feeds back to the intelligent driving-related controller. The electric power steering controller determines the appropriate action for the electric steering actuator based on the relevant signals.

[0029] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A wireless communication-based automotive steering system, wherein a steering wheel sensor of the automotive steering system is connected and communicates with an electric power steering controller via a wiring harness, and the electric power steering controller is connected to a steering actuator, characterized in that: The electric power steering controller communicates with the central gateway controller via wireless communication. The central gateway controller is connected to the relevant system controller via a wiring harness.

2. The automotive steering system based on wireless communication according to claim 1, characterized in that: A matching Bluetooth module is provided between the electric power steering controller and the central gateway controller. The Bluetooth module includes a receiving module and a transmitting module.

3. The automotive steering system based on wireless communication according to claim 2, characterized in that: Both the electric power steering controller and the central gateway controller are equipped with two Bluetooth modules: one is the main Bluetooth module, and the other is the backup Bluetooth module.

4. The automotive steering system based on wireless communication according to claim 1, 2, or 3, characterized in that: The electric power steering controller receives torque and angle signals from the steering system via a steering wheel sensor and a wiring harness. The electric power steering controller also receives vehicle parameter information collected from relevant system controllers by the vehicle's central gateway controller via wireless communication.

5. The automotive steering system based on wireless communication according to claim 4, characterized in that: The relevant system controller includes a vehicle speed sensor and an intelligent driving module.

6. The automotive steering system based on wireless communication according to claim 5, characterized in that: The relevant system controller sends the relevant steering request signal to the vehicle's central gateway controller via a wiring harness.

7. The automotive steering system based on wireless communication according to claim 6, characterized in that: The electric power steering controller drives the electric steering actuator to enable the vehicle to perform basic steering functions.

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