System and method for keyless entry and start of automobiles based on communication bus

Abstract

The invention discloses an automobile keyless entry and start system and an automobile keyless entry and start method based on a communication bus. The automobile keyless entry and start method based on the communication bus comprises the following steps of recognizing whether an unlocking action exists or not through an inductive sensor by using an electronic control unit; transmitting a trigger signal to a central control unit if the unlocking action exists and transmitting an unlocking signal by using a low-frequency antenna transmitter within an effective transmitting range of the low-frequency antenna transmitter; transmitting a personal information signal by using a radio frequency transmitter within an effective transmitting range of the radio frequency transmitter after a low-frequency antenna receiver in an intelligent key receives the unlocking signal transmitted by the electronic control unit; detecting whether the radio frequency transmitter receives the personal information signal which is transmitted from the intelligent key or not after the central control unit receives the triggering signal transmitted from the electronic control unit; analyzing whether personal information is legal or not; and processing an engine unlocking and starting command transmitted by a chip if the personal information is legal. The automobile keyless entry and start system and the automobile keyless entry and start method based on the communication bus are low in energy consumption, convenient and reliable to operate and wide in application range.

Description

technical field [0001] The invention relates to the field of automotive electronic systems, in particular to a system and method for keyless entry and start of an automobile based on a communication bus. Background technique [0002] The existing car start control mainly adopts two modes of mechanical lock knob and remote control start. [0003] The mechanical lock knob control mode sets different gears, connects different switches and controls different relays through different internal mechanical connections and wiring harnesses, thereby controlling different power targets. For the current mechanical locks, the biggest advantage is that they are simple and reliable, but they cannot achieve the purpose of intelligent control, especially cannot meet people's requirements for comfort, for example, they cannot remotely control the start of the vehicle. [0004] In the remote control start mode, a remote control key is usually equipped with a lock / unlock button. When the user ...

AI Technical Summary

Problems solved by technology

For the current mechanical lock, the biggest advantage lies in its simplicity and reliability, but it cannot achieve the purpose of intelligent control, especially the comfort requirements of people, such as the remote control of the start of the vehicle.

[0004] In the remote control start mode, a remote control key is usually equipped with a lock / unlock button. When the user needs to unlock the vehicle, the user needs to point the remote control key at the vehicle and press the up The lock / unlock button is used to unlock the vehicle and start the engine. When the remote control start mode is used to control the entry and start of the car, the control chip and the radio frequency receiving circuit are integrated together, which is inconvenient for management and debugging, and , the control chip and the RF receiving circuit are often located inside the car. When the remote control key communicates with the control chip and the RF receiving circuit, affected by the complex electrical environment inside the car, the low-frequency signal is often easily distorted. Sometimes the user may need to press the lock several times. The / unlock button can complete the operation of unlocking the vehicle and starting the engine. The operation is not very smooth, which affects the user experience. In addition, the control chip and the radio frequency receiving circuit are always in the state of waiting to receive the information sent by the remote control key, while the control chip The remote control start system is the device with the highest power consumption, and its control chip is always in the working state, which will lead to high energy consumption of the remote control start system

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