Automobile steering wheel off-hand detection system and method

Abstract

The embodiment of the invention discloses an automobile steering wheel off-hand detection system and method. The system comprises a capacitive sensor based on IQ modulation and a microcontroller, the capacitive sensor comprises a plurality of detection channels, the detection channels are connected to a steering wheel heating wire, and the data output end of the capacitive sensor is connected to the microcontroller. The capacitive sensor detects the capacitance value of the steering wheel heating wire through the detection channel and generates capacitance detection data, the microcontroller reads the capacitance detection data, and the microcontroller determines a steering wheel off-hand detection result according to the capacitance detection data and the capacitance reference data. Through the technical means, the influence of environment temperature change on the off-hand detection precision is eliminated, and the detection accuracy and reliability are improved.

Description

technical field [0001] The embodiments of the present application relate to the technical field of automobiles, and in particular to a system and method for detecting hands-off steering wheel of an automobile. Background technique [0002] With the development of science and technology, as an important part of the steering system of a car, the steering wheel is not only a steering part, but also has more functions, such as audio control, cruise control, Bluetooth, and driving computer. The steering wheel is realized. [0003] HOD (Hand Off Detection) is a type of ADAS (Advanced Driving Assistance System, Advanced Driving Assistance System), and it is also a requirement for L1-L4 autopilot systems. HOD is gradually being valued by more and more OEMs. At present, the HOD system mainly uses IQ-modulated capacitive sensor chips, but the capacitive sensor is easily affected by the ambient temperature. If the data processing algorithm is not reasonable enough, the HOD system is ...

AI Technical Summary

Problems solved by technology

At present, the HOD system mainly uses the capacitive sensor chip with IQ modulation, but the capacitive sensor is easily affected by the ambient temperature. If the data processing algorithm is not reasonable enough, the HOD system is not accurate enough to judge the current state of the driver, which is prone to misjudgment

In addition, the current HOD system on the market uses the HOD data measured after power-on as the benchmark data, but if the driver has put his hands on the steering wheel before the vehicle starts, the HOD data measured after power-on will be lower than The normal baseline data is high, so it will cause deviations in subsequent measurements, and the HOD system will not be able to accurately identify the current driver's state

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