Vehicle Wheel Speed Estimation Using Motor Sensor Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Typical wheel speed sensors face challenges in low-speed ranges due to reduced resolution and lack of directionality information, leading to inaccurate and delayed wheel speed detection, which affects real-time control processes in vehicles.
Innovation Solution
A system and method that incorporate a motor speed sensor and a controller to estimate wheel speed, including directionality, by using motor speed information and gear stage data to enhance the accuracy and update frequency of wheel speed measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a typical wheel speed sensor is used to detect wheel speed, then the system can obtain wheel speed information, but the resolution is reduced in low-speed ranges and direction information is lost
Solution Approach 1:
The system segments the wheel speed detection task into two parts: a wheel speed sensor provides rotation speed magnitude, while a motor speed sensor provides direction information. The controller integrates both sources to produce complete wheel speed information including direction, resolving the information loss problem.
Solution Approach 2:
The controller acts as an intermediary that receives signals from both the wheel speed sensor and motor speed sensor, processes the information, and generates accurate wheel speed estimates with directionality. This intermediary processing resolves the contradiction by combining complementary data sources.
2Speed
If a wheel speed sensor operates in low-speed range, then it can detect slow wheel rotation, but the resolution is reduced leading to inaccurate measurements
Solution Approach 1:
The system merges data from the wheel speed sensor and motor speed sensor to estimate wheel speed. The motor speed sensor provides higher resolution measurements that compensate for the wheel speed sensor's reduced resolution at low speeds, enabling accurate low-speed detection.
Solution Approach 2:
The motor speed sensor, originally designed for detecting motor rotation, is repurposed to provide wheel speed information. This multi-functional use of the motor speed sensor resolves the resolution problem in low-speed wheel detection without requiring a specialized low-speed wheel speed sensor.
3Productivity
If wheel speed information is updated at low speeds, then real-time control is possible, but the update frequency is insufficient due to reduced pulse signals
Solution Approach 1:
The system performs preliminary detection using the motor speed sensor, which operates independently of wheel speed pulse signals. This preliminary action provides continuous speed information even when wheel speed sensor pulses are insufficient, enabling timely updates for real-time control.
Solution Approach 2:
The controller uses feedback from both sensors to continuously estimate wheel speed. The motor speed sensor provides ongoing feedback that maintains update frequency during low-speed operation, while the wheel speed sensor provides feedback for accuracy validation when conditions permit.
Data Source
AI summary
A system and method for estimating a wheel speed of a vehicle are provided. The system includes wheel speed sensor that detects a rotation speed of a wheel of a vehicle and a motor speed sensor that detects a speed of the driving motor. A controller receives a signal of the wheel speed sensor, a signal of the motor speed sensor, and information regarding a gear stage indicating current gear stage status of the transmission, and estimates a wheel speed including direction information of wheel rotation.