Vehicle Load Distribution Recognition via Pitch Angle Estimation
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Solution Overview
Problem
Existing methods for vehicle load distribution identification require complex calculations and are limited in application range due to the lack of apparent resonance characteristics in rear wheels of front-wheel-drive vehicles, necessitating costly sensor installations.
Innovation Solution
A method that calculates vehicle load distribution by estimating the pitch angle using actual driving force, vehicle speed, and suspension stiffness without the need for load or body height sensors, utilizing equations to determine front and rear axle loads based on pitch angle changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resonance spectrum characteristics are used to identify load distribution, then load distribution can be estimated without sensors, but the method requires large amount of calculation and has limited application range due to lack of resonance characteristics in rear wheels of front-wheel-drive vehicles
Solution Approach 1:
The patent changes the measurement parameter from resonance spectrum characteristics to pitch angle characteristics. By using pitch angle changes during vehicle acceleration and deceleration, the method achieves sensorless load distribution measurement that works across all vehicle types including front-wheel-drive vehicles, eliminating the limitation of resonance characteristic availability while maintaining cost effectiveness
Solution Approach 2:
The patent replaces the complex signal processing of resonance spectrum analysis with a simpler mechanical approach based on pitch angle measurement and vehicle dynamics equations. This substitution reduces computational complexity while expanding applicability to all vehicle types through fundamental mechanical principles
2Measurement precision
If load sensors or body height sensors are installed at the suspension to measure load distribution, then accurate load distribution data can be obtained, but the installation cost increases
Solution Approach 1:
The patent enables the vehicle's existing motion parameters (acceleration, speed, pitch angle) to serve the dual purpose of both vehicle control and load distribution measurement. By using data already collected for vehicle dynamics control, the system achieves accurate load measurement without requiring additional sensors or hardware installations
Solution Approach 2:
The patent makes the vehicle's motion sensing system multi-functional by using pitch angle and acceleration data for both vehicle stability control and load distribution measurement. This universal approach eliminates the need for dedicated load sensors while maintaining measurement accuracy through mathematical modeling
Data Source
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AI summary
A vehicle and a vehicle load distribution identification method and apparatus and a medium and electronic device. The identification method includes the steps of: acquiring (S31) a speed and longitudinal acceleration of the vehicle; when the longitudinal acceleration is less than an acceleration threshold, acquiring (S32) an actual driving force of the vehicle; obtaining (S33) the actual pitch angle of the vehicle according to the actual driving force and the vehicle speed; and obtaining (S34) load distribution of the vehicle according to the actual pitch angle. With this identification method, the difference between the front and rear axle loads of the vehicle can be identified by calculating the pitch angle of the vehicle, so that the vehicle load distribution can be identified without installing dedicated sensors such as a load sensor and a vehicle body height sensor at the vehicle suspension, which reduces the cost of vehicle load distribution identification and allows a wide range of applications without being limited by the vehicle model.