Vehicle Driving Force Control Using Pitch-Frequency Compensation
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Solution Overview
Problem
Existing pitch motion control techniques in vehicles cause time delays in acceleration response when attempting to prevent overshoot during sudden acceleration, making them ineffective.
Innovation Solution
A driving force control apparatus that utilizes a filter with a natural frequency of the vehicle as a center frequency to remove pitch components from the required driving force, adjusting parameters based on vehicle speed and driver inputs to generate a compensation driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If low pass filtering processing is used to gradually increase or limit the driving force, then pitch motion is suppressed, but acceleration response time is delayed
Solution Approach 1:
The patent changes the filtering parameters by using a second-order filter with specifically designed damping ratio and natural frequency parameters. This allows selective attenuation of pitch motion frequencies while preserving acceleration response, resolving the contradiction between pitch suppression and response time.
Solution Approach 2:
The patent implements dynamic adjustment of filter parameters based on vehicle operating conditions. The damping ratio and natural frequency are adjusted according to vehicle speed and acceleration state, enabling the system to maintain optimal performance across different driving scenarios and prevent both pitch motion and response delay.
2Speed
If driving force is suddenly increased to respond to driver acceleration request, then acceleration performance is improved, but pitch motion overshoot occurs
Solution Approach 1:
The patent applies preliminary filtering to the required driving force before it is executed. By processing the driver's acceleration request through a second-order filter in advance, the system prepares a smoothed driving force profile that prevents pitch motion overshoot while maintaining good acceleration performance.
Solution Approach 2:
The patent uses feedback from vehicle state sensors (acceleration, speed, pitch angle) to continuously adjust the filter parameters and driving force output. This closed-loop control ensures that acceleration performance is maintained while pitch motion is actively suppressed in real-time.
Data Source
AI summary
A driving force control apparatus includes a sensor that collects information associated with a state of a vehicle, a driving device that provides a driving force to a drive wheel of the vehicle, and a processor electrically connected to the sensor and the driving device, wherein the processor is configured to determine a required driving force of a driver based on at least a part of the information collected by the sensor, when the vehicle accelerates, determines a compensation driving force where a pitch component is removed from the required driving force using a filter which utilizes a natural frequency of the vehicle as a center frequency, and controls the driving device based on the determined compensation driving force.