Vehicle Torque Control for Understeer and Oversteer Correction
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Solution Overview
Problem
Existing engine torque increasing strategies fail to distinguish between understeering and oversteering conditions, leading to inefficiencies and loss of longitudinal driving force.
Innovation Solution
A vehicle control method that determines whether the vehicle is understeering or oversteering and adjusts torque based on distinct mapping relationships for each condition, using parameters such as steering wheel angle and angular yaw velocity differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If engine torque is increased to compensate for braking torque loss, then longitudinal driving force is recovered, but internal combustion engine delay adversely affects overall vehicle performance
Solution Approach 1:
The patent replaces the mechanical internal combustion engine torque compensation system with an electric motor system. The electric motor can rapidly adjust torque without the delay inherent in internal combustion engines, thereby recovering longitudinal driving force while eliminating response time loss.
Solution Approach 2:
The patent changes the operational parameters of the electric motor (torque, power output) in real-time based on vehicle state and steering conditions. This allows rapid adaptation to compensate for braking torque loss without the inertia and delay characteristics of internal combustion engines.
2Device complexity
If a unified engine torque increasing strategy is used for both understeering and oversteering, then implementation is simple, but torque correction precision is insufficient
Solution Approach 1:
The patent segments the steering anomaly correction into two distinct control strategies: one for understeering and another for oversteering. Each strategy has its own torque adjustment mechanism, allowing precise correction tailored to the specific abnormal state while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent applies different torque adjustment characteristics to different steering conditions. For understeering, torque is adjusted according to a first mapping relationship, while for oversteering, a second mapping relationship is used. This localized optimization improves torque correction precision without requiring complete system redesign.
3Measurement precision
If braking torque is applied to correct inaccurate turning, then steering accuracy is improved, but longitudinal driving force is lost
Solution Approach 1:
The patent applies braking torque to the outer wheel to correct steering inaccuracy (improving steering accuracy), while simultaneously increasing electric motor torque to counterbalance the longitudinal force loss. The electric motor torque acts as a counterweight to offset the detrimental effect of braking, thereby maintaining both steering precision and driving force.
Data Source
AI summary
The disclosure relates to the field of vehicle technologies, and specifically, to a vehicle control method and system, a vehicle, a control apparatus, a vehicle-mounted device, and a computer-readable storage medium. The disclosure aims to solve the following technical problem: Since a distinction between understeering and oversteering conditions is not taken into consideration when increasing the engine torque, there is still room for improvement in a formulated engine torque increasing strategy. For this purpose, the disclosure provides a vehicle control method and system, a vehicle, a control apparatus, a vehicle-mounted device, and a computer-readable storage medium, where the control method includes: when an abnormal state occurs in a vehicle in a steering condition, determining whether the current abnormal state is understeering or oversteering; and adjusting torque of the vehicle based on a determining result and a torque amount adjustment mechanism predetermined for the current abnormal state. Through such settings, a feasible torque adjustment strategy can be provided for each of the understeering and oversteering conditions.