Vehicle Torque Control Using Target Safety Torque During Failures
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Solution Overview
Problem
Conventional vehicle torque control systems fail to adequately manage torque limitations during failures, potentially leading to unsafe driving conditions, especially in hybrid electric vehicles, due to rapid torque reductions not intended by the driver, which can result in accidents.
Innovation Solution
A vehicle control apparatus and method that judges the driving state of a vehicle, identifies a normal power source, and calculates a target safety torque to maintain safe driving conditions by controlling torque within allowable limits, even in the presence of torque failures, using a vehicle state judgment unit, driving condition judgment unit, and vehicle control unit to manage power sources and actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque monitoring is performed to detect power source failures, then vehicle safety is improved, but rapid torque reduction occurs in dangerous situations causing accidents
Solution Approach 1:
The system pre-stores multiple torque limit values corresponding to different driving conditions (acceleration, constant speed, deceleration, climbing, etc.) before failure occurs. When a failure is detected, the system immediately selects and applies the appropriate pre-determined torque limit value based on the current driving condition, avoiding any delay in torque adjustment.
Solution Approach 2:
The system dynamically adjusts the torque limit value based on real-time driving conditions by categorizing them into different modes (acceleration, constant speed, deceleration, climbing). Instead of using a fixed torque limit, the system selects from multiple pre-stored torque limit values that correspond to different driving scenarios, making the torque control adaptive and context-aware.
2Stability of the object's composition
If torque is limited to a specific value during failure, then vehicle stability is improved, but driving performance deteriorates in dangerous situations
Solution Approach 1:
The system changes the torque parameter based on driving conditions by storing multiple torque limit values (first, second, third torque limit values) corresponding to different driving modes. The system selects and applies the appropriate torque limit value based on the current driving condition, thereby optimizing both stability and performance for each specific scenario.
3Device complexity
If conventional torque control is used, then system complexity is reduced, but accident risk increases in specific driving conditions
Solution Approach 1:
The system pre-stores multiple torque limit values and driving condition categories before failure occurs. When failure is detected, the system immediately selects the appropriate pre-determined torque limit based on the current driving condition, eliminating the need for complex real-time calculations and reducing response time while maintaining simplicity.
Data Source
AI summary
A vehicle control apparatus includes: a vehicle state judgment unit that judges a transverse driving control state and a longitudinal driving control state of a vehicle when detecting that a torque of a vehicle power source is abnormal, and judges a normal power source when the transverse driving control is in a normal state and the longitudinal driving control is in a failure state; a driving condition judgment unit that judges a driving state corresponding to a predetermined accident risk driving condition by using vehicle information when there is the normal power source; and a vehicle control unit that controls driving of the vehicle by using a target safety torque provided in advance when the driving state of the vehicle corresponds to the accident risk driving condition, where the vehicle is operated using the target safety torque when the driving state is the accident risk driving condition.