Traveling Motor Torque Control for Rear-End Contact Braking
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Solution Overview
Problem
Existing vehicle control systems face challenges in smoothly controlling traveling motors during rear-end contacts, as the method of gradually changing motor torque to suppress acceleration and deceleration shocks complicates control processing and may not effectively shorten the movement distance of a vehicle during such incidents.
Innovation Solution
A vehicle control apparatus that includes a torque setting unit and a motor control unit, which set a first target torque based on driver operations and a second target torque that changes more gradually, allowing the motor control unit to control the traveling motor using either torque. In case of rear-end contact, the system quickly raises the regenerative torque to apply the brake when the vehicle is stopped and gradually changes motor torque to prevent shocks when moving forward without an accelerator operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the motor torque is gradually changed to suppress acceleration and deceleration shocks, then driver comfort is improved, but the control processing becomes complicated and the movement distance during rear-end contact cannot be effectively shortened
Solution Approach 1:
The patent segments the torque control into two distinct modes: a first target torque for normal operation that provides smooth torque changes for driver comfort, and a second target torque for rear-end contact situations that enables rapid torque adjustment to shorten movement distance. The control unit selectively switches between these two torque control modes based on detected contact conditions, thereby resolving the contradiction between comfort and responsiveness.
Solution Approach 2:
The patent implements dynamic torque control by making the target torque adjustable based on operating conditions. The system dynamically switches between gradual torque changes (first target torque) for normal operation and rapid torque changes (second target torque) for rear-end contact situations. This dynamic adaptation allows the system to optimize both driver comfort during normal operation and movement distance reduction during emergency contacts.
2Ease of operation
If the motor torque is gradually changed to suppress acceleration and deceleration shocks, then driver comfort is improved, but the movement distance of the vehicle during rear-end contact cannot be effectively shortened
Solution Approach 1:
The patent segments the torque control into two distinct modes: a first target torque for normal operation that provides smooth torque changes for driver comfort, and a second target torque for rear-end contact situations that enables rapid torque adjustment to shorten movement distance. The control unit selectively switches between these two torque control modes based on detected contact conditions, thereby resolving the contradiction between comfort and responsiveness.
Solution Approach 2:
The patent implements dynamic torque control by making the target torque adjustable based on operating conditions. The system dynamically switches between gradual torque changes (first target torque) for normal operation and rapid torque changes (second target torque) for rear-end contact situations. This dynamic adaptation allows the system to optimize both driver comfort during normal operation and movement distance reduction during emergency contacts.
3Length of moving object
If the regenerative torque is quickly raised to apply brake when the vehicle is stopped, then the movement distance is shortened, but the shock suppression capability is reduced
Solution Approach 1:
The patent segments the torque control into two distinct modes: a first target torque for normal operation that provides smooth torque changes for driver comfort, and a second target torque for rear-end contact situations that enables rapid torque adjustment to shorten movement distance. The control unit selectively switches between these two torque control modes based on detected contact conditions, thereby resolving the contradiction between comfort and responsiveness.
Solution Approach 2:
The patent implements dynamic torque control by making the target torque adjustable based on operating conditions. The system dynamically switches between gradual torque changes (first target torque) for normal operation and rapid torque changes (second target torque) for rear-end contact situations. This dynamic adaptation allows the system to optimize both driver comfort during normal operation and movement distance reduction during emergency contacts.
Data Source
AI summary
A vehicle control apparatus controls a traveling motor coupled to wheels. The vehicle control apparatus includes a torque setting unit and a motor control unit. The torque setting unit sets a first target torque and a second target torque as target torques of the traveling motor. The first target torque changes based on an accelerator operation performed by a vehicle's driver. The second target torque changes more gradually than the first target torque. The motor control unit controls the traveling motor based on the first target torque or the second target torque. When the vehicle is moved forward without the accelerator operation, the torque setting unit sets the first target torque and the second target torque to a regenerative side. When the vehicle having been stopped is moved forward without the accelerator operation, the motor control unit controls the traveling motor based on the first target torque.