Motor-Generator Torque Control for Smooth Vehicle Stops on Slopes
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Solution Overview
Problem
Existing vehicles face challenges in smoothly stopping on slopes due to gradient and weight factors, leading to potential shocks and discomfort for occupants when using motor-generator braking force.
Innovation Solution
A control apparatus that calculates and applies offset torque to vehicle wheels using a motor-generator in a regenerative mode, causing the output torque to asymptotically approach the required compensation torque for stable stopping on sloping roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If motor-generator braking force is applied to stop the vehicle on a sloping road, then the vehicle can be stopped, but shocks and discomfort occur for occupants
Solution Approach 1:
The motor-generator torque is dynamically adjusted to asymptotically approach the offset torque required for slope compensation. This dynamic control allows the torque to gradually increase rather than applying suddenly, preventing shocks to occupants while achieving the necessary stopping force on sloping roads.
Solution Approach 2:
The control apparatus changes the torque parameter of the motor-generator over time, transitioning from initial torque to offset torque asymptotically. This parameter change strategy ensures smooth torque application that compensates for gravitational forces on slopes without causing harmful shocks to the vehicle occupants.
2Stability of the object's composition
If offset torque is applied to stop the vehicle on a sloping road, then the vehicle can be held stationary, but the control complexity increases
Solution Approach 1:
The control apparatus uses feedback control to asymptotically adjust the motor-generator torque toward the calculated offset torque. This feedback mechanism automatically maintains the vehicle in a stable stopped state on sloping roads without requiring complex manual intervention or overly complicated control systems.
Solution Approach 2:
The control system automatically calculates and applies the necessary offset torque based on vehicle parameters and slope conditions. The system serves itself by autonomously managing the torque asymptotically approach process, eliminating the need for additional complex control mechanisms while ensuring stable stopping on slopes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables vehicles to stop smoothly on slopes by preventing shocks and maintaining a stable stopped state, ensuring safe and comfortable vehicle operation.
Implementation Method 1
a motor-generator configured to apply braking force to the vehicle in a regenerative mode
Data Source
AI summary
A control apparatus for a vehicle includes an offset torque calculator configured to perform calculation of offset torque to be applied to at least one wheel of the vehicle. The offset torque is required to stop the vehicle on a sloping road having a predetermined gradient. The control apparatus includes a motor controller configured to, for stopping the vehicle on the sloping road having the predetermined gradient, perform control of causing output torque of the motor-generator to asymptotically approach the offset torque.