One-Pedal Drive Torque Control for Stable Speed on Road Grades
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Solution Overview
Problem
Existing vehicle torque control systems fail to effectively compensate for gravitational resistance on non-flat road grades, leading to inconsistent vehicle speed and driver experience.
Innovation Solution
A vehicle torque control system that includes a controller programmed to command a torque with a gravitational-offset component to the powerplant, where the torque is adjusted based on the driver-demanded wheel torque and the resistance torque corresponding to gravitational resistance, ensuring the gravitational-offset component converges towards zero as the accelerator pedal position increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If gravitational compensation torque is applied to maintain constant speed on uphill grades, then vehicle speed stability is improved, but driver-demanded torque effectiveness deteriorates
Solution Approach 1:
The patent applies partial gravitational compensation rather than full compensation. The controller commands torque to mitigate gravitational resistance but allows some gravitational effect to remain, particularly when accelerator pedal position indicates strong driver acceleration demand. This partial action approach maintains speed stability on grades while preserving driver intent and torque effectiveness.
Solution Approach 2:
The gravitational compensation torque is dynamically adjusted based on accelerator pedal position. As pedal position increases, the compensation torque converges toward zero, allowing the system to adapt between maintaining speed stability at low pedal positions and preserving driver-demanded torque effectiveness at high pedal positions.
2Stability of the object's composition
If gravitational compensation is applied at low accelerator pedal positions, then speed maintenance on grades is improved, but driver intent recognition deteriorates
Solution Approach 1:
The system continuously monitors accelerator pedal position and uses this feedback to adjust the gravitational compensation torque. When pedal position indicates strong acceleration demand, the compensation is reduced or eliminated, preserving driver intent information. When pedal position is low, full compensation is applied for speed maintenance.
Data Source
AI summary
A vehicle includes a powerplant, an accelerator pedal, a sensor associated with the accelerator pedal and configured to output data indicative of accelerator pedal position, and a controller. The controller is programmed to command a torque that includes a gravitational-offset component to the powerplant when the vehicle is on non-flat road grade, wherein the torque is commanded such that the gravitational-offset component converges towards zero as the accelerator pedal position increases.