Drive Unit Torque Control for Hill Start Hold on Steep Inclines
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Solution Overview
Problem
Existing hill start/stall assist systems in vehicles struggle to maintain vehicle position on steep inclines, requiring drivers to coordinate clutch, brake, and accelerator pedals effectively to prevent rolling back or forward.
Innovation Solution
A drive unit controller system that includes components to receive zero-speed commands and electric motor information, generate torque commands, and instruct a drive unit inverter to control electric motors, ensuring the vehicle maintains position by adjusting torque based on vehicle status, brake information, and acceleration pedal input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If automatic braking or engine torque control is used to maintain hill hold condition, then vehicle position stability is improved, but driver operation complexity increases due to coordination requirements
Solution Approach 1:
The system automatically detects hill start conditions and applies braking force without driver intervention. The controller monitors vehicle status, brake information, and acceleration pedal input to determine when hill start assist is needed, then autonomously controls the brake system to prevent rolling, eliminating the need for driver coordination of multiple pedals
Solution Approach 2:
The patent replaces manual mechanical coordination of clutch, brake, and accelerator pedals with an electronic control system that uses sensors, a controller, and automated brake actuation. This substitution of mechanical driver coordination with an electronic control system resolves the contradiction by maintaining stability while simplifying operation
2Measurement precision
If torque commands are generated based on multiple inputs (zero-speed command, motor information, brake information, acceleration pedal input), then control precision is improved, but device complexity increases
Solution Approach 1:
The controller integrates multiple functions into a single device: it receives zero-speed commands, processes electric motor information, generates torque commands, and coordinates with the brake system. This multi-functional controller reduces overall system complexity by consolidating control functions while maintaining precise torque control through comprehensive input processing
Solution Approach 2:
The system continuously monitors vehicle status information, brake information, and acceleration pedal input to dynamically adjust torque commands. This feedback mechanism enables precise control by constantly comparing actual conditions with desired states and making real-time adjustments, achieving high control precision without requiring overly complex hardware
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
The system effectively maintains the vehicle's position on steep inclines by generating appropriate torque commands, allowing the driver to start the vehicle without worrying about rolling, until the acceleration pedal is depressed beyond a threshold.
Implementation Method 1
A drive unit controller includes a first component that is configured to receive a zero-speed command and electric motor information and a second component that is configured to generate a torque command based on the received zero-speed command and the electric motor information
Data Source
AI summary
Various disclosed embodiments include illustrative systems for performing hill stall/start assist functions. An illustrative drive unit controller receives a zero-speed command and electric motor information, generates a torque command based on the received zero-speed command and the electric motor information, and instructs a drive unit inverter for an electric motor in response to the generated torque command.