Electric Vehicle Motor Position and Creep Control
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Solution Overview
Problem
Electric vehicles lack a creep function similar to gasoline engine vehicles, leading to issues with preventing backward rolling on slopes, as they do not generate idle torque, requiring complex calculations of motor torque based on variables like slope angle and passenger load to maintain position.
Innovation Solution
An apparatus and method for controlling motor position and creep in electric vehicles, which includes a motor position determiner, motor position controller, and creep torque controller, performing backlash compensation, motor position stabilization, and creep torque control to maintain the vehicle's position without brake or accelerator pedal operation, regardless of slope angle or passenger changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If motor torque is increased to prevent backward rolling on slopes, then vehicle position stability is improved, but device complexity increases due to complex calculations required for slope angle and passenger load
Solution Approach 1:
The system performs preliminary detection of slope angle and passenger load conditions, and pre-calculates the required motor torque before the vehicle actually starts moving. This allows the control system to be prepared in advance with the appropriate torque values, eliminating the need for complex real-time calculations during critical moments of vehicle启动
Solution Approach 2:
The system continuously monitors vehicle position, slope angle, and operational conditions, using this feedback to dynamically adjust motor torque. Sensors detect actual vehicle behavior and feed this information back to the controller, which automatically compensates for position deviations and maintains stability on slopes without requiring complex manual calculations
2Ease of operation
If creep torque control is implemented to maintain vehicle position, then ease of operation is improved, but manufacturing precision requirements increase for accurate torque control
Solution Approach 1:
The system changes torque control parameters dynamically based on detected conditions such as slope angle and vehicle state. Instead of using a fixed torque value, the controller adjusts torque parameters in real-time according to the operational context, achieving both ease of operation and adequate control precision without requiring extremely tight manufacturing tolerances
Solution Approach 2:
The creep torque control system transitions from static to dynamic operation, where torque values are continuously adjusted based on real-time sensor feedback about vehicle position and environmental conditions. This dynamic adaptation allows the system to maintain precision across varying operating conditions without requiring excessive manufacturing precision in the hardware
Data Source
AI summary
The present invention provides an apparatus and method for controlling motor position and creep of an electric vehicle, in which when a running vehicle is stopped, motor position control for maintaining the vehicle in the stopped position even when a brake pedal is released is performed, and then creep torque control is performed such that the vehicle is prevented from rolling backwards and suddenly starting when the vehicle is restarted after a stop on a slope.