Electric Driveline Standstill Control Using Torque Prediction
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Solution Overview
Problem
Existing control systems for electric and hybrid electric vehicles at standstill are complex and expensive due to the need to monitor multiple power sources and driveline components, leading to less reliable movement control.
Innovation Solution
Implementing a standstill control system that independently monitors requested torque, clutch position, and vehicle speed, predicting torque and acceleration, and operates the vehicle in a default state when thresholds are exceeded, using a separate or integrated controller to reduce movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control system monitors torque setting of an inverter controller of an electric machine, then movement control may be achieved, but the monitoring becomes complicated and expensive
Solution Approach 1:
The patent extracts the essential control function from complex torque monitoring and implements a simplified independent control strategy that monitors only output shaft speed and derives acceleration, eliminating the need for complex torque setting monitoring while maintaining movement control reliability
Solution Approach 2:
The patent replaces expensive and complex torque monitoring systems with a simpler, more cost-effective approach using basic speed sensors and computational derivation of acceleration, reducing system cost and complexity while achieving the same control objective
2Adaptability or versatility
If multiple power sources (battery system and combustion engine) are accommodated, then power flexibility is improved, but control reliability decreases due to signal complexity
Solution Approach 1:
The patent segments the control function into independent modules: one for monitoring driveline components and another for controlling vehicle movement. This independent control architecture processes signals separately for each function, preventing signal interference between multiple power sources and improving overall control reliability
Solution Approach 2:
The patent introduces an independent control system that acts as an intermediary between the multiple power sources and the vehicle movement. This separate control pathway processes acceleration and speed signals independently, ensuring reliable movement control regardless of which power source is active
Data Source
AI summary
Methods and systems are provided for reducing vehicle movement during standstill. In one example, a method for a hybrid or electric vehicle may include monitoring a requested torque of an electric machine and a clutch position, predicting a torque at an output shaft by multiplying the requested torque and clutch position, and operating the hybrid or electric vehicle in a default state in response to an indication of a predicted torque exceeding a threshold torque.