Axle Torque Arbitration for Hybrid Vehicle Power Security
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Solution Overview
Problem
Traditional driver interpretation systems for internal combustion engines do not accurately control engine output torque and fail to provide rapid responses to control signals, especially in hybrid electric vehicles, and require redundant transmission speed sensors for accurate torque determination.
Innovation Solution
A control system comprising an axle torque arbitration module, a power security module, and a propulsion torque arbitration module that determines axle torque requests based on driver input and vehicle speed, secures torque requests by minimizing reliance on transmission speed sensors, and adjusts propulsion torque requests to ensure accurate and rapid torque control without redundant sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional driver interpretation systems are used to translate driver input into desired propulsion system torque, then the system is simple to implement, but the torque control accuracy is insufficient and driver expectation standards are not satisfied
Solution Approach 1:
The torque control system is segmented into multiple arbitration modules (axle torque arbitration module, propulsion torque arbitration module) that independently process different torque requests. This segmentation allows for more precise torque control by handling different torque sources and constraints separately, while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The system performs preliminary determination of axle torque request based on driver input and vehicle speed before final propulsion torque arbitration. This preliminary action ensures that the foundation for accurate torque control is established early, improving overall torque control accuracy without requiring complete system redesign.
2Speed
If traditional engine control systems are used to control engine output torque, then the system structure is simple, but the response speed to control signals is slow and coordination among torque-affecting devices is poor
Solution Approach 1:
The control system merges multiple torque control functions into a coordinated framework where the axle torque arbitration module and propulsion torque arbitration module work together. This merging enables rapid response to control signals by integrating air, spark, and fuel control in a unified system, improving response speed while managing complexity through functional integration.
Solution Approach 2:
The system incorporates feedback mechanisms where the propulsion torque arbitration module receives inputs from both the axle torque arbitration module and power security module, and adjusts engine output torque accordingly. This feedback loop enables rapid response to control signals and real-time coordination among torque-affecting devices.
3Measurement precision
If redundant transmission speed sensors are used to determine accurate transmission ratio, then the measurement accuracy of transmission ratio is improved, but the system complexity and cost increase
Solution Approach 1:
The power security module acts as an intermediary that determines a secured torque request based on axle torque request, vehicle speed, and engine speed. This intermediary component provides a safety layer that ensures accurate torque control without requiring redundant transmission speed sensors, maintaining measurement accuracy while reducing system complexity.
Solution Approach 2:
The system uses existing sensors (vehicle speed sensor, engine speed sensor) to self-determine the secured torque request without relying on redundant transmission speed sensors. This self-service approach maintains transmission ratio accuracy by utilizing available data sources effectively, reducing the need for additional sensors.
4Device complexity
If the system secures torque requests by minimizing reliance on transmission speed sensors, then the system complexity is reduced, but the challenge of ensuring accurate torque determination increases
Solution Approach 1:
The power security module applies local quality control by determining secured torque request based on specific local conditions (axle torque request, vehicle speed, engine speed) rather than relying on global transmission speed sensor data. This approach reduces sensor requirements while maintaining torque determination reliability through localized parameter assessment.
Solution Approach 2:
The system performs preliminary determination of the secured torque request before final propulsion torque arbitration. This preliminary action ensures that torque determination reliability is established early in the control process, using available data from axle torque request, vehicle speed, and engine speed without requiring redundant sensors.
Data Source
AI summary
A control system includes an axle torque arbitration module, a power security module, a propulsion torque arbitration module, and an actuation module. The axle torque arbitration module determines an axle torque request based on a driver input and a vehicle speed. The power security module determines a secured torque request based on the axle torque request, the vehicle speed, and an engine speed. The propulsion torque arbitration module determines a propulsion torque request based on the axle torque request and the secured torque request. The actuation module controls at least one of air, spark, and fuel provided to a cylinder of an engine based on the propulsion torque request.