Vehicle Control System Torque Range Feedback
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Solution Overview
Problem
Conventional vehicle control systems face difficulties in accurately controlling power train output torque within allowable ranges, leading to potential operational errors and unintended torque output due to neglecting engine and transmission conditions, as well as hierarchical element failures.
Innovation Solution
A vehicle control system that determines and corrects the target output torque based on preselected operating maneuvers and allowable torque ranges, considering engine speed, coolant temperature, transmission shift timing, accessory loads, and vehicle conditions, using multiple electronic control units to ensure the power train operates within safe torque limits and detects errors in target torque settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power train controller is given the target output torque by a higher hierarchical element without regard to the allowable torque range, then the control system can operate with simple hierarchical structure, but it results in difficulty in controlling the power train correctly and may cause operational errors
Solution Approach 1:
The power train controller feeds back the allowable torque range to the higher hierarchical element (manager controller). This feedback mechanism enables the manager controller to determine the target output torque within the feasible range, ensuring both simple hierarchical structure and reliable power train control. The feedback loop allows the system to maintain operational accuracy without complex restructuring.
2Speed
If the hierarchical element determines the target output torque without considering engine and transmission conditions, then the control response is fast and direct, but it leads to unintended torque output and operational errors
Solution Approach 1:
The power train controller preliminarily determines the allowable torque range based on engine and transmission conditions before the manager controller determines the target output torque. This preliminary action ensures that the subsequent torque determination is both rapid and precise, as the feasible range is pre-established based on real-time system conditions.
3Productivity
If the system operates without checking the target output torque against the allowable torque range, then the control system operates with minimal processing, but it cannot detect failures in hierarchical elements
Solution Approach 1:
The system uses feedback comparison between the target output torque and the allowable torque range to detect failures. When the target torque falls outside the allowable range, the system identifies a potential failure in the hierarchical element. This feedback mechanism maintains high processing efficiency while enabling reliable failure detection.
Data Source
AI summary
A vehicle control system for automotive vehicles which is designed to optimize an output torque of a power train at all times. A power train control unit determines an allowable torque range within which the power train is allowed to output torque and provides it to a manager control unit. The manager control unit determines a target output torque of the power train based on an operating maneuver of a vehicle driver. When the target output torque is out of the allowable torque range, the manager control unit corrects it to lie within the allowable torque range, thereby optimizing an output of the power train.