Engine Torque Control via Steering Angle Segmentation
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Solution Overview
Problem
Conventional engine control devices face responsiveness issues in accurately achieving the intended vehicle behavior during steering operations due to delays in communication between sensors and the Power-train Control Module (PCM), leading to insufficient control over torque reduction and load application on front wheels.
Innovation Solution
A control device with a processor-based configuration that includes a steering angle detector, a slip controller, a torque reduction amount determining module, and an engine controlling module, which directly determines torque reduction amounts based on steering angle inputs, allowing for high responsiveness and accurate engine control to achieve the desired vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DSC calculates required deceleration and drive force reduction amount based on steering angle and communicates with PCM, then the engine output control is achieved, but the responsiveness to steering operation is insufficient due to communication time delays
Solution Approach 1:
The patent segments the torque control into two independent pathways: (1) DSC calculates torque control amount based on slip state for stability control, and (2) a separate module determines torque reduction amount directly from steering angle for responsive vehicle behavior control. This segmentation allows each pathway to operate independently without communication delays, resolving the contradiction between reliable control and responsiveness.
Solution Approach 2:
The patent implements preliminary action by having the torque reduction amount determining module pre-calculate the required torque reduction based on steering angle before the DSC-PCM communication cycle completes. This preliminary determination ensures that the torque reduction is ready to be applied immediately when steering input is detected, eliminating the responsiveness delay while maintaining the reliability of the DSC control pathway.
2Stability of the object's composition
If the DSC limits engine output according to steering angle to suppress slip and torque steering, then vehicle stability is improved, but the deceleration production and load application on front wheels are delayed
Solution Approach 1:
The patent introduces an intermediary torque reduction amount determining module that acts as a dedicated interface between the steering angle sensor and the engine control system. This intermediary module directly translates steering angle into torque reduction commands without waiting for the DSC calculation cycle, thereby eliminating the time delay in torque reduction while the DSC continues to provide stability control through its separate pathway.
Data Source
AI summary
A control device for controlling an engine based on a vehicle operating state is provided, which includes a steering angle detector for detecting a vehicle steering angle, and a processor configured to execute a basic target torque determining module for determining a basic target torque based on a vehicle operating state, a slip controller for acquiring the steering angle from the steering angle detector, detecting a slip state of wheels based on part of the vehicle operating state, and determining a torque control amount based on the slip state, a torque reduction amount determining module for acquiring the steering angle and determining a torque reduction amount based thereon, a final target torque determining module for determining a final target torque based on the basic target torque, the torque reduction amount, and the torque control amount, and an engine controlling module for controlling the engine to output the final target torque.