Chassis Request Evaluation Module Torque Control

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Solution Overview

Problem

Engine control systems face challenges in managing torque output to meet chassis torque requests while ensuring safe and efficient operation, particularly in scenarios involving wheel drag, vehicle speed, transmission states, and fault diagnostics.

Innovation Solution

An engine control system comprising a torque module and a chassis request evaluation module that selectively adjusts torque output based on vehicle speed, transmission state, accelerator pedal position, and driven wheel speed, preventing unnecessary torque increases and diagnosing short request events to prevent over-torque conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the torque module increases torque output based on chassis torque request, then wheel drag is eliminated and vehicle stability is improved, but the risk of over-torque conditions and fault-related issues increases

Engineering Contradiction:

Improvevehicle stabilityVSAvoidover-torque conditions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The chassis request evaluation module continuously monitors vehicle operating conditions and provides feedback to the torque module to dynamically adjust torque output. This feedback mechanism ensures torque increases are applied only when appropriate conditions exist, eliminating wheel drag while preventing over-torque conditions through real-time condition assessment.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system changes the operational parameters of the torque module by selectively enabling or disabling torque increases based on multiple vehicle state parameters including transmission state, vehicle speed, accelerator pedal position, and driven wheel speed. This parameter-based control resolves the contradiction by adapting torque output to specific operating conditions.

Inventive Principle:

Principle #35Parameter changes

2Loss of energy

If the chassis request evaluation module selectively prevents torque increases based on multiple vehicle conditions, then unnecessary torque increases are avoided, but the device complexity increases

Engineering Contradiction:

Improveunnecessary torque increasesVSAvoidcontrol module complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The chassis request evaluation module serves multiple functions simultaneously: it evaluates transmission state, vehicle speed, accelerator pedal position, and driven wheel speed conditions, and coordinates torque module responses. This multi-functionality consolidates what would otherwise require separate control systems into a single module, managing complexity while preventing unnecessary torque increases.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The evaluation module performs preliminary assessment of all relevant vehicle conditions before the torque module executes torque increases. By pre-evaluating transmission state, speed, pedal position, and wheel speed conditions, the system prevents unnecessary torque applications without requiring complex real-time decision-making during torque execution.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8170759B2Chassis system engine torque requests

Publication Date: 2012.05.01 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

An engine control system of a vehicle comprises a torque module and a chassis request evaluation module. The torque module controls a torque output of an engine based on a driver torque request and selectively increases the torque output based on a chassis torque request. The chassis request evaluation module selectively prevents the increase of the torque output based on at least one of a vehicle speed, a transmission state, and an accelerator pedal position.