Engine Idle Speed Control for Wheel Slip Prevention

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Solution Overview

Problem

Existing engine control systems fail to effectively limit wheel slip, particularly in diesel engines with high idle speeds and during diesel particulate filter regeneration, due to sudden torque transmission and high idle speeds, leading to wheel slip issues even on low-friction surfaces.

Innovation Solution

An engine control system comprising an engine speed control module and an idle limiting module that selectively reduces idle speed based on wheel slip values, using a control system with modules for DPF control, engine control, transmission control, and stability control to manage engine torque and reduce wheel slip by adjusting idle RPM through a multiplexer and actuator control module.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If idle speed is maintained at high levels for normal engine operation, then engine power and responsiveness are improved, but wheel slip occurs on low-friction surfaces

Engineering Contradiction:

Improveengine powerVSAvoidwheel slip prevention

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The idle speed is made dynamic rather than fixed. The control system continuously monitors wheel slip conditions and adjusts idle speed in real-time, transitioning between high idle (for power) and reduced idle (for slip prevention) based on actual driving conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the idle speed parameter based on wheel slip detection. When wheel slip is detected, the idle speed parameter is reduced from its normal high value to a lower value, directly addressing the slip condition while maintaining the capability for high power when needed

Inventive Principle:

Principle #35Parameter changes

2Reliability

If idle speed is reduced to prevent wheel slip, then wheel slip is limited, but engine power and responsiveness deteriorate

Engineering Contradiction:

Improvewheel slip preventionVSAvoidengine power

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The idle speed is dynamically adjusted based on real-time wheel slip conditions rather than being permanently reduced. When wheel slip conditions clear, the system returns to normal high idle speed, maintaining engine power and responsiveness when slip prevention is not needed

Inventive Principle:

Principle #15Dynamics

3Reliability

If idle speed is suddenly reduced to limit wheel slip, then wheel slip is controlled, but engine stability and driver comfort worsen due to abrupt torque changes

Engineering Contradiction:

Improvewheel slip controlVSAvoidengine stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The control system prepares for idle speed changes by monitoring wheel slip conditions in advance. When slip is detected, the system smoothly transitions idle speed rather than making abrupt changes, cushioning the torque transmission to maintain engine stability and driver comfort

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The control system continuously monitors wheel slip conditions and makes periodic adjustments to idle speed. This continuous feedback loop allows for smooth, controlled transitions rather than sudden changes, maintaining engine stability while preventing wheel slip

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8099229B2Method and apparatus for limiting wheel slip

Publication Date: 2012.01.17 GM GLOBAL TECHNOLOGY OPERATIONS LLC

AI summary

An engine control system comprises an engine speed control module and an idle limiting module. The engine speed control module selectively controls an engine based on an idle speed request. The idle limiting module selectively reduces the idle speed request by an amount that is based on a wheel slip value.