Vehicle Control Device Jerk Limiting for Pitch Attitude

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Solution Overview

Problem

Conventional vehicle control devices cause significant attitude changes in vehicles with electric or hybrid power sources when transitioning from acceleration to deceleration, leading to discomfort for drivers due to rapid changes in force applied to the neck.

Innovation Solution

A control device that includes a power source, an accelerator pedal sensor, and a control unit that sets a target acceleration and jerk, reducing the rate of change in acceleration as it approaches zero, thereby smoothing the vehicle's pitch attitude change and minimizing neck force changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the accelerator pedal is returned rapidly during acceleration, then the response to driver input is improved, but the vehicle attitude changes greatly causing driver discomfort

Engineering Contradiction:

Improveaccelerator pedal return speedVSAvoiddriver discomfort

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The control device dynamically changes the jerk limit parameter based on the current acceleration state. When acceleration approaches zero, the system reduces the allowable jerk magnitude, thereby suppressing rapid attitude changes and neck force variations even when the accelerator pedal is returned quickly

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system transitions from a static jerk restriction approach to a dynamic one where the jerk limit is continuously adjusted according to the current acceleration level. This dynamic adaptation allows rapid pedal return during high acceleration while preventing discomfort near zero acceleration

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If the target jerk is reduced as target acceleration approaches 0, then driver comfort is improved, but the rate of change in acceleration is limited

Engineering Contradiction:

Improvedriver comfortVSAvoidrate of change in acceleration

Core Design Contradiction:

Object-affected harmful factorsVSSpeed

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system applies partial jerk restriction only when necessary (near zero acceleration) rather than continuously. This partial action maintains high acceleration rates during normal operation while providing comfort protection only in the critical transition region

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20230098578A1Vehicle control device

Publication Date: 2023.03.30 MAZDA MOTOR CORP

AI summary

A control device for a vehicle is provided, which includes a power source that generates torque for driving or braking the vehicle, an accelerator pedal sensor that detects an operating amount of an accelerator pedal, and a control unit that controls the power source. The control unit sets a target acceleration based on the accelerator pedal operating amount detected by the accelerator pedal sensor. The control unit sets a target jerk based on the target acceleration, and when the target acceleration decreases toward 0 from a value above 0, sets the target jerk so that an absolute value of the target jerk becomes smaller as the target acceleration approaches 0. The control unit sets torque to be outputted or regenerated by the power source, based on the target acceleration and the target jerk.