Electric Supercharger Actuation Timing Control

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Solution Overview

Problem

Existing electric supercharging systems experience delays in actuation when the accelerator opening is rapidly increased, leading to reduced torque and lowered drivability due to reliance on engine rotational speed for determining the supercharge region without considering the acceleration state.

Innovation Solution

An electric supercharging system with a control unit that adjusts the actuation timing of the electric supercharger based on both engine rotational speed and the rate of change of the accelerator opening, using maps and correction coefficients to optimize actuation timing and prevent delays.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the supercharge region is determined based on engine rotational speed and accelerator opening, then the control logic is simple, but actuation delay occurs during rapid acceleration

Engineering Contradiction:

Improvecontrol logic complexityVSAvoidactuation delay

Core Design Contradiction:

Device complexityVSLoss of time

Solution Approach 1:

The control unit calculates the rate of change of accelerator opening and uses this information to predict when supercharge actuation will be needed, advancing the actuation timing before the actual need arises during rapid acceleration events

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control system dynamically adjusts the supercharge actuation timing based on the calculated rate of change of accelerator opening, making the control strategy adaptive to different acceleration scenarios rather than using fixed thresholds

Inventive Principle:

Principle #15Dynamics

2Speed

If the electric supercharger actuation timing is advanced during acceleration, then torque response is improved, but energy consumption increases

Engineering Contradiction:

Improvetorque response speedVSAvoidelectric supercharger energy consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The control unit changes the actuation timing parameter dynamically based on the rate of change of accelerator opening, advancing timing during rapid acceleration while maintaining normal timing during steady-state operation, thus optimizing the balance between torque response and energy consumption

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP3260681B1Electric supercharging system and method for controlling electric supercharger

Publication Date: 2020.07.15 VOLVO TRUCK CORP

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AI summary

An electric supercharging system has an electric supercharger disposed on an intake air passage of an engine and a control unit in which a microcomputer is built. Then, control unit changes an actuation timing of the electric supercharger on the basis of change amounts of a rotational speed and an accelerator opening of the engine. At this time, the control unit changes the actuation timing of the electric supercharger by correcting the actuation timing of the electric supercharger according to the rotational speed of the engine with a coefficient according to the change amount of the accelerator opening.