Engine Power Estimation for Gear Shift Completion

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Solution Overview

Problem

Existing vehicle transmission systems experience inefficient gear shifting, leading to unnecessary gear changes and decreased fuel efficiency due to the inability to accurately estimate engine power at gear shift completion time, resulting in gear shift shock and suboptimal performance.

Innovation Solution

An engine power estimation apparatus that calculates a target axle speed using a gear shift time learning value and engine load information to determine the target engine power at gear shift completion time, preventing unnecessary gear shifts and improving shifting performance by controlling the engine according to predicted driver requests.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If gear shifting is controlled based on standardized patterns and current engine power, then the transmission control is simplified, but unnecessary gear changes occur and fuel efficiency deteriorates

Engineering Contradiction:

Improvetransmission control complexityVSAvoidfuel efficiency

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

The system performs preliminary calculation of target engine power at the expected gear shift completion time, rather than reacting to current engine power. By predicting the engine power state at the moment gear shift will complete, the system proactively determines optimal shift timing, preventing unnecessary gear changes and improving fuel efficiency while maintaining control simplicity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates feedback by comparing the calculated target engine power with actual engine power requirements. The gear shift decision is made based on whether the target engine power at completion time meets the driver's requested power, creating a closed-loop control that adapts to actual driving conditions rather than following rigid standardized patterns

Inventive Principle:

Principle #23Feedback

2Speed

If gear shift timing is determined based on current engine power, then the control response is fast, but the engine power estimation at gear shift completion time is inaccurate

Engineering Contradiction:

Improvecontrol response speedVSAvoidengine power estimation accuracy

Core Design Contradiction:

SpeedVSMeasurement precision

Solution Approach 1:

The system calculates the target engine power at the expected gear shift completion time in advance, rather than waiting until the shift occurs. By using the current axle speed, gear shift time learning values, and engine load information to predict future engine power state, the system achieves both fast response (calculation starts immediately) and high accuracy (estimation is for the actual completion moment)

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If standardized shifting maps are used, then the transmission control is simple, but gear shift shock increases and shifting performance deteriorates

Engineering Contradiction:

Improvetransmission control complexityVSAvoidgear shift performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system determines the appropriate target gear stage in advance by calculating whether the target engine power at completion time meets driver requirements. This preliminary determination allows for smooth, pre-planned gear transitions rather than reactive shifts, reducing gear shift shock and improving shifting performance while keeping control logic relatively simple

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the control parameter from current engine power to target engine power at gear shift completion time. By basing gear shift decisions on the predicted future engine power state rather than current power, the system achieves smoother transitions and better shifting performance without significantly increasing control complexity

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9500149B2Apparatus and method for estimating engine power

Publication Date: 2016.11.22 HYUNDAI KEFICO CORP

AI summary

Provided is an engine power estimation apparatus for estimating an engine power at a gear shift completion time when making a speed change of a vehicle. The engine power estimation apparatus includes a gear shift detection unit configured to detect the speed change of the vehicle; an axle speed estimation unit configured to calculate a target axle speed at the gear shift completion time, using an axle speed and a gear shift time learning value, when the speed change of the vehicle is detected; and an engine power estimation unit configured to calculate a target engine power at the gear shift completion time, using the target axle speed and engine load information.