Electrically Driven Compressor Thermal Management for Torque Stability
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Solution Overview
Problem
Electrically driven turbochargers and superchargers in internal combustion engines degrade when operated at high temperatures for extended periods, leading to reduced output and potential disturbances in engine torque and occupant comfort, as existing control methods either limit compressor output or cause abrupt torque changes.
Innovation Solution
A method involving a controller that reduces the output of an electrically driven compressor based on the temperature of a liquid passing through it, while also reducing engine output, thereby smoothing power reduction and minimizing compressor degradation by adjusting throttle opening, coolant flow, and fan speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output of electrically driven compressor is reduced to prevent degradation, then compressor reliability is improved, but engine torque production is disturbed
Solution Approach 1:
The controller dynamically adjusts the compressor output reduction based on real-time temperature conditions, transitioning from full output to reduced output as liquid temperature increases, thereby balancing reliability protection with power maintenance
Solution Approach 2:
The system changes the operational parameters of the compressor by modifying its output level in response to temperature parameter changes, creating a adaptive control strategy that responds to thermal conditions
2Reliability
If output of electrically driven compressor is reduced alone, then compressor degradation is prevented, but driveline torque disturbances occur
Solution Approach 1:
The controller merges the compression control with engine torque management by simultaneously adjusting both compressor output and engine torque, creating a coordinated response that prevents torque disturbances
Solution Approach 2:
Engine torque acts as an intermediary element that compensates for compressor output reduction, smoothing out torque transitions and eliminating abrupt driveline disturbances
3Power
If electrically driven compressor operates at high temperature, then compressor output is maintained, but compressor degradation occurs
Solution Approach 1:
The controller implements feedback control by monitoring liquid temperature and adjusting compressor output accordingly, reducing compressor output when temperature exceeds thresholds to prevent degradation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces driveline torque disturbances, extends compressor lifespan, and maintains smooth engine operation across various engine configurations by gradually reducing electrically driven compressor output in response to temperature thresholds.
Implementation Method 1
reducing output of an electrically driven compressor according to a temperature of a liquid passing through the electrically driven compressor
Data Source
AI summary
Methods and systems for operating an engine with an electrically driven compressor are described. In one example, a model in a controller determines one or more temperatures of the electrically driven compressor to establish a power output upper threshold that is not to be exceeded by the electrically driven compressor. Various actuators may be adjusted responsive to the power output upper threshold to reduce the possibility of electrically driven compressor degradation.