Vehicle Compressor Dynamic Cut-Off Threshold Control

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Solution Overview

Problem

Vehicle compressor overheating occurs when the engine runs at high speeds, leading to reduced system efficiency, lubricating oil burning, potential leaks, and increased wear due to high energy absorption and back pressure, necessitating large and costly heat exchange elements and pipes.

Innovation Solution

Adapting the cut-off and cut-in thresholds of the compressor as an inverse function of engine revolutions per minute, allowing for reduced energy absorption and shorter air delivery pipes, with the compressor control unit adjusting these thresholds to manage overheating and optimize compressor operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the compressor operates at high engine speeds to quickly recharge tanks, then the recharging speed improves, but the compressor head overheating worsens

Engineering Contradiction:

Improverecharging speedVSAvoidcompressor head temperature

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The patent applies dynamics by making the cut-off threshold variable rather than fixed. The control unit dynamically adjusts the cut-off threshold based on engine speed: at high engine speeds, the threshold is lowered to reduce compression work and prevent overheating, while at low engine speeds, the threshold is raised to maintain recharging efficiency. This dynamic adaptation resolves the contradiction between fast recharging and overheating prevention.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operational parameter (cut-off threshold pressure) based on operating conditions (engine speed). By modifying the pressure threshold parameter dynamically, the system optimizes compressor operation at different speeds, reducing temperature rise at high speeds while maintaining productivity at low speeds.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If the cut-off threshold is set high to meet all pneumatic needs, then the system capacity improves, but the compressor overheating worsens at high speeds

Engineering Contradiction:

Improvecompressed air capacityVSAvoidcompressor head temperature

Core Design Contradiction:

Quantity of substanceVSTemperature

Solution Approach 1:

The system uses dynamic threshold adjustment based on engine speed. At high speeds, the cut-off threshold is reduced from the high static value, allowing the system to meet capacity needs at low speeds while preventing overheating at high speeds. The control unit continuously monitors engine speed and adapts the threshold accordingly.

Inventive Principle:

Principle #15Dynamics

3Productivity

If the compressor absorbs maximum energy at high engine speeds, then the recharging efficiency improves, but the lubricating oil burning worsens

Engineering Contradiction:

Improverecharging efficiencyVSAvoidlubricating oil burning

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The system takes preliminary anti-action by lowering the cut-off threshold before excessive temperature rise occurs. At high engine speeds, the control unit preemptively reduces the threshold to limit compression work and energy absorption, preventing the temperature conditions that would lead to oil burning, while still maintaining adequate recharging capability.

Inventive Principle:

Principle #9Preliminary anti-action

4Temperature

If long pipes and large heat exchange elements are provided to cool compressed air, then the cooling effectiveness improves, but the device complexity and cost worsen

Engineering Contradiction:

Improvecompressed air temperatureVSAvoidheat exchange system complexity

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent extracts the temperature control function from the mechanical/thermal domain and moves it to the control domain. Instead of using long pipes and large heat exchangers to cool the air, the system extracts heat prevention by controlling compression duration through dynamic threshold adjustment, eliminating the need for complex cooling infrastructure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical cooling system (long pipes, large heat exchange elements) with an electronic control system that adjusts operational parameters. The control unit substitutes thermal management hardware with software-based threshold adjustment, significantly reducing device complexity and cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9926924B2System for managing a vehicle compressor

Publication Date: 2018.03.27 IVECO SPA

AI summary

System for managing a vehicle compressor, wherein the compressor (C) is driven in rotation by a vehicle engine (E). The system varies a stop pressure threshold (cut-off threshold) of the compressor as an inverse function of a compressor speed of rotation. The compressor speed of rotation is directly proportional to the vehicle engine speed of rotation (E).