Engine Idle Control for Cabin Temperature and Fluid Conservation
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Solution Overview
Problem
Cargo vehicles face fuel and fluid depletion issues when idling for extended periods, as the engine operates to maintain cabin comfort features, potentially leaving insufficient fluids for travel to the next service station.
Innovation Solution
A method and engine control assembly that determine fuel and reductant levels, calculate engine idle time based on cabin temperature and minimum fluid requirements, and control engine starting/stopping to maintain sufficient fluid levels, incorporating sensors for fuel, reductant, temperature, and park brake status to manage engine operation effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the engine operates at idle to maintain cabin heat, air conditioning, and electrical components, then operator comfort in the cabin is improved, but the quantity of fuel and vehicle fluids decreases
Solution Approach 1:
The system performs preliminary calculation of available idle time based on current fuel/fluid levels and consumption rates before allowing the engine to idle. This ensures that the engine will be shut off before fluids are depleted, preventing the harmful effect of insufficient fluids while still allowing comfort features to operate during the calculated safe period.
Solution Approach 2:
The system continuously monitors fuel and fluid levels, recalculating available idle time in real-time. This feedback mechanism allows dynamic adjustment of engine idle operation, ensuring that comfort features remain operational as long as sufficient fluids are available, while automatically preventing operation when fluid levels approach critical thresholds.
2Ease of operation
If the engine idles for extended periods to maintain cabin features, then operator comfort is improved, but the time available for travel to the next service station decreases
Solution Approach 1:
The system calculates the maximum safe idle duration in advance based on current fluid levels and consumption rates before permitting engine operation. This preliminary time calculation ensures that the engine is automatically shut off before fluid depletion occurs, preventing loss of travel time to service stations while still allowing comfort features to operate during the pre-calculated safe period.
Solution Approach 2:
The system continuously monitors fluid levels and recalculates available idle time in real-time, providing feedback that dynamically adjusts engine operation. This ensures that comfort features operate for the maximum safe duration while automatically preventing operation when remaining time becomes insufficient for reaching the next service station.
3Quantity of substance
If the engine is shut off to conserve fuel, then fuel quantity is maintained, but operator comfort in the cabin deteriorates
Solution Approach 1:
The system performs preliminary calculation of safe idle time based on current fuel levels and consumption rates before allowing the engine to start. This ensures that the engine operates long enough to maintain cabin comfort but is automatically shut off before fuel is depleted, maintaining both fuel quantity and operator comfort within acceptable ranges.
Solution Approach 2:
The system continuously monitors fuel levels and recalculates available idle time in real-time, providing feedback that dynamically adjusts engine operation. This feedback mechanism allows the engine to remain running to maintain comfort as long as sufficient fuel is available, while automatically shutting off when fuel levels approach critical thresholds.
Data Source
AI summary
A method for operating an engine based on cabin temperature includes determining a quantity of fuel in a fuel tank, determining a minimum amount of fuel to remain in the fuel tank, receiving a predetermined cabin temperature value, calculating an engine idle time in response to the minimum amount of fuel and the predetermined cabin temperature value, and controlling engine starting and stopping in response to the engine idle time and the predetermined cabin temperature value.