Auxiliary AC Control Circuit for Start-Stop Vehicle Systems
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Solution Overview
Problem
Start-stop systems in vehicles often disrupt the operation of auxiliary air conditioning systems, requiring drivers to manually restart them after the engine is shut off, which is inconvenient, especially for over-the-road vehicles where consistent temperature maintenance is necessary.
Innovation Solution
An auxiliary air conditioning system with a control circuit that receives signals from the start-stop system to automatically turn off and restart the AC system when the engine is turned on and off, respectively, using a NOR gate and output circuitry to manage activation signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the start-stop system shuts off the engine to reduce fuel consumption and emissions, then fuel efficiency improves, but the air conditioning system shuts down causing driver inconvenience and temperature inconsistency
Solution Approach 1:
The control circuit is pre-configured with logic to detect engine shutdown signals from the start-stop system and automatically restart the AC system without requiring driver intervention. This preliminary setup ensures that the AC system is ready to resume operation immediately when the engine restarts, maintaining comfort while allowing fuel-saving shutdowns.
Solution Approach 2:
The AC system performs self-service by automatically detecting when the engine is shut off by the start-stop system and autonomously restarting itself through the control circuit. This eliminates the need for manual driver intervention to restore AC functionality after engine shutdown, maintaining convenience while enabling energy-saving operations.
2Object-generated harmful factors
If the start-stop system automatically shuts off the engine after a predetermined idle period, then emissions are reduced, but the air conditioning requires manual reactivation
Solution Approach 1:
The control circuit merges the start-stop system's engine control functions with the AC system's control functions by integrating signal detection and AC restart logic into a unified control architecture. This combination allows the AC system to respond automatically to start-stop events without adding significant complexity, as the control circuit leverages existing engine management signals.
Solution Approach 2:
The control circuit implements feedback by continuously monitoring signals from the start-stop system regarding engine on/off status. When the engine shutdown signal is detected, the control circuit automatically triggers AC system restart, creating a closed-loop system that responds dynamically to engine state changes without requiring additional complex control mechanisms.
3Temperature
If the air conditioning system remains on during engine shutdown, then temperature consistency is maintained, but fuel consumption increases
Solution Approach 1:
The AC system operates periodically by shutting down when the engine is off and automatically restarting when the engine is on, rather than running continuously. This periodic operation maintains temperature consistency over time while reducing energy consumption during engine shutdown periods, as the AC system only operates when necessary to maintain comfort.
Solution Approach 2:
The control circuit is pre-configured to detect engine shutdown signals and automatically restart the AC system before the driver would need to manually intervene. This ensures temperature consistency is maintained through automatic restart while allowing the AC to shut down during engine-off periods, optimizing the balance between comfort and energy consumption.
Data Source
AI summary
A vehicle includes an engine, a start-stop system configured to stop and restart operation of the engine in response to predetermined triggers, and an auxiliary air conditioning AC system including a controller communicably coupled to the start-stop system. The start-stop system is configured to provide a first indication to the auxiliary AC system indicating ignition of the engine and a second indication to the auxiliary AC system after stopping the engine. The auxiliary AC system is configured to turn off the auxiliary AC system in response to receiving the first indication and restart the auxiliary AC system in response to receiving the second indication.