Dual Coolant Pump Diagnosis and Switching Logic
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Solution Overview
Problem
Current dual pump coolant systems in automobiles rely on both mechanical and electric coolant pumps, but lack a method to effectively monitor and ensure proper operation of the mechanical coolant pump, leading to potential fuel economy issues and limited operation when the mechanical pump fails.
Innovation Solution
A method and system that detects engine startup, disengages the electric coolant pump, engages and verifies the mechanical coolant pump's operation by switching a diverter valve and using sensors to confirm coolant flow and temperature equality, switching back to the electric pump when the mechanical pump is not functioning properly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the mechanical coolant pump is used to provide high coolant flow, then cooling performance is improved, but fuel economy deteriorates due to engine power consumption
Solution Approach 1:
The system dynamically switches between mechanical and electric coolant pumps based on real-time cooling demands. The controller monitors engine temperature and coolant flow requirements, engaging the mechanical pump only when high coolant flow is needed and using the electric pump for normal operating conditions, thereby optimizing the balance between cooling performance and fuel economy.
Solution Approach 2:
The system changes the operational parameters by switching between two different pump mechanisms. The mechanical pump operates at high capacity when maximum coolant flow is required, while the electric pump operates at lower capacity for normal conditions. This parameter change allows the system to match coolant supply with actual cooling needs, improving fuel economy without compromising cooling performance.
2Use of energy by moving object
If the electric coolant pump is used to minimize power consumption, then fuel economy is improved, but coolant flow capability deteriorates when high cooling demand occurs
Solution Approach 1:
The system dynamically selects which pump to engage based on real-time cooling demands. The controller continuously monitors engine temperature and cooling requirements, switching to the mechanical pump when high coolant flow is needed and using the electric pump for normal operating conditions, thereby optimizing the balance between power consumption and coolant flow capability.
Solution Approach 2:
The cooling system incorporates both a mechanical coolant pump and an electric coolant pump, each serving different operational requirements. The mechanical pump provides high-capacity cooling when needed, while the electric pump handles normal operating conditions. This multi-functional approach allows the system to meet varying cooling demands efficiently without relying on a single pump type.
3Reliability
If the mechanical coolant pump fails, then reliability of the cooling system deteriorates, but the system can continue operating with limited capability using only the electric pump
Solution Approach 1:
The system prepares for mechanical pump failure by continuously monitoring its operation and having the electric pump ready as a backup. The controller verifies mechanical pump functionality during normal operation and can immediately switch to the electric pump if failure is detected, cushioning against the impact of mechanical pump failure and maintaining limited cooling capability.
Solution Approach 2:
The system uses feedback from sensors to monitor mechanical pump operation and coolant flow conditions. The controller receives signals from temperature sensors and pump sensors to determine pump status and switch between pumps accordingly. This feedback mechanism ensures reliable detection of mechanical pump failure and enables timely switching to the electric pump, maintaining system reliability while adapting to reduced capabilities.
Data Source
AI summary
A method of diagnosing a mechanical coolant pump in an automobile equipped with cooling system having a mechanical coolant pump and an electric coolant pump comprises detecting when an engine of the automobile has been started, dis-engaging the electric coolant pump, engaging the mechanical coolant pump, and verifying the mechanical coolant pump is operating properly.