Variable Oil Pump Control for Cold-Start Warm-Up and Fuel Use
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Solution Overview
Problem
Variable oil pumps in vehicles fail to efficiently manage discharge pressure and fuel consumption, leading to increased warming-up time and decreased heating performance in cold conditions.
Innovation Solution
A system and method for controlling a variable oil pump that adjusts discharge pressure based on engine cooling water temperature and outdoor temperature using an actuator and controller, with hysteresis lines to manage the actuator's on/off states, optimizing engine load and warming-up time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the variable oil pump maintains high discharge pressure to ensure engine oil pressure, then engine lubrication reliability is improved, but fuel consumption increases and warming-up time is extended in cold conditions
Solution Approach 1:
The patent implements dynamic control of the variable oil pump by adjusting the discharge pressure according to real-time operating conditions including engine RPM, oil temperature, and cooling water temperature. The control unit varies the pump discharge pressure within a predetermined range, transitioning from static high pressure maintenance to dynamic pressure adjustment, thereby reducing fuel consumption while ensuring adequate lubrication under different operating conditions.
Solution Approach 2:
The patent changes the discharge pressure parameter of the oil pump based on operating conditions. By adjusting the discharge pressure according to engine RPM and temperature conditions, the system optimizes the balance between lubrication reliability and fuel consumption, avoiding unnecessary high pressure when not required for engine protection.
2Reliability
If the variable oil pump maintains high discharge pressure to ensure engine oil pressure, then engine lubrication reliability is improved, but warming-up time is extended in cold conditions
Solution Approach 1:
The control unit dynamically adjusts the oil pump discharge pressure based on cooling water temperature and other operating parameters. During cold start conditions, the system reduces discharge pressure to minimize engine load and accelerate warming-up, while still maintaining sufficient pressure for basic lubrication needs, thus resolving the contradiction between reliability and warming-up time.
Solution Approach 2:
The patent incorporates preliminary control strategies for cold start conditions by detecting cooling water temperature and adjusting pump pressure accordingly before the engine reaches normal operating temperature. This preliminary action of reducing pressure during cold start phase accelerates warming-up while ensuring adequate lubrication once the engine is warm.
3Use of energy by moving object
If the actuator is turned on to reduce engine load and fuel consumption, then fuel efficiency is improved, but heating performance deteriorates in cold conditions
Solution Approach 1:
The control unit continuously monitors cooling water temperature and engine operating conditions, using feedback to determine when to activate or deactivate the actuator. When cooling water temperature is low, the system delays actuator activation to maintain higher discharge pressure for engine warming, while switching to fuel-efficient mode when temperature thresholds are met, thus balancing heating performance and fuel efficiency.
Data Source
AI summary
A system for controlling a variable oil pump is provided. The system includes a variable oil pump that varies a discharge pressure of oil and an actuator that is operated to vary the discharge pressure of the oil of the variable oil pump. A controller turns the actuator on or off based a relationship between an outdoor temperature and a cooling water temperature of an engine.