Variable Oil Pump Control for Engine Lubrication Efficiency
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Solution Overview
Problem
Existing oil pump systems for vehicles face challenges in balancing fuel efficiency and protecting the engine lubrication system, particularly under varying engine loads, as they either compromise on fuel efficiency or fail to maintain adequate oil pressure.
Innovation Solution
An oil pump control method and system that sets initial target oil pressure based on engine rotation speed and temperature, determines a pressure compensation value considering target torque or fuel quantity, and feedback-controls the oil pump to maintain a final target oil pressure, using sensors and a control unit to adjust the solenoid valve accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical variable oil pump is used to maintain uniform oil pressure regardless of engine revolutions, then oil pressure stability is improved, but fuel efficiency deteriorates due to low revolution speed in diesel engines
Solution Approach 1:
The patent applies dynamics by making the oil pump's discharge pressure variable rather than fixed. The control unit dynamically adjusts the target discharge pressure based on real-time engine load conditions, allowing the system to adapt to changing operational requirements. This resolves the contradiction by enabling the oil pump to maintain adequate pressure when needed (improving reliability) while reducing pressure during low-load conditions (improving fuel efficiency).
Solution Approach 2:
The patent changes the pressure parameter dynamically based on engine load. By using a control unit that calculates target discharge pressure according to engine load conditions and adjusts the oil pump accordingly, the system transitions from a static pressure maintenance approach to a dynamic parameter adjustment approach, simultaneously improving both reliability and fuel efficiency.
2Use of energy by moving object
If variable start point is set at low pressure to improve fuel efficiency, then fuel efficiency is improved, but oil pressure adjustment capability under full load deteriorates
Solution Approach 1:
The patent implements feedback control by continuously monitoring engine load conditions and adjusting the target discharge pressure accordingly. The control unit receives information about engine operating conditions and dynamically modifies the oil pump's discharge pressure to match actual needs, ensuring both fuel efficiency during normal operation and adequate pressure adjustment capability when full load is required.
Solution Approach 2:
The system transitions from a static variable start point setting to a dynamic pressure adjustment mechanism. The control unit continuously adapts the target discharge pressure based on real-time engine load conditions, allowing the system to optimize fuel efficiency during low-load operation while maintaining full pressure adjustment capability when high load conditions occur.
3Reliability
If oil pressure is increased to protect engine lubrication system under high load, then engine protection is improved, but fuel efficiency decreases due to higher pressure requirements
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the discharge pressure parameter based on engine load conditions. During high-load conditions, the control unit increases the target discharge pressure to ensure adequate engine protection, while during low-load conditions, it reduces the pressure to improve fuel efficiency. This conditional parameter adjustment resolves the contradiction between engine protection and fuel efficiency.
Solution Approach 2:
The system uses dynamic pressure adjustment rather than maintaining a constantly high pressure. The control unit monitors engine load and dynamically modifies the oil pump's discharge pressure to match actual protection needs, ensuring engine lubrication system protection when required while minimizing energy consumption during normal operation.
Data Source
AI summary
Disclosed are an oil pump control system and method, the oil pump control method including setting an initial target oil pressure of the oil pump based on a rotation speed of an engine or an oil temperature, determining a pressure compensation value by considering the target torque or target fuel quantity of the engine based on the initial target oil pressure, determining a final target oil pressure by adding the pressure compensation value to the initial target oil pressure, and feedback-controlling the oil pump so that current oil pressure measured in real time follows the final target oil pressure.