Engine Oil Pump Flow Control for Starting Repetition
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Solution Overview
Problem
Existing engine oil pump control systems fail to adapt to changes in fuel flow and coolant temperature, leading to inefficient oil pressure regulation, which can result in engine control errors and decreased drivability.
Innovation Solution
A method and device that use a controller to adjust the engine oil pump flow amount based on starting repetition, coolant temperature, and time, reducing oil pressure proportionally to maintain optimal lubrication and prevent engine control errors by adjusting the solenoid valve opening or motor speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oil pump flow amount is increased to maintain oil pressure, then lubrication performance is improved, but energy loss increases and fuel efficiency deteriorates
Solution Approach 1:
The oil pump control system dynamically adjusts the flow amount based on real-time operating conditions. The controller receives signals from sensors detecting engine speed, load, and temperature, then modulates the oil pump output accordingly. This dynamic adjustment allows the system to maintain adequate lubrication (improving reliability) while reducing unnecessary oil circulation at low-demand conditions (decreasing energy loss and improving fuel efficiency).
Solution Approach 2:
The system changes the flow parameter of the oil pump based on operating conditions. By varying the flow amount according to engine speed and load parameters, the system optimizes the balance between lubrication performance and energy consumption. At low engine speeds or idle conditions, the flow amount is reduced to minimize energy loss, while at high loads or speeds, the flow is increased to ensure proper lubrication.
2Loss of energy
If the oil pump flow amount is decreased to improve fuel efficiency, then energy loss is reduced, but oil pressure becomes insufficient for proper lubrication
Solution Approach 1:
The control system incorporates feedback from sensors that monitor oil pressure, engine speed, and operating conditions. This feedback loop allows the controller to detect when oil pressure drops below required levels and automatically increase the oil pump flow amount to restore proper lubrication pressure. Conversely, when conditions allow, the system reduces flow to minimize energy loss while maintaining adequate lubrication through continuous monitoring and adjustment.
3Loss of energy
If a two-stage variable oil pump is used to control oil pressure, then fuel efficiency is improved in high-speed mode, but device complexity increases
Solution Approach 1:
The system employs a dynamically controllable oil pump with variable flow capability. Rather than using a complex two-stage mechanical design, the invention achieves variable flow control through electronic control mechanisms that adjust pump operation in real-time based on sensor inputs. This dynamic electronic control approach maintains fuel efficiency benefits while reducing mechanical complexity compared to traditional two-stage variable pumps.
4Reliability
If the oil pump operates at constant flow according to engine speed, then lubrication is maintained, but energy is excessively lost when engine speed is high
Solution Approach 1:
The system changes the flow parameter of the oil pump based on engine operating conditions. Instead of maintaining constant flow proportional to engine speed, the controller adjusts the flow amount according to actual lubrication needs, which are influenced by engine load, temperature, and speed. This parameter adjustment allows the system to maintain reliable lubrication when needed while reducing energy loss during high-speed low-load operations where full lubrication flow is not required.
Data Source
AI summary
A method for controlling an engine oil pump of a vehicle includes: starting, by a controller, an engine of the vehicle; determining, by the controller, whether a number of starting repetition of the engine exceeds a number reference value after the engine is started; and when the number of starting repetition of the engine exceeds the number reference value, controlling, by the controller, a flow amount of an oil pump of the engine to be a flow amount that is less than a flow amount reference value and decreasing the flow amount of the oil pump in proportion to an increase in the number of starting repetition to reduce an oil pressure of the engine. The flow amount reference value of the oil pump is an operating value of the oil pump generated when a fuel does not flow into an engine oil of the engine.