Variable Displacement Oil Pump Control for Engine Dilution
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Solution Overview
Problem
Indiscriminate increase in oil pump discharge at low temperatures leads to oil dilution in internal combustion engines, causing performance issues and increased fuel consumption when starting in cold conditions.
Innovation Solution
A control device for internal combustion engines that includes a variable displacement oil pump, an air-fuel ratio sensing unit, and a control unit to adjust the oil pump discharge based on the air-fuel ratio, switching between low and high discharge modes to prevent oil dilution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of discharge of the oil pump is increased when the oil temperature is low, then the oil flow rate is improved, but the friction of the internal combustion engine increases and oil dilution occurs
Solution Approach 1:
The patent applies dynamics by making the oil pump discharge amount variable rather than fixed. The control unit dynamically adjusts the oil pump discharge amount based on real-time air-fuel ratio feedback, transitioning between high discharge and low discharge modes to optimize both oil flow rate and prevent oil dilution under different operating conditions.
Solution Approach 2:
The patent implements feedback control by using the air-fuel ratio sensor to continuously monitor the air-fuel ratio and feed this information back to the control unit. The control unit then adjusts the oil pump discharge amount based on this feedback, creating a closed-loop control system that prevents oil dilution while ensuring sufficient oil flow.
2Power
If the fuel is set further on the increasing side to increase engine torque, then the engine torque is improved, but much fuel adheres in the combustion chamber and dilutes the oil
Solution Approach 1:
The patent applies preliminary anti-action by proactively controlling the oil pump discharge amount before significant oil dilution occurs. When the air-fuel ratio indicates rich combustion conditions, the control unit preemptively adjusts the oil pump discharge to prevent excessive fuel from adhering to the combustion chamber and diluting the oil, rather than waiting for dilution to occur.
Solution Approach 2:
The patent changes the parameter of oil pump discharge amount based on the air-fuel ratio parameter. By monitoring changes in the air-fuel ratio and相应地 adjusting the oil pump discharge parameter, the system optimizes both engine torque and prevents oil dilution through coordinated parameter control.
Data Source
AI summary
A control device for an internal combustion engine is provided which enables control of dilution of oil by fuel and water drops, i.e., control of the amount of so-called oil dilution. The control device for an internal combustion engine that is lubricated or cooled by oil includes: a variable displacement oil pump capable of varying the amount of discharge of the oil; an air-fuel ratio sensor for sensing an air-fuel ratio of the internal combustion engine; and an ECU for controlling the amount of discharge of the variable displacement oil pump. The ECU controls the amount of discharge of the variable displacement oil pump, based on the air-fuel ratio sensed by the air-fuel ratio sensor.