Vehicle Torque Control for Water-Diluted Engine Oil
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle systems, as described in Japanese Laid-Open Patent Publication No. 2017-081447, face challenges in providing sufficient drive force when the state of charge of the battery is insufficient, as they rely solely on a second motor generator during crankshaft rotation by a first motor generator, leading to potential drive force deficiencies.
Innovation Solution
A controller for a vehicle that calculates the diluted water amount in lubricating oil and adjusts torque application to the internal combustion engine based on this calculation, reducing torque per unit period when the diluted water amount is high, while maintaining engine operation, thereby optimizing engine performance and ensuring consistent drive force even with varying water dilution levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the vehicle relies solely on the second motor generator during crankshaft rotation by the first motor generator, then the system structure is simplified, but the drive force becomes insufficient when the battery state of charge is low
Solution Approach 1:
The patent applies dynamics by making the torque application to the internal combustion engine variable rather than fixed. The controller dynamically adjusts the torque per unit period based on the diluted water amount calculated from engine operation state, allowing the system to adapt torque output to current engine conditions while maintaining continuous operation and sufficient drive force.
Solution Approach 2:
The patent changes the parameter of torque per unit period based on the diluted water amount in lubricating oil. By calculating the water amount from engine operation state and adjusting torque accordingly, the system optimizes engine performance under varying water dilution conditions while ensuring consistent drive force delivery.
2Quantity of substance
If the internal combustion engine is stopped to reduce water mixed in lubricating oil, then the water amount in lubricating oil is reduced, but the drive force requested by the vehicle cannot be fully provided when battery state of charge is insufficient
Solution Approach 1:
The patent applies preliminary action by continuously calculating the diluted water amount based on engine operation state and proactively adjusting torque before water dilution reaches critical levels. This preventive approach allows the engine to continue operating while maintaining optimal performance, avoiding the need to stop the engine to reduce water content.
Solution Approach 2:
The patent implements feedback by using the calculated diluted water amount from engine operation state to continuously adjust torque application. The controller monitors engine conditions, calculates water accumulation, and adjusts torque in real-time, creating a closed-loop system that maintains both acceptable water levels and sufficient drive force.
3Reliability
If torque per unit period is reduced when diluted water amount is large, then engine performance is optimized under water dilution conditions, but the drive force delivery may be affected
Solution Approach 1:
The patent changes the torque parameter based on the diluted water amount to optimize engine performance. By adjusting torque per unit period according to calculated water levels, the system maintains reliable engine operation under water dilution conditions while the controller compensates to ensure consistent drive force delivery to the vehicle.
Data Source
AI summary
A vehicle including an internal combustion engine and an automatic transmission capable of transmitting and receiving torque to and from an output shaft of the internal combustion engine is controlled. During operation of the internal combustion engine, a process that calculates a diluted water amount based on an operation state of the internal combustion engine is executed. The diluted water amount is the amount of water contained in lubricating oil in the internal combustion engine. Further, a process that controls the automatic transmission such that torque per unit period in the internal combustion engine becomes smaller when the diluted water amount is relatively large compared to when the diluted water amount is relatively small, while continuing the operation of the internal combustion engine, is executed.