Transmission Clutch Oil Pump Control for Low-Temperature Stall Prevention
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Solution Overview
Problem
Existing electric oil pumps for automobile transmission clutch engagement struggle to supply oil without stopping at extremely low temperatures, as they face high load and motor torque issues, leading to potential motor stalling and inadequate flow rates.
Innovation Solution
An electric oil pump system with a temperature sensor, current determination part, and rotation speed determination part that adjusts motor control based on temperature to ensure continuous oil supply, using current control at low temperatures and rotation speed control at higher temperatures to maintain operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electric oil pump operates at extremely low temperature, then the oil viscosity increases and load on the pump increases, but the motor torque becomes smaller than the sliding force load causing the pump to stop
Solution Approach 1:
The control device performs preliminary action by detecting low temperature conditions and preemptively adjusting motor control parameters (current command value or rotation speed command value) before the motor stalls. This predictive control prevents the torque deficiency from causing shutdown by preparing appropriate control settings in advance.
Solution Approach 2:
The invention applies parameter changes by dynamically modifying motor control parameters based on temperature detection. At extremely low temperatures, the system changes the current command value or rotation speed command value to compensate for reduced motor torque, thereby maintaining continuous operation despite high oil viscosity and load.
2Power
If the electric oil pump increases current to overcome high load at low temperature, then the motor can maintain torque, but electric power consumption increases
Solution Approach 1:
The system applies dynamics by making motor control parameters adaptive rather than fixed. The control device dynamically adjusts current command values or rotation speed command values based on real-time temperature detection, optimizing the balance between maintaining sufficient torque and minimizing power consumption at each temperature condition.
Solution Approach 2:
The invention changes operational parameters (current command value, rotation speed command value) based on temperature conditions. This parameter adaptation allows the motor to operate efficiently across different temperature ranges, increasing current only when necessary to overcome high viscosity loads while consuming less power when conditions permit.
3Use of energy by moving object
If the electric oil pump limits current to reduce power consumption, then energy efficiency improves, but the required oil flow rate cannot be supplied at extremely low temperature
Solution Approach 1:
The control system applies dynamics by making oil supply capability adaptive to temperature conditions. At extremely low temperatures, the system dynamically increases current command values or rotation speed command values to maintain required oil flow rates, while at higher temperatures it reduces current to optimize energy efficiency, achieving both goals under different conditions.
Solution Approach 2:
The invention changes operational parameters based on temperature to balance power consumption and productivity. By adjusting current command values or rotation speed command values according to detected temperature, the system ensures adequate oil flow at low temperatures while minimizing energy consumption when viscosity is lower.
4Productivity
If the electric oil pump increases rotation speed to maintain oil flow rate, then productivity improves, but motor torque requirement increases which may cause stopping at low temperature
Solution Approach 1:
The invention applies parameter changes by adjusting rotation speed command values based on temperature detection. At extremely low temperatures, the system carefully balances rotation speed increases with corresponding current increases, ensuring that torque requirements are met while maintaining adequate oil flow rates, rather than simply maximizing rotation speed.
Solution Approach 2:
The control device applies feedback by continuously detecting temperature and using this information to adjust motor control parameters. This closed-loop approach ensures that rotation speed and current are coordinated appropriately for each temperature condition, preventing torque deficiency while maintaining required productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures continuous oil supply to automobile transmission clutches even at extremely low temperatures by optimizing motor control, preventing stalling and ensuring adequate flow rates while minimizing power consumption.
Implementation Method 1
a temperature sensor that measures a temperature of oil supplied to an oil supply destination relating to clutch engagement of an automobile transmission
Implementation Method 2
an oil pump drive motor; an oil pump that supplies oil to the oil supply destination by the oil pump drive motor being driven
Data Source
AI summary
An electric oil pump for automobile transmission clutch engagement includes: a temperature sensor that measures a temperature of oil supplied to an oil supply destination relating to clutch engagement of an automobile transmission; an oil pump drive motor; a current determination part that determines a current value output to the oil pump drive motor to a predetermined current value determined such that the oil pump drive motor is capable of being driven without stopping in a case where the temperature is equal to or less than a predetermined temperature at which a torque of the oil pump drive motor becomes smaller than a load of the oil pump drive motor; and an oil pump that supplies oil to the oil supply destination by the oil pump drive motor being driven based on the determined current value.