EV Powertrain Oil Supply Valve Control for On-Demand Motor Cooling
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Solution Overview
Problem
Existing electric vehicle powertrain systems waste energy by cooling the motor when it is not necessary, leading to reduced power efficiency due to unnecessary oil flow rate consumption.
Innovation Solution
An oil supply device with a cooling control valve and control method that adjusts oil flow based on motor temperature, preventing unnecessary cooling and optimizing oil flow rate by integrating a motor lubrication and cooling system with a cooling control valve that opens at a predetermined pressure and self-locks until a lower closing pressure is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oil is continuously supplied to the motor for cooling, then the motor cooling function is maintained, but unnecessary oil flow rate consumption occurs when cooling is not required, reducing power efficiency
Solution Approach 1:
The patent applies dynamics by making the oil supply system adjustable rather than fixed. The cooling control valve apparatus dynamically opens or closes based on motor temperature conditions, allowing the system to adapt its oil flow rate to actual cooling needs. This resolves the contradiction by enabling continuous temperature control while avoiding unnecessary oil consumption when cooling is not required.
Solution Approach 2:
The patent changes the parameter of oil flow rate based on operating conditions. By controlling the cooling control valve apparatus to adjust oil flow dynamically, the system modifies the flow rate parameter from a constant state to a variable state that responds to motor temperature, thereby maintaining cooling effectiveness only when needed and improving overall power efficiency.
2Temperature
If oil is supplied to the motor when cooling is not necessary, then cooling function is available, but rapid warm-up of the motor is delayed
Solution Approach 1:
The patent implements periodic action by controlling oil supply in cycles based on temperature thresholds. The cooling control valve apparatus opens when the motor reaches a predetermined temperature and closes when it reaches a lower threshold, creating a periodic on-demand cooling pattern. This allows rapid warm-up when cooling is not needed while ensuring temperature control is activated periodically when required.
3Loss of energy
If a cooling control valve apparatus is added to control oil flow, then unnecessary oil consumption is prevented, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing the cooling control valve apparatus to automatically open or close based on motor temperature conditions without requiring external control systems. The valve apparatus serves itself by using the temperature differential to control oil flow, eliminating the need for complex electronic sensors and control circuits while still achieving the goal of preventing unnecessary oil consumption.
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
Enhances power efficiency by preventing unnecessary cooling, allowing rapid warm-up of the motor and reducing power consumption, while ensuring proper cooling when needed.
Implementation Method 1
the cooling control valve apparatus may be configured to be elastically supported to open when a pressure of oil supplied from the electric oil pump reaches a predetermined opening pressure
Implementation Method 2
a spring is elastically supported on a first side of a valve spool
Implementation Method 3
supply oil from the electric oil pump to a bearing of a motor
Implementation Method 4
supply oil for cooling the motor from the electric oil pump
Data Source
AI summary
An oil supply device for an electric vehicle powertrain apparatus, includes an electric oil pump, a motor lubrication flow path connected to the electric oil pump and provided to supply oil from the electric oil pump to a bearing of a motor, a motor cooling flow path branched from the motor lubrication flow path to supply oil for cooling the motor from the electric oil pump, and a cooling control valve apparatus provided in the motor cooling flow path to control oil supplied to the motor through the motor cooling flow path according to an operating state of the electric oil pump.