Electric Oil Pump Control for Idle Stop and Go Vehicles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional technologies for controlling Electric Oil Pumps (EOP) in vehicles with Idle Stop and Go (ISG) systems lead to unnecessary battery power consumption when the engine is stopped, as the EOP is continuously driven to maintain hydraulic pressure in the automatic transmission.
Innovation Solution
A device and method that control the EOP based on traffic light lighting information and vehicle travel direction, turning it off when the engine is stopped and restarting it ahead of the expected traffic light lighting time, or maintaining it on for short waiting times or right turns, to prevent unnecessary battery consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EOP is continuously driven to maintain hydraulic pressure in the automatic transmission, then the hydraulic pressure is maintained, but the battery power consumption increases unnecessarily
Solution Approach 1:
The controller predicts traffic light information ahead of time and activates the EOP before the vehicle actually needs hydraulic pressure. This preliminary action ensures that when the vehicle needs to move (e.g., at a green light), the hydraulic pressure is already ready, avoiding the need for continuous EOP operation and reducing unnecessary battery consumption during idle periods
Solution Approach 2:
Instead of continuous operation, the EOP is activated periodically based on predicted traffic conditions. The controller turns the EOP on only during periods when hydraulic pressure is anticipated to be needed (based on traffic light predictions and vehicle state), and turns it off during periods when it won't be needed, creating a periodic rather than continuous operation pattern that reduces energy consumption
2Use of energy by moving object
If the EOP is turned off to reduce battery power consumption, then energy is saved, but the hydraulic pressure may drop causing oscillation shock and shift delay
Solution Approach 1:
The system performs preliminary activation of the EOP based on predicted traffic light information before the vehicle actually needs to move. This ensures hydraulic pressure is rebuilt in advance, so when the vehicle needs to shift or move (e.g., at a green light), the pressure is already sufficient, preventing oscillation shock and shift delay while allowing the EOP to be off during extended idle periods
Solution Approach 2:
The control strategy dynamically adjusts EOP operation based on real-time vehicle state and predicted traffic conditions. The controller continuously monitors engine state, vehicle speed, and traffic light predictions to dynamically determine when to activate or deactivate the EOP, optimizing the balance between hydraulic pressure maintenance and energy consumption
3Reliability
If the EOP is activated early based on traffic light prediction, then hydraulic pressure is ready in advance, but the EOP may run longer than necessary increasing energy consumption
Solution Approach 1:
The system applies partial action by activating the EOP only for the minimum necessary duration to rebuild hydraulic pressure to the required level, rather than running it for a fixed extended period. The controller monitors pressure buildup and turns off the EOP as soon as sufficient pressure is achieved, avoiding excessive operation time while ensuring pressure readiness
Data Source
AI summary
A device for controlling an electric oil pump (EOP), which is configured to supply a hydraulic pressure to a vehicle, includes a controller that controls driving of the EOP based on lighting information of a traffic light corresponding to a travel direction of the vehicle in a state in which an engine of the vehicle is stopped as an Idle Stop and Go (ISG) system of the vehicle is operated.