Vehicle Engine Stop Control Device with Oil Pump Abnormality Detection
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Solution Overview
Problem
Existing vehicle control systems unnecessarily restart the drive source after it stops, leading to excessive fuel and power consumption, even when an abnormality occurs in the electrical oil pump, which can be avoided to improve fuel and electric mileage.
Innovation Solution
A vehicle control device and method that includes an abnormality determination unit to assess if an electrical oil pump is faulty and a control unit to continue automatic stop until it is determined that restarting the drive source is necessary, based on parameters related to drive force responsiveness, thereby preventing unnecessary restarts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drive source is restarted immediately after stopping when an abnormality occurs in the electrical oil pump, then the mechanical oil pump can generate hydraulic pressure, but the drive source is restarted unnecessarily causing extra fuel and power consumption
Solution Approach 1:
The control unit changes the restart decision parameter from 'immediate restart upon electrical oil pump abnormality' to 'delayed restart based on hydraulic pressure status'. The system now evaluates whether hydraulic pressure is actually insufficient before restarting, transforming the restart decision from a fixed response to a conditional response based on real-time pressure parameters
Solution Approach 2:
The control unit implements feedback by continuously monitoring hydraulic pressure status and using this information to determine whether restart is necessary. The system feeds back the actual hydraulic pressure condition to the restart decision logic, allowing the drive source to remain stopped if pressure is sufficient, or restart only when pressure deficiency is detected
2Reliability
If the drive source is restarted immediately after stopping when an abnormality occurs in the electrical oil pump, then hydraulic pressure can be supplied by the mechanical oil pump, but fuel mileage and electric mileage deteriorate
Solution Approach 1:
The system changes the control parameter from automatic immediate restart to conditional restart based on hydraulic pressure status. This parameter transformation allows the system to maintain energy efficiency by avoiding unnecessary restarts while still ensuring hydraulic pressure supply when actually needed
Solution Approach 2:
The electrical oil pump abnormality, which initially triggers unnecessary restarts and energy loss, is converted into a beneficial condition. The system uses the abnormality detection to implement smarter control that delays restart until truly necessary, transforming a harmful automatic response into a beneficial energy-saving opportunity
Data Source
AI summary
A vehicle control device controls a vehicle including a first oil pump adapted to be driven by power generated by a first drive source, automatically stop when a predetermined condition is satisfied, and supply oil to a power transmission unit and a second oil pump adapted to supply oil to the power transmission unit when the drive source is in an automatically stopped state, and includes a control unit adapted to continue an automatic stop until it is determined to restart the first drive source based on a parameter with which a reduction in drive force responsiveness to a drive force request from a driver, not including the stop of the first drive source, can be determined after an automatic stop command of the first drive source is output and if there is an abnormality in the second oil pump.