Electric Oil Pump Diagnosis Timing in Automatic Transmissions
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Solution Overview
Problem
Existing vehicle control systems that diagnose the state of an electric oil pump at predetermined time intervals can cause discomfort to the driver by unnecessarily driving the pump when there is no drive request, while diagnosing at drive times may miss opportunities for diagnosis.
Innovation Solution
A vehicle control system that drives a secondary oil pump when the primary drive source is started and remains inactive for a predetermined time, executing a state diagnosis during this active period to minimize discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If state diagnosis is executed at predetermined time intervals, then diagnosis reliability is improved, but the electric oil pump is driven unnecessarily causing driver discomfort
Solution Approach 1:
The system executes the state diagnosis of the electric oil pump at a predetermined time point after the engine is started, before normal operation begins. This preliminary timing ensures diagnosis reliability is maintained while avoiding unnecessary pump operation during driving, thereby reducing driver discomfort.
2Object-affected harmful factors
If state diagnosis is executed at drive timing, then driver discomfort is reduced, but diagnosis opportunities are missed when there is no drive request
Solution Approach 1:
The diagnosis is performed at a predetermined time point after engine start, which is before any drive request may occur. This timing guarantees that diagnosis opportunities are not missed while the pump is driven, ensuring both diagnosis reliability and minimal driver discomfort.
3Reliability
If the electric oil pump is driven for a longer time to ensure diagnosis completion, then diagnosis reliability is improved, but driver discomfort increases
Solution Approach 1:
By executing the diagnosis at a predetermined time point after engine start, the system completes the diagnosis before any drive request occurs. This eliminates the need to extend pump operation beyond what is necessary for diagnosis, thereby maintaining diagnosis reliability while minimizing pump drive time and driver discomfort.
Data Source
AI summary
[PROBLEMS] To enable execution of a state diagnosis for an electric oil pump while reducing a sense of discomfort given to a driver.[SOLUTIONS] Provided is a vehicle control device that controls a vehicle including an automatic transmission, the automatic transmission including a first oil pump driven by a first drive source that drives a drive wheel and a second oil pump driven by a second drive source, wherein the vehicle control device drives the second oil pump when the first drive source is started, and drives the second oil pump when a time during which the second oil pump is not driven after the first drive source is started continues for a predetermined time or longer, and a drive time for the second oil pump when the first drive source is started is longer than a drive time when the time during which the second oil pump is not driven continues for the predetermined time or longer.