Vehicle Control System Learning Control Strategy
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Solution Overview
Problem
During travel economy running control, the learning control of the electric pump can lead to erroneous learning due to unstable oil pressure caused by gear shifting and centrifugal pressure changes, which is not considered in existing stopped economy running control systems.
Innovation Solution
A vehicle control system that executes learning control only during stopped economy running control to ensure stable oil pressure and prohibits learning during travel economy running control, allowing the travel economy running control only when the oil pressure is above a certain target value or when the learning is complete.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If learning control is executed during travel economy running control, then the learning effect is enhanced, but erroneous learning occurs due to unstable oil pressure from gear shifting and centrifugal pressure changes
Solution Approach 1:
The patent applies local quality by differentiating the learning control execution conditions based on the vehicle state. Learning control is permitted only during stopped economy running control (when the vehicle is stationary), but prohibited during travel economy running control (when the vehicle is moving). This spatial/temporal differentiation ensures that learning occurs only in the stable oil pressure environment of stopped state, avoiding the unstable conditions during travel with gear shifting and centrifugal effects.
Solution Approach 2:
The patent changes the operational parameter (learning control execution status) based on the vehicle state parameter (stopped vs. traveling). By monitoring whether the vehicle is in stopped economy running control or travel economy running control, the system dynamically adjusts whether learning control is permitted, thereby adapting the learning process to the stability of oil pressure conditions.
2Use of energy by moving object
If travel economy running control is executed before learning completion, then fuel efficiency is improved, but drivability deteriorates due to insufficient oil pressure control
Solution Approach 1:
The patent applies preliminary action by requiring that learning control be completed before permitting travel economy running control. The system first executes learning control during stopped economy running control to establish accurate characteristics data, and only after this learning is complete does it allow travel economy running control to begin. This preliminary learning ensures that the oil pressure control is optimized before the vehicle enters the travel state.
Solution Approach 2:
The patent applies preliminary anti-action by prohibiting travel economy running control until learning is complete. This preventive measure avoids the harmful effect of poor drivability that would occur if travel economy running control were executed with inaccurate pump characteristics, thereby preventing the problem before it can manifest.
Data Source
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AI summary
A vehicle control system according to the present invention includes: an engine (3); a power transmission device (5) that transmits power from the engine (3) to drive wheels (4); a mechanical pump (31) that supplies oil for operating the power transmission device (5) to the power transmission device (5) by driving of the engine (3); and an electric pump (33) that supplies the oil to the power transmission device (5) by driving of a motor (32). In addition, this vehicle control system is capable of executing stopped economy running control for stopping the engine (3) when a vehicle is stopped, and travel economy running control for stopping the engine (3) while the vehicle is traveling. This vehicle control system is configured such that, during the execution of the stopped economy running control, learning control is executed whereby a control value for controlling the oil pressure is updated such that the actual oil pressure generated by the electric pump (33) is converged to a target value but during the execution of the travel economy running control the learning control is prohibited. Thus, it is possible to prevent erroneous learning of characteristics of the electric pump.