Transmission Control Apparatus Abnormality Handling
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Solution Overview
Problem
Existing transmission systems face challenges in smoothly performing shifting operations when a switching apparatus that switches discharging states of actuating oil is used, leading to inefficiencies and potential disruptions in engine revolution speed.
Innovation Solution
A control apparatus and method for a transmission system that includes a hydraulic pressure unit, a switcher for switching between full and partial discharge states, a control pressure adjusting valve, and an abnormality detector to maintain engine revolution speed above a higher limit value during abnormal conditions, ensuring smooth shifting operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a switching apparatus is used to switch discharging states of actuating oil, then the transmission system can improve shifting operation efficiency, but the system becomes vulnerable to switching failures that disrupt engine revolution speed
Solution Approach 1:
The control apparatus stores beforehand a map containing revolution speed lower limit values corresponding to different switching states (normal, 1st switch fixed, 2nd switch fixed). When a switching abnormality is detected, the controller immediately retrieves the appropriate lower limit value from this pre-stored map and applies it, avoiding any delay in response. This pre-preparation of control parameters ensures smooth transition during abnormal conditions.
Solution Approach 2:
The abnormality detection unit continuously monitors the switching apparatus and detects abnormalities in real-time. When an abnormality is detected, the controller receives this feedback and immediately adjusts the revolution speed lower limit value accordingly. This closed-loop feedback mechanism ensures the system responds dynamically to switching state changes and maintains appropriate engine control under abnormal conditions.
2Use of energy by moving object
If the switcher switches between full discharge state and partial discharge state, then the hydraulic pressure supply can be optimized, but switching abnormalities may cause insufficient control pressure
Solution Approach 1:
The control apparatus changes the revolution speed lower limit value parameter based on the detected switching state. When a switching abnormality is detected (partial discharge state), the system retrieves a higher lower limit value from the map compared to the normal full discharge state. This parameter adjustment ensures that the engine maintains sufficient revolution speed to generate adequate hydraulic pressure even when operating in a less efficient partial discharge mode.
3Reliability
If the revolution speed lower limit value is increased during abnormal conditions, then the hydraulic pressure can be maintained, but the engine operation becomes more restricted
Solution Approach 1:
The control apparatus dynamically adjusts the revolution speed lower limit value based on the actual switching state detected in real-time. The system transitions between different lower limit values corresponding to different switching states (normal, 1st switch fixed, 2nd switch fixed). This dynamic adaptation allows the engine operation restrictions to be optimized for each specific abnormal condition rather than applying a fixed restrictive limit.
Solution Approach 2:
The control apparatus applies different revolution speed lower limit values for different switching states. Each switching state (normal, 1st switch fixed, 2nd switch fixed) has its own specifically tailored lower limit value stored in the map. This localized approach ensures that the engine operation restrictions are precisely matched to the specific abnormal condition, applying the minimum necessary constraint for each scenario rather than a uniform restriction.
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
The solution enables the transmission system to maintain desired shifting operations even during abnormal conditions, such as when the switching apparatus is partially fixed, by adjusting control pressure and maintaining sufficient hydraulic pressure, thus improving user convenience and operational stability.
Implementation Method 1
a hydraulic pressure supply source 100 including a plurality of discharge ports 117A and 117B that discharge the actuating oil, and having a discharge rate of the actuating oil that is discharged from the plurality of discharge ports
Implementation Method 2
a control pressure adjusting valve 54 configured to adjust the control pressure that is derived from the actuating oil and that is to be applied to the hydraulic pressure unit
Data Source
AI summary
A control apparatus of a transmission includes the transmission that is configured to perform shifting operation with use of a control pressure derived from an actuating oil to be supplied to a hydraulic pressure unit. The control apparatus includes a hydraulic pressure supply source, a switcher, a control pressure adjusting valve, an abnormality detector, and a controller. The controller is configured to control the shifting operation of the transmission to keep a revolution speed of an engine, in an abnormal period in which an abnormality of the switcher is detected by the abnormality detector, at a value that is equal to or greater than an abnormal lower limit value. The abnormal lower limit value is higher than a normal lower limit value in a normal period. The normal period is prior to the detection of abnormality of the switcher by the abnormality detector.