Vehicle Control Device Quick-Apply Timing After Pulsation Drive
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Solution Overview
Problem
The operation delay of a pressure control solenoid valve in a vehicle's hydraulic friction engagement device can lead to reduced drivability due to unstable hydraulic pressure and delayed quick-apply control, especially after pulsation drive control termination.
Innovation Solution
A control device that includes a pulsation drive control portion and a quick-apply control prohibiting portion, where the pulsation drive control is terminated upon a shift request, and the quick-apply control is permitted only after a predetermined time has elapsed since the termination of the pulsation drive control, allowing for earlier initiation of quick-apply control and reducing operation delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the quick-apply control is delayed until the hydraulic pressure becomes stable after pulsation drive control termination, then the risk of stroke hit is reduced, but the shift response time increases and drivability deteriorates
Solution Approach 1:
The pulsation drive control is terminated in advance when a shift request is detected, before the quick-apply control is executed. This preliminary termination allows the hydraulic pressure to stabilize earlier, so that when the quick-apply control is subsequently activated, the pressure is already stable, avoiding both stroke hit and delay in shift response
Solution Approach 2:
The control system dynamically adjusts the timing of pulsation drive control termination based on the detection of shift requests. By making the termination timing flexible and conditional rather than fixed, the system optimizes the balance between pressure stabilization and quick-apply response time
2Stability of the object's composition
If the pulsation drive control is continued until the shift output signal is output, then the hydraulic pressure stabilization is ensured, but the quick-apply control starts later reducing drivability
Solution Approach 1:
The pulsation drive control is terminated preliminarily when a shift request is detected, before the shift output signal is output. This early termination initiates the hydraulic pressure stabilization process in advance, allowing the system to maintain both pressure stability and fast shift execution by separating the stabilization initiation from the actual shift command
Data Source
AI summary
A vehicle control device including a multi-speed transmission switching gear shift positions in accordance with a combination of hydraulic friction engagement devices operations and pressure control solenoid valves, the control device shifting gears by providing a shift output signal including a quick-apply signal to the valves after a first time from a shift request, the control device has: a pulsation drive control portion to control selectively pulsating the pressure control solenoid valves in a cycle; and a quick-apply control prohibiting portion to prohibit a provision of a quick-apply control using the quick-apply signal for a second time from a time of termination of the pulsation drive control, and to permit the provision of the quick-apply control after the elapse of the second time, for a valve having undergone the control, the pulsation drive control portion to terminate the control for a valve when the shift request is made.