Vehicular Drive Control Clutch Timing Detection
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Solution Overview
Problem
Existing vehicular drive control systems face challenges in quickly and smoothly transitioning from a power interruption state to a power transmittable state, leading to delayed torque response due to the inability to accurately determine the timing of clutch application, which is often reliant on timer control and varies with vehicle conditions.
Innovation Solution
A vehicular drive control apparatus and method that includes an electric differential portion and a shifting portion, where the rotation speed of the transmitting member is controlled to achieve a predetermined rotation speed difference or ratio between the transmitting member and the input rotating member, allowing for precise detection of clutch application timing and enabling quick and smooth torque response through sweep control of the apply device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If timer control is used to determine clutch application timing, then the control system is simple to implement, but the torque response is delayed due to variation in apply time
Solution Approach 1:
The patent uses feedback from rotation speed sensors to detect the actual clutch application timing. The control system continuously monitors the rotation speed of the transmitting member and input rotating member, and uses this feedback information to precisely determine when the clutch is applied, eliminating the need for conservative timer control and improving torque response.
Solution Approach 2:
The patent replaces the mechanical/timer-based control system with an electronic control system that uses sensors and electronic processing. Rotation speed sensors detect the actual clutch application timing, and an electronic control unit processes this information to determine apply timing, substituting the crude timer mechanism with a precise electronic detection and control system.
2Productivity
If the power transmitting path is changed quickly from non-drive to drive state, then productivity is improved, but shift shock increases
Solution Approach 1:
The patent applies preliminary action by controlling the rotation speed of the transmitting member before clutch application. The system pre-adjusts the rotation speed to match the input rotating member, ensuring that when the clutch is applied, the speed difference is minimized, thereby reducing shift shock while enabling quick power transmission.
Solution Approach 2:
The patent changes the rotation speed parameter of the transmitting member as a function of time before clutch application. By dynamically adjusting the rotation speed to converge with the input rotating member speed, the system enables rapid shift operation while minimizing the harmful effect of shift shock through controlled parameter transition.
3Object-generated harmful factors
If completely synchronous speed control is applied to the transmitting member, then shift shock is reduced, but the apply timing cannot be determined from rotation speed change
Solution Approach 1:
The patent applies partial synchronous speed control rather than complete synchronous control. By controlling the transmitting member speed to partially converge with the input rotating member speed (but not exactly match it), the system achieves reduced shift shock while maintaining a detectable rotation speed difference that allows precise determination of clutch application timing.
Data Source
AI summary
A rotation speed of a transmitting member is controlled such that a predetermined rotation speed difference or predetermined rotation speed ratio is obtained between the rotation speed of the transmitting member and an eighth rotating element or a fourth rotating element. By detecting a change in the rotation speed of a second motor that is connected to the transmitting member when an apply device is applied, it is possible to determine the time at which a first clutch or a second clutch starts to be applied and the time at which the first clutch or the second clutch is completely applied. As a result, it is possible to control the apply pressure of the first clutch or the second clutch and thus rapidly execute a shift.