Clutch Control Device Torque Sensing Hunting
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Solution Overview
Problem
In low-speed traveling modes of vehicles, riders have difficulty sensing torque due to reduced oil pressure in the clutch, leading to a strange feeling as the engine rotates without noticeable torque variation compared to normal running states.
Innovation Solution
A clutch control device that introduces 'hunting' in the output torque by periodically varying the oil pressure at constant intervals, maintaining vehicle speed stability and ensuring the rider can sense torque without affecting speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If oil pressure to the clutch is reduced during low-speed traveling, then vehicle speed can be maintained at low levels, but the rider cannot sense torque variation
Solution Approach 1:
The controller performs periodic hunting control by adding a correction value to the target oil pressure at constant intervals, causing the output torque to increase and decrease repeatedly. This periodic variation in torque allows the rider to sense torque during low-speed traveling while maintaining low vehicle speed through the overall low oil pressure condition.
2Ease of operation
If hunting control is applied to produce torque variation, then the rider can sense torque, but vehicle speed control may be affected
Solution Approach 1:
The controller adds a correction value to the target oil pressure that is specifically designed not to affect vehicle speed. By carefully controlling the magnitude and timing of the correction value, the system produces torque variation for rider sensing while maintaining vehicle speed within the target range, thus resolving the contradiction between torque sensing and speed stability.
3Ease of operation
If torque variation is introduced through oil pressure correction, then rider torque sensing is enabled, but the control system complexity increases
Solution Approach 1:
The existing clutch control system, which already manages oil pressure for vehicle speed control, is extended to also provide torque sensing functionality. The same controller and oil pressure control mechanism are used for both maintaining vehicle speed and producing torque variation, eliminating the need for separate systems and reducing overall complexity.
Data Source
AI summary
To allow a rider to sense torque in a low-speed traveling mode, a control device has a forward-and-reverse clutch oil pressure controller. In a low-speed traveling mode, the forward-and-reverse clutch oil pressure controller performs hunting control on driving torque, which is transmitted to a rear wheel from a crankshaft of an engine through a clutch device, a transmission, and a drive shaft, if vehicle speed stays within a second vehicle speed range for a predetermined time.