Motorcycle ACC Brake-to-Drive Transition Shock Control
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Solution Overview
Problem
Adaptive cruise control in straddle-type vehicles, such as motorcycles, causes discomfort due to shocks occurring when the drive wheel starts being driven, as existing systems fail to manage the transition effectively, leading to reduced driver comfort.
Innovation Solution
A controller that generates a reference braking force on the drive wheel at the point of power transmission from the drive source, balancing acceleration performance with shock alleviation by controlling the braking force during the transition from braking to driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If adaptive cruise control automatically accelerates the straddle-type vehicle by driving the drive wheel, then the vehicle can travel according to distance from preceding vehicle and driver's instruction, but a shock occurs due to gear backlash when the drive wheel starts being driven, worsening driver comfort
Solution Approach 1:
The control section applies a preliminary braking force to the drive wheel before the drive source starts outputting drive power. This preliminary braking force counteracts the shock that would occur when the drive wheel suddenly starts rotating due to gear backlash, thereby preventing the harmful effect on driver comfort before it occurs.
Solution Approach 2:
The control section prepares the braking system in advance by applying a controlled braking force to the drive wheel before power transmission begins. This preliminary action ensures that when the drive source activates, the transition is smooth and shock-free, maintaining driver comfort during automated acceleration.
2Object-affected harmful factors
If a braking force is applied to the drive wheel to alleviate shock during power transmission, then driver comfort is improved, but acceleration performance may be affected
Solution Approach 1:
The control section dynamically adjusts the braking force based on real-time operating conditions. The braking force is applied only during the specific transition period when the drive wheel starts rotating, and its magnitude is optimized to minimize shock while having the least possible impact on acceleration performance. Once the drive wheel is fully engaged, the braking force is released.
Solution Approach 2:
The control section changes the braking force parameter dynamically during the power transmission transition. By adjusting the braking force magnitude and duration according to the specific moment of drive wheel activation, the system achieves optimal balance between shock reduction and acceleration performance maintenance.
Data Source
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AI summary
The present invention obtains a controller and a control method capable of securing a driver's comfort during adaptive cruise control for a straddle-type vehicle. In the controller and the control method according to the present invention, during the adaptive cruise control in which the straddle-type vehicle is made to travel according to a distance from the straddle-type vehicle to a preceding vehicle, motion of the straddle-type vehicle, and a driver's instruction, when a state where a braking force is generated on at least one of wheels of the straddle-type vehicle is switched to a state where a drive wheel is driven using drive power output from a drive source of the straddle-type vehicle, the braking force generated on the at least one of the wheels is controlled such that a reference braking force is generated on the drive wheel at a time point at which the drive wheel starts being driven due to transmission of the drive power output from the drive source to the drive wheel.