Electric Vehicle Push-Walk Control Logic
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Solution Overview
Problem
Existing electrically-driven vehicles, such as scooters, lack a mechanism to ensure that the push-walk function is only activated under specific conditions, leading to unintended speed reductions during normal traveling when the push-walk switch is engaged at inappropriate times, such as high speeds.
Innovation Solution
An electrically-driven vehicle with a control system that receives instructions from a push-walk switch and only activates the push-walk function when the vehicle speed is below a preset value, preventing the push-walk mode from engaging unless the throttle is opened to a specific value or less, thus maintaining normal traveling speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the push-walk function is activated during usual traveling, then the vehicle speed is reduced to walking speed, but the driving force of the electrically-operated motor is changed and normal traveling is disrupted
Solution Approach 1:
The control part monitors vehicle speed and throttle opening as parameters, and only permits push-walk mode when speed is below a predetermined value and throttle opening is within acceptable range. This parameter-based gating ensures push-walk is only activated under appropriate conditions, preventing disruption to normal traveling.
Solution Approach 2:
The control part continuously receives feedback from speed and throttle sensors, and uses this feedback to determine whether to permit or prohibit push-walk mode. This closed-loop control ensures that push-walk function is only available when vehicle state satisfies preset conditions, maintaining traveling stability.
2Ease of operation
If the push-walk switch is manipulated during high speed traveling, then unintended speed reduction occurs, but the rider may not intend to activate push-walk mode
Solution Approach 1:
The control part preemptively prohibits push-walk mode when vehicle speed exceeds the predetermined value, preventing unintended speed reduction before it can occur. This preliminary protective action blocks the push-walk function activation under inappropriate conditions.
Solution Approach 2:
The system uses vehicle speed as a gating parameter, only permitting push-walk mode when speed is below the predetermined threshold. This parameter-based control prevents accidental activation during high-speed traveling while maintaining switch responsiveness when conditions are appropriate.
3Adaptability or versatility
If the push-walk function is allowed without throttle position check, then push-walk may activate during throttle opening, but this disrupts the relationship between throttle input and vehicle speed
Solution Approach 1:
The control part monitors throttle opening as a critical parameter and only permits push-walk mode when throttle opening is below a predetermined value. This ensures that push-walk activation does not occur during throttle input, maintaining the predictable relationship between throttle position and vehicle speed.
Solution Approach 2:
The system continuously monitors throttle position as feedback and uses this information to gate the push-walk function. This feedback mechanism ensures that push-walk mode is only available when throttle opening is within acceptable range, preserving throttle control predictability.
Data Source
AI summary
To provide an electrically-driven vehicle which does not impede the usual traveling even when a push-walk function is used. A motor is provided for driving a drive wheel with a battery supplying electric power to the motor. A throttle is provided for adjusting a vehicle speed and a battery control unit controls the motor based on an output of the throttle. The electrically-driven vehicle further includes a push-walk switch operated by a rider for selecting the push-walk traveling and, at the same time, the battery control unit also performs the detection of a vehicle state. The battery control unit performs the control of the push-walk traveling when the battery control unit receives the instruction of the push-walk switch via a rider and a vehicle state satisfies a preset condition.