Motorcycle Engine Reverse Rotation Preventive Device
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Solution Overview
Problem
Existing reverse rotation preventive devices for motorcycle engines often fail to allow immediate engine restart after a momentary rear wheel lock during braking, requiring the vehicle to be stopped for a new cranking operation, and in batteryless vehicles, the system struggles to cancel the reverse rotation preventive function when the crankshaft rotation is recovered.
Innovation Solution
A reverse rotation preventive device that includes a crank pulse rotor with reluctors, pulse generators, and a stage deciding unit to detect normal rotation, allowing the ignition to be reinstated when the crankshaft is in normal rotation, and selectively applying different predetermined times for the reverse rotation preventive function based on the supply voltage, ensuring the engine can be restarted without stopping the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reverse rotation preventive function is activated when the rear wheel locks during braking, then reverse rotation is prevented, but the engine cannot be restarted immediately when the brake is released
Solution Approach 1:
The reverse rotation preventive function is designed to dynamically adjust its state based on real-time detection of crankshaft rotation. When normal rotation is detected after being activated, the function automatically transitions from ignition inhibition to ignition enablement, allowing the engine to be restarted without stopping the vehicle. This dynamic adaptation resolves the contradiction between preventing reverse rotation and maintaining ease of operation.
Solution Approach 2:
The system continuously monitors crankshaft rotation and provides feedback to the reverse rotation preventive function. When the crankshaft rotates normally after the rear wheel unlocks, this feedback signal triggers the cancellation of the ignition inhibited condition, enabling immediate engine restart. The feedback mechanism ensures the system responds appropriately to changing operational conditions.
2Ease of operation
If the ECU power supply is turned off to cancel the reverse rotation preventive function in batteryless vehicles, then the function is canceled, but the generator may restart power supply before ECU voltage drops below reset voltage
Solution Approach 1:
The patent replaces the mechanical approach of turning off ECU power supply with an electronic control mechanism. The reverse rotation preventive function is canceled by detecting normal crankshaft rotation through pulse signals from the crank pulse rotor, rather than by cutting power to the ECU. This substitution eliminates the timing conflict between generator power supply restoration and ECU voltage reset, ensuring reliable function cancellation without compromising ignition inhibition status.
3Reliability
If the vehicle must stop for a new cranking operation to restart the engine, then the reverse rotation preventive function can be reset, but vehicle operation is interrupted
Solution Approach 1:
The system performs preliminary detection of normal crankshaft rotation and automatically cancels the ignition inhibited condition before the driver needs to perform any reset operation. This preliminary action allows the engine to be restarted immediately when the brake is released, maintaining vehicle operation continuity without requiring the driver to stop the vehicle for a new cranking operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the engine to be restarted smoothly without stopping the vehicle, even after the reverse rotation preventive function is activated due to rear wheel locking, and ensures reliable operation in batteryless vehicles by canceling the function when the crankshaft is in normal rotation, optimizing startability and convenience.
Implementation Method 1
a crank pulse rotor (50) which is provided with a plurality of reluctors (52) and which is rotated synchronously with a crankshaft (45) of an engine (9), and pulse generators (PC1, PC2) for outputting a pulse signal corresponding to an interval at which the reluctors (52) are arranged
Data Source
AI summary
A reverse rotation preventive device wherein an engine can be restarted without once stopping the vehicle even in the case where a reverse rotation preventive function is operated in response to momentary locking of a rear wheel. A plurality of reluctors are arranged at regular intervals, exclusive of a toothless part at one location with a crank pulse rotor rotated synchronously with a crankshaft of the engine, and a first and second pulse generators each of which outputs a pulse signal corresponding to the interval of the reluctors. Reverse rotation preventive means inhibits ignition of a spark plug by operating the reverse rotation preventive function when the interpulse time of the pulse signal exceeds a predetermined time and cancels the inhibition of the ignition when it is detected that a crankshaft is in normal rotation after the ignition is inhibited by the operation of the reverse rotation preventive function.