Engine Controller Delayed Ignition Timing Control
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Solution Overview
Problem
Prior-art engine controllers fail to maintain delayed ignition timing control when the throttle opening degree exceeds ½ or the gear position exceeds third gear, forcing riders to maintain a low throttle position for improved tire grip, which strains the rider and limits vehicle acceleration.
Innovation Solution
An engine controller with a start determinator, elapsed time timer, and start controller that adjusts engine output based on gear position, rotation speed, and throttle opening degree, allowing for delayed ignition timing control even with increased throttle opening, and notifies the rider through an indicator lamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If delayed ignition timing control is applied to improve tire gripping performance at start, then traction is improved, but the control is cancelled when throttle opening exceeds 1/2 or gear position exceeds third gear, preventing full acceleration performance
Solution Approach 1:
The invention changes the control parameters from fixed threshold-based conditions (throttle opening ≤ 1/2, gear ≤ third) to time-based control (elapsed time since start detection). This allows the delayed ignition timing control to continue for a predetermined duration regardless of throttle position or gear changes, enabling riders to fully open the throttle for maximum acceleration while maintaining improved traction during the critical start phase.
2Productivity
If riders open the throttle large at start to achieve fast acceleration, then acceleration performance is improved, but the delayed ignition timing control is cancelled and tire gripping performance deteriorates
Solution Approach 1:
The invention applies preliminary action by implementing delayed ignition timing control from the moment start is detected, before any throttle position changes occur. This pre-established control continues for a predetermined elapsed time, ensuring tire gripping performance is maintained during the critical acceleration phase regardless of how quickly or fully the rider opens the throttle.
3Reliability
If riders maintain throttle opening at 1/2 or less to continue delayed ignition timing control, then tire gripping performance is improved, but mental strain increases and acceleration performance is restricted
Solution Approach 1:
The invention implements self-service by making the control system automatically manage the delayed ignition timing based on elapsed time since start detection, without requiring continuous rider input or monitoring. The ECU autonomously maintains the control until the predetermined time elapses or stop conditions are met, freeing the rider from the burden of maintaining specific throttle positions and eliminating mental strain.
4Productivity
If delayed ignition timing control is maintained for extended period, then acceleration performance is fully utilized, but energy consumption increases
Solution Approach 1:
The invention applies periodic action by implementing delayed ignition timing control for a predetermined elapsed time period after start detection, rather than continuously. The control is automatically terminated when the time period expires or when stop conditions are met (gear shift to fourth or higher, engine speed exceeding upper limit, throttle closing below lower limit). This time-limited approach ensures full acceleration performance during the critical start phase while avoiding unnecessary energy consumption during steady-state operation.
Data Source
AI summary
An engine controller is proposed which facilitates an operation at start of a vehicle without forcing mental strain to a rider to cancel start control. An engine controller includes a start determinator for determining start of a vehicle, an elapsed time after start timer for counting elapsed time Tp since start of the vehicle is determined by the start determinator, and a start controller for adjusting an output of an engine until the elapsed time Tp counted by the elapsed time after start timer reaches a predetermined control time Tr determined in advance if the start of the vehicle is determined by the start determinator.