Fuel Injection Control Device for Saddle-Ride Vehicles
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Solution Overview
Problem
Existing fuel injection control devices for saddle-ride type vehicles face challenges in rapidly reflecting acceleration requests from drivers without increasing the number of parts, particularly when the calculation timing of the basic injection amount coincides with the toothless position of the crank pulsar rotor, leading to delayed detection of throttle opening changes and potential lean spike phenomena.
Innovation Solution
A fuel injection control device that includes a throttle opening read timing setter, which triggers detection of the throttle opening based on crank pulse interrupts for positions other than the toothless part, ensuring timely reflection of acceleration requests and preventing lean spikes by reading the throttle opening at the activation of FICAL, even at the toothless position, and adjusting the additional injection amount based on throttle opening changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the calculation timing of the basic injection amount is set at the toothless position of the crank pulsar rotor, then the engine rotational speed can be detected, but the throttle opening detection is delayed causing acceleration requests to be reflected slowly
Solution Approach 1:
The system performs preliminary detection of the throttle opening at the toothless position before the calculation timing occurs. By detecting the throttle opening in advance when the crank pulsar rotor is at the toothless position, the system ensures that the throttle opening information is ready for use in the basic injection amount calculation, eliminating detection delays and enabling rapid response to acceleration requests.
2Reliability
If the throttle opening is detected based on crank pulse interrupt, then the detection is reliable, but the detection timing may not coincide with the calculation timing of basic injection amount
Solution Approach 1:
The system performs preliminary detection of the throttle opening at the toothless position before the calculation timing occurs. By detecting the throttle opening in advance when the crank pulsar rotor is at the toothless position, the system ensures that the throttle opening information is ready for use in the basic injection amount calculation, eliminating detection delays and enabling rapid response to acceleration requests.
3Speed
If the number of parts is increased to improve throttle opening detection timing, then the response speed can be improved, but the device complexity increases
Solution Approach 1:
The system performs preliminary detection of the throttle opening at the toothless position before the calculation timing occurs. By detecting the throttle opening in advance when the crank pulsar rotor is at the toothless position, the system ensures that the throttle opening information is ready for use in the basic injection amount calculation, eliminating detection delays and enabling rapid response to acceleration requests.
Solution Approach 2:
The existing crank pulsar rotor structure is utilized to determine detection timing. The toothless position of the crank pulsar rotor, which is already present in the system for rotational speed detection, is leveraged to trigger throttle opening detection automatically without requiring additional sensors or components. This self-service approach enables rapid response while maintaining device simplicity.
Data Source
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AI summary
The present invention provides a fuel injection control device of a saddle-ride type vehicle that can rapidly reflect an acceleration request of the user with the number of parts reduced as with the related art although making a stroke determination of the internal combustion engine by a crank pulse. The fuel injection control device includes a throttle opening read timing setter (162) that sets the timing at which a throttle opening (TH) is read. The throttle opening read timing setter (162) is triggered to detect the throttle opening (TH) used for calculation of a basic injection amount by the start of calculation timing of the basic injection amount (FICAL) if the injection amount calculation timing (FICAL) is at the position corresponding to a toothless part (24) of a crank pulsar rotor (20). The throttle opening read timing setter (162) detects the throttle opening TH based on crank pulse interrupt according to a crank pulse (PCP) if the injection amount calculation timing (FICAL) is at a position other than the position corresponding to the toothless part (24).