Straddle-type vehicle and combustion controller for straddle-type vehicle
First Claim
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1. A straddle-type vehicle, comprising:
- a vehicle body frame;
an engine mounted on the vehicle body frame;
a combustion adjusting device for adjusting a combustion condition of the engine; and
a combustion controller for controlling the combustion adjusting device such that during a predetermined period, during which a plurality of combustion cycles occur, maximum points of a sound pressure level waveform of an audible sound wave generated from the engine are generated, each of the maximum points corresponding to a maximum intensity of the sound pressure level waveform during one of the combustion cycles so that each of the combustion cycles has a respective maximum point of the maximum points, during the predetermined period, the maximum points being shifted from each other by at least a predetermined amount so as to cause an irregular timing of the maximum points.
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Abstract
A straddle-type vehicle 30 includes a vehicle body frame 31, an engine 1 mounted on the vehicle body frame 31, combustion adjusting devices (fuel injection valves) 14 and 15 for adjusting the combustion condition of the engine 1, and a combustion controller (ECU) 22 for controlling the fuel injection valves 14 and 15. The ECU 22 controls the fuel injection valves 14 and 15 such that the maximum point of a sound pressure level waveform of an audible sound wave generated from the engine 1 or the vehicle body frame 31 is shifted by a predetermined amount or larger within a predetermined period at least in some of the operation conditions of the engine 1.
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Citations
22 Claims
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1. A straddle-type vehicle, comprising:
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a vehicle body frame; an engine mounted on the vehicle body frame; a combustion adjusting device for adjusting a combustion condition of the engine; and a combustion controller for controlling the combustion adjusting device such that during a predetermined period, during which a plurality of combustion cycles occur, maximum points of a sound pressure level waveform of an audible sound wave generated from the engine are generated, each of the maximum points corresponding to a maximum intensity of the sound pressure level waveform during one of the combustion cycles so that each of the combustion cycles has a respective maximum point of the maximum points, during the predetermined period, the maximum points being shifted from each other by at least a predetermined amount so as to cause an irregular timing of the maximum points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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- 12. A combustion controller for a straddle-type vehicle which controls a combustion adjusting device for adjusting a combustion condition of an engine mounted on a vehicle body frame, wherein the combustion controller controls the combustion adjusting device such that during a predetermined period, during which a plurality of combustion cycles occur, maximum points of a sound pressure level waveform of an audible sound wave generated from the engine are generated, each of the maximum points corresponding to a maximum intensity of the sound pressure level waveform during one of the combustion cycles so that each of the combustion cycles has a respective maximum point of the maximum points, during the predetermined period, the maximum points being shifted from each other by at least a predetermined amount so as to cause an irregular timing of the maximum points.
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14. A straddle-type vehicle, comprising:
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a vehicle body frame; an engine mounted on the vehicle body frame; a combustion adjusting device for adjusting a combustion condition of the engine; and a combustion controller for controlling the combustion adjusting device such that during a predetermined period, during which a plurality of combustion cycles occur, maximum points of a sound pressure level waveform of an audible sound wave generated from the engine are generated, each of the maximum points corresponding to a maximum intensity of the sound pressure level waveform during one of the combustion cycles so that each of the combustion cycles has a respective maximum point of the maximum points, during the predetermined period, the maximum points being shifted from each other by at least a predetermined amount so as to cause the maximum points to have different intensities from each other. - View Dependent Claims (15, 16, 17, 18)
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- 19. A combustion controller for a straddle-type vehicle which controls a combustion adjusting device for a combustion condition of an engine mounted on a vehicle body frame, wherein the combustion controller controls the combustion adjusting device such that during a predetermined period, during which a plurality of combustion cycles occur, maximum points of a sound pressure level waveform of an audible sound wave generated from the engine are generated, each of the maximum points corresponding to a maximum intensity of the sound pressure level waveform during one of the combustion cycles so that each of the combustion cycles has a respective maximum point of the maximum points, during the predetermined period, the maximum points being shifted from each other by at least a predetermined amount so as to cause the maximum points to have different intensities from each other.
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21. A straddle-type vehicle, comprising:
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a vehicle body frame; an engine mounted on the vehicle body frame; a combustion adjusting device for adjusting a combustion condition of the engine; and a combustion controller for controlling the combustion adjusting device such that during a predetermined period, during which a plurality of combustion cycles occur, maximum points of a sound pressure level waveform of an audible sound wave generated from the engine are generated, each of the maximum points corresponding to a maximum intensity of the sound pressure level waveform during one of the combustion cycles so that each of the combustion cycles has a respective maximum point of the maximum points, during the predetermined period, the maximum points being shifted from each other by at least a predetermined amount so that in each of the respective combustion cycles, an intensity of the respective maximum point of the respective combustion cycle is different than one of an intensity of the respective maximum point of a directly following one of the combustion cycles that directly follows the respective combustion cycle, and an intensity of the respective maximum point of a directly preceding one of the combustion cycles that directly precedes the respective combustion cycle.
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22. A straddle-type vehicle, comprising:
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a vehicle body frame; an engine mounted on the vehicle body frame; a combustion adjusting device for adjusting a combustion condition of the engine; and a combustion controller for controlling the combustion adjusting device such that during a predetermined period, during which a plurality of combustion cycles occur, maximum points of a sound pressure level waveform of an audible sound wave generated from the engine are generated, each of the maximum points corresponding to a maximum intensity of the sound pressure level waveform during one of the combustion cycles so that each of the combustion cycles has a respective maximum point of the maximum points, during the predetermined period, the maximum points being shifted from each other by at least a predetermined amount so that in each of the respective combustion cycles, a timing of the respective maximum point with respect to the respective combustion cycle is different than one of a timing of the respective maximum point of a directly following one of the combustion cycles that directly follows the respective combustion cycle, with respect to the directly following one combustion cycle, and a timing of the respective maximum point of a directly preceding one of the combustion cycles that directly precedes the respective combustion cycle, with respect to the directly preceding one combustion cycle.
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Specification