Engine control device

Abstract

An engine control device capable of detecting an acceleration state by using the phase of a crankshaft and an intake pressure so that an acceleration feeling can be provided accordingly, wherein the state of strokes is detected by using the rotating angle of the crankshaft and the intake pressure, pressure differences between intake pipe pressures detected at specified crank angles in an exhaust stroke and an intake stroke and intake pipe pressures detected at the same crank angles in the same strokes of a previous cycle are calculated as intake pressure differences DELTAPA-MIN, the calculated values are compared with thresholds set for the crank angles and, when the compared values are equal to or more than the thresholds, an engine is considered to be in an accelerated state, and the injected amount of fuel at the time of acceleration is immediately added to the injected amount of fuel in stationary state and then injected, the injected amount of fuel in stationary state can be provided by detecting an intake air volume by using the intake pressure, and the volume of an air / fuel passage ranging from a throttle valve to an intake port is made equal to or less than a piston displacement to increase the detection accuracy of the acceleration state and the intake air volume.

Description

technical field [0001] The invention relates to an engine control device for controlling an engine, especially suitable for the control of an engine having a fuel injection device for injecting fuel. Background technique [0002] In recent years, with the popularization of fuel injection devices called injectors, the timing of fuel injection and the amount of injected fuel, that is, the control of the air-fuel ratio has become easier, and it has been possible to promote high output, low fuel consumption, and exhaust gas. cleaning etc. Among them, especially regarding the timing of fuel injection, it is generally necessary to strictly detect the state of the intake valve, that is, detect the phase state of the camshaft, and inject fuel in accordance with it. However, a so-called cam sensor for detecting the phase state of a camshaft is expensive, and especially in a two-wheeled vehicle, there are problems such as increasing the size of the cylinder head, so it cannot be used...

AI Technical Summary

Problems solved by technology

That is to say, during the period up to the following cycle, for example, even if the driver opens the throttle valve to accelerate, the air-fuel ratio control is still performed according to the previous target air-fuel ratio, so the torque and output commensurate with the acceleration cannot be obtained. , and become a sense of incongruity that cannot get a sufficient sense of acceleration

In order to solve such a problem, a throttle valve sensor and a throttle position sensor that detects a throttle state can be used to detect the driver's acceleration intention, but especially in the case of a two-wheeled vehicle, these sensors cannot be used due to their large size or high cost. Adoption, so the problem has not been solved so far

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