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Controller for one-cylinder four-circulation motor

An engine and controller technology, applied in the direction of engine components, engine ignition, machine/engine, etc., can solve the problem of limited position of the eroded teeth part of the signal rotor

Active Publication Date: 2007-07-11
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the position of the eroded tooth portion of the signal rotor is limited

Method used

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  • Controller for one-cylinder four-circulation motor
  • Controller for one-cylinder four-circulation motor
  • Controller for one-cylinder four-circulation motor

Examples

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no. 1 example

[0018] Hereinafter, an embodiment for carrying out the present invention will be described with reference to the accompanying drawings. This embodiment configures an engine control system for a 4-cycle single-cylinder gasoline engine of a motorcycle. In this engine control system, an electronic control unit (hereinafter, referred to as "ECU") performs ignition timing control and the like. Referring to Fig. 1, a general schematic structure of the engine control system will be described below.

[0019] The intake port of the engine 10 has an intake valve 11 fitted therein and an intake pipe 12 connected thereto. An electromagnetic fuel injection valve 13 is fitted near the intake port of the intake pipe 12, and fuel is supplied to the fuel injection valve 13 from a fuel supply system (not shown). In addition, the exhaust port of the engine 10 has an exhaust valve 14 fitted therein, and an exhaust pipe 15 connected thereto. In this structure, when the intake valve 11 is opened...

no. 2 example

[0039] In the second embodiment, the same stroke determination as shown in FIG. 3 is performed every time the crankshaft 19 is rotated once, and the determination result thereof is provided to various engine controls as a provisional result. This determination result is selected when a plurality of correct stroke determinations are performed consecutively. FIG. 4 shows the processing procedure of stroke determination in this embodiment. In FIG. 4, the same processing as in FIG. 3 is denoted by the same step number. This description will focus on the differences between them.

[0040] In the stroke determination process shown in FIG. 4, when the stroke determination is correctly performed, and the stroke determination is performed continuously for a designated number of times K3 (4 times in this embodiment), the determination result is selected, and the determination counter is used C, counting the number of strokes determined. The determination counter C is initialized to 0...

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Abstract

In a single cylinder 4-cycles engine (10), when a winch shaft (19) rotates a circuit, the rotary speed is not even. As for each stroke, different time (T30) is needed for the winch shaft (19) rotating special winch angle. Especially, for each stroke, time (T30) needed by rotation has different variation trend. Time (T30) for winch angle Cn=8, 9 is acquired, and time difference ( Delta T30) of time (T30) needed by rotation is calculated (step S109). Then the time difference ( Delta T30) is compared with determined value K1 and K2 of predetermined stroke (step S110, S109) to determine which stroke is the current stroke(step S111, S114).

Description

technical field [0001] This invention relates to controllers for single cylinder four cycle engines and, more particularly, to controllers for making stroke determinations for the engine. Background technique [0002] In a four-cycle engine, an intake stroke, compression stroke, power stroke, and exhaust stroke are performed sequentially to complete one cycle of its internal combustion engine. That is, in a 4-cycle engine, when the crankshaft rotates two revolutions, one cycle of the combustion cycle is completed. For this reason, it is impossible to determine which of the strokes the current stroke is by only detecting the rotation angle of the crankshaft. When it is impossible to determine which of the strokes the current stroke is, when fuel injection control or ignition timing control is performed, it is impossible to control the timing, and therefore, it is impossible to control the drive engine in a suitable and proper manner. [0003] In a conventional control syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02P7/067
Inventor 大河内康宏
Owner DENSO CORP