JPS6287178U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a basic conceptual diagram of the present invention, Figs. 2 to 8 are diagrams showing an embodiment of the present invention, Fig. 2 is a block diagram thereof, and Fig. 3 is a flowchart showing a program for detecting PTDC. Chart, Figure 4 shows the θp
5 is a flowchart showing a program for detecting _{θpmax 2 and} Pmax ₂ , FIG. ₆ is a flowchart showing a programmer for detecting misfire, FIG. 7a, b is a diagram showing in-cylinder pressure waveforms during normal combustion and abnormal combustion, and FIG. 8 is a flowchart showing a program for detecting θpmax. 1... Cylinder pressure sensor (pressure detection means), 3...
Sampling circuit (sampling means), 4...
Crank angle sensor (crank angle detection means), 5...
...first θpmax detection circuit (first calculation means), 6
...second θpmax detection circuit (second calculation means),
7...Top dead center pressure detection means (Top dead center pressure calculation means), 12...Ignition means, 15...Determination means, 16
...Ignition timing setting means.

Claims (1)

[Scope of Claim for Utility Model Registration] (a) Pressure detection means for detecting the cylinder pressure of the engine; (b) Crank angle detection means for detecting the crank angle of the engine; (c) Based on the output of the pressure detection means. (d) top dead center pressure calculation means for calculating the cylinder pressure at compression top dead center; (f) a first calculating means for calculating the in-cylinder pressure when the combustion pressure reaches its maximum before the crank angle, and detecting the crank angle at this time as the combustion peak position; (g) a first calculation means, a second calculation means, which calculates the in-cylinder pressure when the combustion pressure reaches a maximum after a predetermined crank angle, and detects the combustion peak position at this time; Based on the outputs of the means and the top dead center pressure calculating means, the state of change in the cylinder pressure is analyzed to determine whether or not there is abnormal combustion, and the first calculating means or the second calculating means is activated according to the result of this determination. (h) determining the ignition timing based on the operating state of the engine, and determining the ignition timing so that the combustion peak position is a predetermined position that maximizes the torque generated by the engine; An ignition timing control device for an engine, comprising: (i) ignition timing setting means for correcting the timing; and (i) ignition means for igniting an air-fuel mixture based on the output of the ignition timing setting means.