JPH031269U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a diagram corresponding to the claims of the invention, Fig. 2 is a system configuration diagram of the entire engine control device according to an embodiment of the invention, and Fig. 3 is a structure of the air control valve section of the device. 4 is a functional block diagram showing the secondary air supply control function of the device, FIG. 5 is a flowchart of the main routine showing the exhaust gas temperature reduction control operation of the device, and FIGS. FIG. 7 is a partial chart showing the flow steps of a modified example in which a part of the flow chart of FIG. 5 is modified, and FIG. 8 is an operating range map showing the overall secondary air control range of the same device , FIG. 9 is a time chart corresponding to the control operation of the same device shown in FIG. 5, and FIG. 10 is a time chart corresponding to the control operation of the same device shown in FIG.
This is a time chart corresponding to the control operation shown in the figure. 1...Rotary piston engine body, 2, 3
... Trochoid space, 4, 5 ... Rotor housing, 6, 8 ... Side housing, 7 ... Intermediate housing, 10, 11 ... Rotor, 13A to 13C, 14A to 14C ... Working chamber,
19...Exhaust pipe, 21, 22...Main intake port,
25...Intake recirculation passage, 26...Opening/closing control valve, 4
0...Opening/closing valve actuator, 41...Duty solenoid, 45...Air flow meter, 46
...throttle valve, 47...throttle opening sensor, 48...acceleration sensor, 50...engine control unit, 51...first catalytic converter, 52...second catalytic converter, 53...first catalytic converter Secondary air supply nozzle, 54...Second secondary air supply nozzle, 55...Air pump, 60...2
Next air main supply path, 75...first solenoid valve, 8
9...Second solenoid valve, 102...Area determination circuit,
107...Solenoid valve control circuit.

Claims (1)

[Scope of utility model registration request] In an engine comprising an air pump driven by the engine and a secondary air supply means using the air pump to supply secondary air to an exhaust port of the engine, the engine is in a predetermined high rotational state. an engine rotation speed detection means for detecting a transition from the high rotation state to an idle rotation state; and when the engine rotation speed detection means detects a transition from the high rotation state to the idle rotation state, the engine is operated at a temperature of exhaust gas. 1. A control device for an engine, comprising: an engine control means for controlling the engine in a direction in which the engine decreases.