Abstract: A batch type raw material mixing method and apparatus for obtaining a viscous material from a plurality of kinds of raw materials of different properties, in which the materials are placed in a cylindrical container and agitated by agitating blades, the rotational speed of which is switched cyclically between a high level and a low level. The apparatus comprises a cylindrical container for holding the raw materials therein, agitating blades provided rotatably in the cylindrical container, a driving device for rotating the agitating blades, and a control unit for controlling the cyclic switching of the rotational speed of the agitating blades between a high level and a low level.

Abstract: When the engine throttle valve is closed or very nearly closed, the induction vacuum assumes a level whereat the flow of exhaust gas through the EGR conduit can be induced to assume a sonic level and maximize. Under these conditions, by opening the EGR control valve and checking the change in induction pressure, the amount of recirculation can be monitored in a manner which enables partial EGR conduit blockage and/or similar types of malfunctions to be detected.

Abstract: There is disclosed a process for preparing a one-component type sealant, comprising the steps of mixing powdery raw material such as prepolymer and additives admixed or not admixed with a predetermined amount of plasticizer in a mixer in a hermetically closed system, continuously degassing the mixed pasty material in a degassing line, and mixing the degassed mixture with catalyst admixed or not admixed with plasticizer.

Abstract: One analog signal is selected out of a plurality of analog signals by a multiplexer and a capacitor is electrically charged though such a switch as adapted to be closed/opened by a start signal, and thereafter the capacitor is caused to discharge with a constant current with the switch opened. A level discriminating signal is led out when a voltage of the capacitor discharging goes below a predetermined discriminating level after the switch is opened. A stop signal is generated as a result of a logical operation of the analog signal and the level discriminating signal by an AND gate. A processing circuit accepts the stop signal and calculates a digital value corresponding to a time period from the time that the switch is opened to the time that the level discriminating signal is generated, and then moves to a subsequent processing operation.