PURPOSE:To perform quickly responsive and highly precise control, by measuring the fuel based on the number of injecting times of each particular crank angle with the aid of a reciprocating pump operative by an electrostriction effect CONSTITUTION:By the use of a unit injector 1 in which a piston type pump 103, employing an etectostriction type actuator 2, and a nozzle 112 positioned close thereto, are joined together, the amount of fuel injected is decided based on the number of injecting times commencing with a specified time, and this performs electrical control The amount of the air sucked by an airflow meter such as hot wire anemometers, the temperature of water by a water temperature sensor such as thermistors, oxygen concentration in exhaust gas by the O2 sensor, and the number of revolutions of an engine by the rotary disc of a cam shaft and an electromagnetic pickup are inputted to compute and process them, and by means of an output signal, the unit injector 1 mounted to a cylinder head is actuated

Fuel injector of internal-combustion engine

PURPOSE:To contrive energy saving by a method wherein heat exchange is effected between the inside air, discharged out of a drying chamber, and the outside air and air, introduced into the chamber, is switched to the inside air or the outside air in accordance with the condition of humidity of the inside air. CONSTITUTION:In the fore stage of drying a mold for coating, heat exchange is effected between inside air 30 after drying and the outside air in a heat exchanger 8, then, the inside air is discharged to the outside of a chamber to regulate the temperature and humidity of the outside air by a heat pump 6 after the heat exchange described before. The outside air is introduced into a drying chamber 1 to dry the mold 2 for coating. When the humidity of the inside air 30 in the drying chamber 1 is reduced to a predetermined value, heat exchange is effected in the heat exchanger 8 between the inside air 30 and the outside air, then, the temperature and humidity of the air are regulated by the heat pump 6 subsequently. Thereafter, the air is introduced into the drying chamber 1 again to effect drying.

Method and device for drying mold for coating by use of heat pump

PURPOSE:To set controllably air fuel ratio in a carbureter to a predetermined value accurately by detecting warming-up condition of an engine and sending control signal computed by a control circuit to an actuator provided in an air or fuel system of the carbureter. CONSTITUTION:A control circuit 400, upon receiving signal of a cooling water temperature sensor 104, sends control signal corresponding to water temperature value at that time to an actuator 300. Then a movement shaft 301 is displaced and controlling valves 303, 304 control the opening area to control air bleeding amount sent to main and low speed systems of a carbureter 200 through air bleed paths 204, 205 and vary fuel amount from a main fuel nozzle 203 and an injection port of the low speed fuel system for providing proper mixture to an engine body 100. When a cooling water temperature sensor 104 senses a temperature corresponding to warming- up running of the engine the control circuit 400 controls the opening area of air bleed to maintain air fuel ratio in the carburetor 200 at the target air fuel ratio.

Air fuel ratio control in carbureter

Bonder for end section of raw sheet of small wooden box

PURPOSE:To improve an operating performance at an accelerating time, by a method wherein, in a control method for increasing the fuel during acceleration, a fuel jet is conducted a given number of times during no deceleration is detected at a specified cycle being independent of the running of an engine. CONSTITUTION:A step 5 determines that the number of revolutions of an engine is high, and a step 6 determines that a water temperature TW of an engine exceeds a given temperature. In case such conditions are satisfied, a response at an accelerating time is excellent, and thereby a non-synchronous jet is not needed. A step 9 determines whether or not a difference between the degree thetaAn of opening of a throttle valve read by a step 4 and a preceding value thetaAn-1 is a given value GA , and if YES, a jetting is made each time a pulse of a non- synchronous signal is inputted. After a jetting takes place a given number NACCA of times, a jet is suspended by steps 15 and 11. When a decelerating state is detected, a non-synchronous jet is suspended if the jetting is not committed the given number of times. This permits the improvement of an operating performance at an accelerating time.

Control method for supply of fuel at accelerating time of internal-combustion engine

PURPOSE: To prevent excessive fuel from being fed and control air-fuel ratio in the cylinders by varying the number of times if injection in accordance with the driving conditions of a engine and changing the injection pulse length corresponding to the number of times of injection. CONSTITUTION: The injection control circuit 12 changes the number of pulses per pulse length of the fuel injection pulse signal and a unit engine rotation corresponding to the output voltage from the pressure sensor 11. The multiplication circuit 13 generates the pulse signal by multiplying the pulse length of the fuel injection pulse signal sent out from the injection control circuit 12 by the compensation signal from the compensation circuit 14 to correct fuel feeding rate in accordance with the driving conditions of the engine 1. The injection pulse signals can be obtained by passing both output signals from the injection control circuit 12 and the multiplying circuit 13 through the OR circuit 15, and said signal is amplified and applied to the electromagnetic coil of the electromagetic type fuel injection valve 9. COPYRIGHT: (C)1980,JPO&Japio

Electronic controlled fuel injection device

PURPOSE:To enable to start feedback control promptly when feedback control is interrupted, by providing a circuit for detecting the extent of engine warming, and controlling a feedback interrupting circuit for interrupting feedback control of air- fuel ratio and other circuits depending on the output of the said engine-warming detecting circuit. CONSTITUTION:An air-fuel ratio controlling system of this invention comprises an injection controlling circuit 2 and an air-fuel ratio feedback circuit 5 which includes an air-fuel ratio judging circuit 51 for judging the level of air-fuel ratio through comparison of output of air-fuel ratio sensor 4 with a reference value and an integration circuit 52 for compensating the width of injection pulse by integrating the output of said circuit 51 and furnishing the result to multiplication circuit 23 in circuit 2. The air-fuel ratio controlling system further comprises an engine warming circuit 7 including circuit 72 for detecting the extent of engine warming, a feedback interrupting circuit 53 for interrupting feedback control of air-fuel ratio depending on the output of said circuit 7 and output signal representing operational condition of engine, and a changeover instructing circuit 54 operated to increase the basic air- fuel ratio only when instruction for interrupting feedback control is given after engine is warmed up and to switch the basic air-fuel ratio to a predetermined air- fuel ratio under other states.

Takashi Wakabayashi

Papers

Electronic controlled fuel injection device

Airrfuel ratio controlling system