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公开(公告)号：JPH02176163A
公开(公告)日：1990-07-09
申请号：JP27961289
申请日：1989-10-26
Applicant: MARELLI AUTRONICA
Inventor： ROBERUTO PAGAANO
Abstract: PURPOSE: To guarantee optimal preheating by providing a differentiating means generating signals indicative of the time differential of the intensity of current flowing in plugs and a comparator circuit means for shutting off the current flowing in the plugs by a switch means when the signal generated by the differentiating means indicates a predetermined threshold value. CONSTITUTION: A user operates a switch so that electric current flows to an excitation coil 6a of a relay 6, a switch 6b is open and resistance value of resistance elements of preheating plugs 2 is increased. Consequently, the current intensity consumed by them is reduced gradually. When a comparator 10 detects that the current flowing in the plugs 2 falls below a predetermined value on the basis of the signal fed to a sensor 7, the output signal of the comparator 10 is shifted to L and a lamp 5 is turned off. When a comparator 11 decides that the differentiation value of the current passing through the plugs 2 is below a predetermined value, the output of the comparator 11 turns to the L level and the relay 6 is in non-operation. The switch 6b is turned on to shut off the current to plugs 2.
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公开(公告)号：JPH02176139A
公开(公告)日：1990-07-09
申请号：JP27961389
申请日：1989-10-26
Applicant: MARELLI AUTRONICA
Inventor： ROBERUTO PAGAANO
Abstract: PURPOSE: To reduce energy consumption by providing a storage inductor permanently connected to a first pole of a voltage supply and a conductive bypass path between the first pole and a load. CONSTITUTION: A switch SW1 interposed between a storage inductor Li and a first pole 1 of a power supply VB is controlled by an electronic control unit ECU. The switch SW1 initially turned on to direct electric current from the power supply to the storage inductor Li is turned to a non-excited state for quickly transmitting the current from the storage inductor to a load Li. A unit ECU causes switches SW3 and SWi to open and close in counterphase in order to maintain the current in the load Li at a predetermined average level. The control is effected both when the current in the load Li is maintained at a preset maximum value in a predetermined period of time and when the current is maintained at a lower 'maintained' current value. Thus, it is possible to reduce the number of electronic switches controlling the load Li.
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