US 5,686,819 A · Control apparatus for AC generator of motor vehicle

Abstract

A control apparatus for an AC generator of a motor vehicle of high reliability having substantially no adverse influence to an onboard battery and an onboard high-voltage load by suppressing to a passible minimum variation of a regulating voltage which may occur as contacts of a detection voltage change-over switch are degraded. An AC generator of a motor vehicle includes a rectifier circuit for rectifying an output of the AC generator including a field coil, an output change-over switch for changing over an output of the rectifier circuit to either one of a battery and a high-voltage electric load mounted on the motor vehicle, and a voltage regulator for regulating an exciting current supplied to the field coil in dependence on a terminal voltage of the battery as detected on a charging line connected to the battery by way of the output change-over switch upon charging of the battery from the output of the rectifier circuit, to thereby regulate the output voltage of the AC generator.

Claims8

Dependent claims

A control apparatus for an AC generator of a motor vehicle, comprising:

a rectifier circuit for rectifying an output of said AC generator including a field coil;
output change-over means for changing over said output of said rectifier circuit to one of a battery and a high-voltage load mounted on said motor vehicle;
voltage regulating means for regulating an exciting current supplied to said field coil in dependence on a terminal voltage of said battery as detected on a charging line connected to said battery by way of said output change-over means upon charging of said battery from the output of said rectifier circuit, to thereby regulate the output voltage of said AC generator;
and
means for preventing damage to contacts of the change-over means when switching from the battery to the high-voltage load, said damage prevention means comprising:
high-voltage control means including time delay means for interrupting the exciting current flowing through the field coil for a brief, predetermined time interval during change-over to said high-voltage load.

3 more elements

A control apparatus for an AC generator of a motor vehicle, comprising:

a rectifier circuit for rectifying an output of said AC generator including a field coil;
output change-over means for changing over said output of said rectifier circuit to one of a battery and a high-voltage load mounted on said motor vehicle;
voltage regulating means for regulating an exciting current supplied to said field coil in dependence on a terminal voltage of said battery as detected on a charging line connected to said battery by way of said output change-over means upon charging of said battery from the output of said rectifier circuit, to thereby regulate the output voltage of said AC generator;
and
high-voltage control means for detecting a terminal voltage of a said high-voltage load upon switching of said output change-over means to said high-voltage load to thereby output a drive signal for controlling operation of said voltage regulating means upon detecting one of said terminal voltage of said high-voltage load below a first reference voltage and said terminal voltage of said high-voltage load above a second reference voltage, wherein said detection constitutes an abnormality detection.

2 more elements

Dependencies are inferred from the claim text.

Control apparatus for AC generator of motor vehicle

Life of this patent

Control apparatus for AC generator of motor vehicle

Life of this patent

Abstract

Claims8