Electromagnetic relay
AssigneeDenso Corporation
InventorsYoshiaki SUZUKI, Mitsuhiro MURATA
Life of this patent
Estimating the term…
Abstract
An electromagnetic relay for starting a motor of a starter includes a resistor to reduce an activation current that flows through the motor from a battery for activation of the motor, a relay contact that causes the starting current to flow while bypassing the resistor, a relay coil that forms an electromagnet when excited by energization, and a control circuit that controls an excited state of the relay coil for activation of the motor to open or close the relay contact, thus controlling energization of the motor from the battery via the resistor. The electromagnetic relay incorporates therein the control circuit.
Claims7
An engine starting system comprising:
- a motor;
- an electromagnetic switch comprising an excitation coil and a plunger that moves by the excitation coil, and configured to open or close a main contact provided in a motor circuit for current supply to the motor from a battery;
- an electromagnetic relay comprising:
- a resistor connected to the motor circuit;
- a relay contact connected to the motor circuit while bypassing the resistor;
- and a relay coil, the electromagnetic relay having a normally closed contact structure in which the relay contact is closed with the relay coil de-energized;
- a control circuit that controls open and close of the relay contact;
- and
- a starting switch,
- wherein:
- the electromagnetic switch is energized based on turn-on of the starting switch, so that the relay contact is opened by the control circuit, the energized electromagnetic switch causing the plunger to be attracted, movement of the plunger closing the main contact, the closed main contact causing current to flow from the battery to the motor via the resistor;
- and
- the control circuit de-energizes the relay coil to close the relay contact after the current flows to the motor via the resistor to thereby form an electric conduction path that short-circuits both ends of the resistor, thus energizing the motor via the electric conduction path based on a full-voltage of the battery.
Dependencies are inferred from the claim text.