US 2004/0000281 A1 · Engine starting device

Abstract

Engine starting performance is enhanced by a brushless motor having no rotor position detecting sensor. In the first place an engine is rotated forward and then is reversely rotated to overcome a high load region of the engine. Then, the engine is accelerated and rotated forward and started. In a light load region of the engine, the engine is immediately accelerated and normally rotated. It is judged whether the region of the engine is the high load region or light load region based on the rotation speed when the starting operation is started. After the starting operation is started, if the forward rotation speed reaches a first speed, and a second speed which is higher than the first speed is obtained even after predetermined time is elapsed, an immediate starting-judging section 36 outputs a detection signal to a starting/normal rotation control section 37.

Claims4

Dependent claims

An engine starting device for internal combustion engine comprising:

a motor capable of reversely rotating for starting an engine;
a rotation speed detecting means for detecting rotation speed of the motor;
and
a drive-control means for driving the motor in accordance with a starting-target revolution number when the following two conditions in which initial excitation current is allowed to flow through the motor to forward rotate the engine are satisfied:
a first condition in which the rotation speed reaches a first speed within first period of time from when the motor is started to rotate, and a second condition in which a second speed higher than the first speed is obtained after second period of time longer than the first period of time is elapsed.

2 more elements

Dependencies are inferred from the claim text.

Engine starting device

Life of this patent

Engine starting device

Life of this patent

Abstract

Claims4