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Last Updated: December 31, 2025

Claims for Patent: 4,955,344

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Summary for Patent: 4,955,344

Title:	Apparatus for controlling rotational speed of prime mover of construction machine
Abstract:	A controller having an up/down switch for changing the rotational speed of a prime mover such as an engine, an actuator such as an electric motor for driving a governor on the basis of the operation of the up/down switch so as to control the rotational speed of the prime mover. A target speed is calculated on the basis of the operation of the up/down switch, and the prime mover speed is controlled by using the calculated value. Another switch is provided to immediately shift the prime mover speed to a speed previously set as desired. This shift switch is used to control the prime mover so that the prime mover rotates at the set speed, and this speed is adjusted by operating the up/down switch.
Inventor(s):	Akira Tatsumi, Toichi Hirata, Masaki Egashira, Osamu Tomikawa, Hiroshi Watanabe
Assignee:	Hitachi Construction Machinery Co Ltd
Application Number:	US07/374,836
Patent Claims:

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