EP0353799A1
Expired / Lapsed
EP
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Apparatus for controlling rotational speed of prime mover of construction machine
Assignee: Hitachi Construction Machinery Co Ltd
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Filing: 1989-07-03
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Granted: —
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Expires: 2009-07-03
Abstract
Abstract A controller having an up/down (6U, 6D) switch for changing the rotational speed of a prime mover such as an engine (1), an actuator (3) 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.
Inventors
- 👤 Akira Tatsumi
- 👤 Toichi Hirata
- 👤 Masaki Egashira
- 👤 Osamu Tomikawa
- 👤 Hiroshi Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 22:23
CPC Classifications
F; F02; F02D; F02D45/00; F02D29/00; F02D29/04; E; E02; E02F; E02F9/00; E02F9/20; E02F9/2025; E02F9/22; E02F9/2246; E02F9/2278; E02F9/2296
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
121 words
An apparatus for controlling the rotational speed of a prime mover of a construction machine, comprising: prime mover controller means for controlling the rotational speed of the prime mover; drive means for driving said prime mover controller means; up/down command operation means operated between an up position at which it outputs an up signal for increasing the rotational speed of the prime mover and a down position at which it outputs a down signal for reducing the rotational speed of the prime mover; and signal transmission means for supplying a drive signal to said drive means whereby the prime mover rotational speed is increased on the basis of said up signal and is reduced on the basis of said down signal.
Claim 2
Independent Claim
61 words
An apparatus according to claim l, further comprising: set speed command means for issuing a command to shift the prime mover rotational speed to at least one set speed previously determined; and shift means for shifting the prime mover rotational speed to said set speed on the basis of a set speed command signal output from said set speed command means.
Claim 3
Dependent Claim
56 words
An apparatus according to claim 1, wherein said signal transmission means comprises control means for calculating a target prime mover speed on the basis of the up signal and the down signal, said control means supplying said drive signal to said drive means so that the prime mover rotational speed is adjusted to said target speed.
Claim 4
Dependent Claim
68 words
An apparatus according to claim 3, further comprising set speed command means for issuing a command to shift the prime mover rotational speed to at least one set speed previously determined, wherein said target prime mover speed is calculated on the basis of a set speed command signal output from said set speed comnand means whereby the prime mover rotational speed is adjusted to said one set speed.
Claim 5
Independent Claim
196 words
An apparatus for controlling the rotational speed of a prime mover of a construction machine, having a hydraulic pump driven by the prime mover, an actuator driven by oil discharged from said hydraulic pump and operating means for controlling the operation of said actuator, said apparatus comprising: prime mover controller means for controlling the rotational speed of the prime mover; drive means for driving said prime mover controller means; up/down command operation means operated between an up position at which it outputs an up signal for increasing the rotational speed of the prime mover and a down position at which it outputs a down signal for reducing the rotational speed of the prime mover; detection means for detecting an operational value which represents the operation of said operation means; and control means for calculating a first target prime mover speed on the basis of the up signal and the down signal, and a second target speed on the basis of the operational value detected by said detection means, said control means supplying a drive signal to said drive means whereby the prime mover speed is adjusted to higher one of said first and second target speeds.
Claim 6
Dependent Claim
60 words
An apparatus according to claim 3, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover rotational speed effected by said prime mover controller means, wherein said control means outputs the drive signal when the difference between the detected control speed and the target speed is larger than a predetermined value.
Claim 7
Dependent Claim
60 words
An apparatus according to claim 4, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover rotational speed effected by said prime mover controller means, wherein said control means outputs the drive signal when the difference between the detected control speed and the target speed is larger than a predetermined value.
Claim 8
Dependent Claim
60 words
An apparatus according to claim 5, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover rotational speed effected by said prime mover controller means, wherein said control means outputs the drive signal when the difference between the detected control speed and the target speed is larger than a predetermined value.
Claim 9
Dependent Claim
32 words
An apparatus according to claim 3, wherein the drive signal is output when the difference between present and past target speeds calculated by said control means is larger than a predetermined value.
Claim 10
Dependent Claim
32 words
An apparatus according to claim 4, wherein the drive signal is output when the difference between present and past target speeds calculated by said control means is larger than a predetermined value.
Claim 11
Dependent Claim
32 words
An apparatus according to claim 5, wherein the drive signal is output when the difference between present and past target speeds calculated by said control means is larger than a predetermined value.
Claim 12
Dependent Claim
28 words
An apparatus according to claim 3, wherein said control means set the target speed to a predetermined start rotation speed in response to starting of the prime mover.
Claim 13
Dependent Claim
28 words
An apparatus according to claim 4, wherein said control means set the target speed to a predetermined start rotation speed in response to starting of the prime mover.
Claim 14
Dependent Claim
28 words
An apparatus according to claim 5, wherein said control means set the target speed to a predetermined start rotation speed in response to starting of the prime mover.
Claim 15
Dependent Claim
39 words
An apparatus according to claim 3, wherein said control means controls said drive means in response to stoppage of said prime mover so as to set said drive means to a position corresponding to a predetermined start rotation speed.
Claim 16
Dependent Claim
39 words
An apparatus according to claim 4, wherein said control means controls said drive means in response to stoppage of said prime mover so as to set said drive means to a position corresponding to a predetermined start rotation speed.
Claim 17
Dependent Claim
39 words
An apparatus according to claim 5, wherein said control means controls said drive means in response to stoppage of said prime mover so as to set said drive means to a position corresponding to a predetermined start rotation speed.
Claim 18
Dependent Claim
36 words
An apparatus according to claim 3, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the present target speed.
Claim 19
Dependent Claim
36 words
An apparatus according to claim 4, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the present target speed.
Claim 20
Dependent Claim
36 words
An apparatus according to claim 5, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the present target speed.
Claim 21
Dependent Claim
63 words
An apparatus according to claim 3, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover speed effected by said prime mover controller means, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the present target speed.
Claim 22
Dependent Claim
63 words
An apparatus according to claim 4, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover speed effected by said prime mover controller means, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the present target speed.
Claim 23
Dependent Claim
63 words
An apparatus according to claim 5, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover speed effected by said prime mover controller means, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the present target speed.
Claim 24
Dependent Claim
45 words
An apparatus according to claim 3, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the period of time for which said up/down command operation means is operated.
Claim 25
Dependent Claim
45 words
An apparatus according to claim 4, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the period of time for which said up/down command operation means is operated.
Claim 26
Dependent Claim
45 words
An apparatus according to claim 5, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the period of time for which said up/down command operation means is operated.
Claim 27
Dependent Claim
69 words
An apparatus according to claim 3, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover speed effected by said prime mover controller means, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the difference between the target speed and the control speed.
Claim 28
Dependent Claim
69 words
An apparatus according to claim 4, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover speed effected by said prime mover controller means, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the difference between the target speed and the control speed.
Claim 29
Dependent Claim
69 words
An apparatus according to claim 5, further comprising prime mover speed control value detecting means for detecting a value for control of the prime mover speed effected by said prime mover controller means, wherein when the target speed is within a predetermined rotational speed range, the driving speed of said drive means is increased to the extent depending on the difference between the target speed and the control speed.
Claim 30
Dependent Claim
51 words
An apparatus according to of claim 1, said construction machine comprises a hydraulic pump driven by the prime mover, a plurality of actuators driven by oil discharged from said hydraulic pump and a plurality of operating levers provided in association with said actuators to control the operations of the said actuators.
Claim 31
Dependent Claim
51 words
An apparatus according to of claim 2, said construction machine comprises a hydraulic pump driven by the prime mover, a plurality of actuators driven by oil discharged from said hydraulic pump and a plurality of operating levers provided in association with said actuators to control the operations of the said actuators.
Claim 32
Dependent Claim
51 words
An apparatus according to of claim 3, said construction machine comprises a hydraulic pump driven by the prime mover, a plurality of actuators driven by oil discharged from said hydraulic pump and a plurality of operating levers provided in association with said actuators to control the operations of the said actuators.
Claim 33
Dependent Claim
51 words
An apparatus according to of claim 4, said construction machine comprises a hydraulic pump driven by the prime mover, a plurality of actuators driven by oil discharged from said hydraulic pump and a plurality of operating levers provided in association with said actuators to control the operations of the said actuators.
References Cited (Backward Citations)
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