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Claims for Patent: 4,955,344

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Claims 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): Tatsumi; Akira (Chiba, JP), Hirata; Toichi (Ibaragi, JP), Egashira; Masaki (Ibaragi, JP), Tomikawa; Osamu (Ibaragi, JP), Watanabe; Hiroshi (Ibaragi, JP)
Assignee: Hitachi Construction Machinery Co., Ltd. (Tokyo, JP)
Application Number:07/374,836
Patent Claims: 1. 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.

2. An apparatus according to claim 1, 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.

3. 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.

4. 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 command means whereby the prime mover rotational speed is adjusted to said one set speed.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

12. 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.

13. 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.

14. 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.

15. 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.

16. 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.

17. 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.

18. 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.

19. 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.

20. 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.

21. 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.

22. 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.

23. 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.

24. 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.

25. 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.

26. 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.

27. 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.

28. 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.

29. 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.

30. 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.

31. 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.

32. 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.

33. 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.
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