Title:
MOTOR ROTATION FREQUENCY CONTROL DEVICE OF HYDRAULIC DRIVEN VEHICLE
Document Type and Number:
Japanese Patent JP2744707
Kind Code:
B2
Abstract:
PURPOSE: To improve the workability by controlling to convert the motor rotation frequency depending on the pedal depressing amount in an operation, reducing the motor rotation frequency by the passage of time in a running deceleration, and converting the rotation frequency depending on the pedal depressing amount in a running acceleration.
CONSTITUTION: When a running pedal 6a is operated to the acceleration side in a running, a controller 33 detects the running condition of a vehicle, and increases the rotation frequency of an engine 21. And when the pedal 6a is operated to the deceleration side, the controller 33 reduces the rotation frequency of the engine 21 proportionally with the passage of time. When a brake switch 36 is converted to the W position at the starting of the work, and a main brake device 108 and a parking brake 106 are operated, the controller 33 detects the working condition of the vehicle. Furthermore, the controller 33 elects a rotation frequency of the engine 21 according to the operating amount of the pedal 6a, and increases or decreases the rotation frequency corresponding to the operating amount, regardless of whether it is in acceleration or deceleration.
Inventors:
Kazuhiro Ichimura
Seiji Tamura
Akira Tatsumi
Seiji Tamura
Akira Tatsumi
Application Number:
JP3545191A
Publication Date:
April 28, 1998
Filing Date:
February 05, 1991
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F9/22; (IPC1-7): E02F9/22
Domestic Patent References:
| JP2190536A | ||||
| JP2279836A | ||||
| JP3135844A |
Attorney, Agent or Firm:
Fuyuki Nagai