Hitachi Construction Machinery Co., Ltd.

Tomoo Takahashi

Koji Hyodo

Tetsuji Tanaka

Masaki Yoshikawa

Atsushi Shimazu

Kentaro Itoga

Hiroki Nakazono

Eiichi Sakai

Kazuo Chonan

Genichiro Ishimaru

There are provided: a pedal operation amount detection unitthat detects an operation amount s of the accelerator pedal; a speed ratio detection unitthat detects a speed ratio e of an input shaft and an output shaft of the torque converter; a load pressure detection unitthat detects a load pressure P of the hydraulic pump; a speed stage detection unitthat detects a low speed stage of a transmissioncapable of varying a speed stage between a low speed stage and a high speed stage; and a speed limiting unitthat limits a maximum speed of the engineto a lower speed upon satisfaction of following speed limitation conditions: at least a pedal operation amount s is equal to or greater than a predetermined value s, a speed ratio e is equal to or less than a predetermined value ea, a load pressure P is equal to or greater than a predetermined value Pa, and the low speed stage of the transmission has been detected.

Engine control device for working vehicle

A gearshift controller for an industrial vehicle, includes: a speed ratio detection unit that detects a speed ratio of speeds of an input axis and of an output axis of a torque converter; a gearshift control unit that shifts up a speed stage when the detected speed ratio is equal to or more than a first predetermined value and shifts down the speed stage when the detected speed ratio is equal to or less than a second predetermined value, which is smaller than the first predetermined value; and an operation member with which a downshift to the first speed is instructed by operation thereof by an operator. When the downshift is instructed by the operation member, the gearshift control unit controls the speed stage to be kept at the first speed for a predetermined time period regardless of the speed ratio detected by the speed ratio detection unit.

Gearshift controller for industrial vehicle

Growing community of inventors

Kasumigaura, Japan

Tomoo Takahashi