Kabushiki Kaisha Komatsu Seisakusho

Satoru Nishita

Shigeru Yamamoto

Kazushi Nakata

Shigenori Matsushita

Shu H Zhang

An engine overrun preventing system for a vehicle, in which the overrun of an engine is prevented when the overrun of the engine is detected, by (i) switching a lock-up system provided in a torque convertor OFF to cause a slip, if it is detected that the lock-up system is in its ON state; (ii) shifting a transmission into a speed range which is one grade lower than a presently selected speed range and reducing vehicle speed by engine brake, if it is detected that the lock-up system is in its OFF state and that the transmission is placed in another speed range than a first speed; and (iii) actuating a brake to reduce vehicle speed, if it is detected that the lock-up system is in its OFF state and that the transmission is placed in the first speed and if a detected vehicle speed is equal to a predetermined vehicle speed or more.

Engine overrun preventing system for a vehicle

A load control unit for a bulldozer, comprising an actual tractive force detector for detecting the actual tractive force of a vehicle body; target tractive force setting switch for setting a target tractive force for an automatic blade control mode in dozing operation; and blade controller for controlling a blade to be lifted or lowered such that if there is a difference between the actual tractive force detected by the actual tractive force detector and the target tractive force set by the target tractive force setting switch when digging is started with the automatic blade control mode in dozing operation, the actual tractive force gradually comes closer to the target tractive force.

Load control unit for a bulldozer

A blade control system for use in a bulldozer comprising: a driving mode setting device which can set an automatic blade control mode during dozing operation; a running condition detector for detecting whether a transmission is placed in forward range or reverse range; and a blade controller for controlling tilting and lowering of a blade such that when the speed range detector has detected that the transmission is placed in forward range and the driving mode setting device has set the automatic blade control mode to start digging, the lower end of the blade becomes horizontal in relation to a vehicle body and is brought into contact with the ground.

Blade control system for use in a bulldozer

A control unit for controlling load on a bulldozer in the case of manual intervention, comprising: an actual tractive force detector for detecting the actual tractive force of a vehicle body; a target tractive force setting device for setting a target tractive force for an automatic blade control mode in dozing operation according to the actual tractive force detected by the actual tractive force detector; and a blade controller for controlling a blade to be lifted or lowered such that, if there is a difference between the target tractive force set by the target tractive force setting device when switching from the automatic blade control mode to a manual operation mode takes place in dozing operation and the actual tractive force detected by the actual tractive force detector when return from the manual operation mode to the automatic blade control mode takes place, the actual tractive force gradually comes closer to the target tractive force set when switching to the manual operation mode takes place.

Control unit for controlling load on a bulldozer in the case of manual

A straight-ahead traveling control system for a bulldozer comprising: (a) a driving mode setting device which can set an automatic blade control mode for dozing operation; (b) a yaw angle detector for detecting the yaw angle of a vehicle body in relation to a target traveling direction for the vehicle body; (c) a blade tilt angle detector for detecting the tilt angle of the blade tilting laterally in relation to the ground; and (d) a blade controller for controlling tilting of the blade based on a first blade tilting amount used for driving the vehicle body straight ahead and a second blade tilting amount used for forming a laterally horizontal earth surface after digging by the blade, the first blade tilting amount being obtained from the yaw angle of the vehicle body detected by the yaw angle detector and the second blade tilting amount being obtained from the tilt angle of the blade detected by the blade tilt angle detector, when the driving mode setting device has set the automatic blade control mode.

Straight-ahead traveling control system for a bulldozer

A dozing system for a bulldozer, comprising an actual tractive force detector for detecting an actual tractive force of a vehicle body; a target tractive force setting device for setting a target tractive force for a vehicle body; a tractive force deviation calculator for calculating the deviation between the actual tractive force detected by the actual tractive force detector and the target tractive force set by the target tractive force setting device; and a comparison control unit for controlling a blade to be lifted or lowered such that the absolute value of the deviation is increased, when at least the absolute value of the deviation is less than a preset value and tile actual tractive force is approaching the target tractive force.

Dozing system for a bulldozer

An automatic drive control system for a bulldozer comprising a digging start detector for detecting that the bulldozer is in a digging start position, a digging end detector for detecting that the bulldozer is in a digging end position, a driving direction detector for detecting the momentarily varying driving direction of the bulldozer, and a drive controller for shifting a transmission into a forward gear when the digging start detector detects that the bulldozer is presently in the digging start position; shifting the transmission into a reverse gear when the digging end detector detects that the bulldozer is presently in the digging end position; and controlling the bulldozer such that the driving direction detected by the driving direction detector is made coincident with a target driving direction when the bulldozer is moving from the digging start position towards the digging end position.

Growing community of inventors

Hirakata, Japan

Satoru Nishita