Interrelated power delivery controls – including engine control – Brake control – Sensed condition responsive control of engine of brake
Reexamination Certificate
2011-06-14
2011-06-14
Pang, Roger (Department: 3655)
Interrelated power delivery controls, including engine control
Brake control
Sensed condition responsive control of engine of brake
C477S203000, C180S165000, C180S053400
Reexamination Certificate
active
07959538
ABSTRACT:
An engine of a working vehicle in which an adverse effect of oil temperature rise is avoided, by decreasing a load applied to an accelerator when the working vehicle moves while lifting a boom and approaches a place where the load in a bucket is to be dumped during dump approach and, reducing heat generated through operation of a brake, and deterioration in work efficiency of the working vehicle is avoided by preventing the lifting speed of a boom from decreasing. A hydraulic pump controller and a method for controlling the hydraulic pump are also provided. On conditions that a throttle amount sensor detects that an operation amount of an accelerator pedal is a prescribed threshold value (operation amount 70%) or higher, a brake pressure sensor detects that a brake unit is actuated (brake on), and a vehicle speed sensor detects that a body speed is a prescribed threshold value or higher, a transmission controller outputs a throttle correction order to decrease a target engine speed to a governor through an engine controller, and outputs to a pump control valve through a work equipment controller an order to change a swash plate angle at the time of lifting the boom to cover a decrease amount of a discharge flow rate of a hydraulic pump by the throttle correction order to maintain the discharge flow rate from the hydraulic pump.
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International Search Report issued Dec. 19, 2006 in the International (PCT) Application of which the present application is the U.S. National Stage.
Komatsu Ltd.
Pang Roger
Wenderoth , Lind & Ponack, L.L.P.
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