Running control device on cargo handling vehicles
AssigneesKabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kabushiki Kaisha Toyota Chuo Kenkyusho
InventorsToshihide Narita, Masatoshi Yamada, Eiichi Yasuda
Life of this patent
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Abstract
A control device for use in a cargo handling vehicle in which a single power plant provides both the vehicle drive and the power to the cargo handling device has a continuously variable transmission. The cargo handling device is actuated by means of a hydraulic pump. Whether or not the cargo handling device is in operation the operator need not adjust the degree of depression of a drive pedal to maintain constant vehicle speed because automatic compensation means are provided for that purpose. The demands upon the vehicle operator are accordingly reduced.
Claims53
A control device for a cargo handling vehicle equipped with a cargo handling device in which a cargo handling hydraulic pump of said cargo handling device is driven by a power plant and the vehicle is driven by the same power plant via a continuously variable transmission, comprising
- (a) vehicle drive means,
- (b) a first operation means for computing the relation of variation between a value in response to speed of said power plant based on the operation of the cargo handling device and a value corresponding to the speed of said power plant when the cargo handling device is not in operation,
- (c) a second operation means for computing, on the basis of said relation of variation in the values in response to the speed of said power plant, a speed ratio of said continuously variable transmission to compensate for fluctuation in vehicle speed during operation of said cargo handling device, and
- (d) a control means for controlling the speed ratio of said continuously variable transmission on the basis of the computed speed ratio,
- all of said means being in operation while the vehicle is running.
Dependencies are inferred from the claim text.