Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Patent
1997-06-26
2000-04-18
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
123319, 123342, 123349, 123351, 123361, 180170, 180179, 701 97, F02D 2900, F02D 4104, B60K 4128
Patent
active
060526440
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus and a method for limiting the vehicle speed of a working vehicle, particularly that of a dump truck.
BACKGROUND ART
Hitherto, in a working vehicle such as a dump truck, the influence of the load on each part of a vehicle, such as the body, the tires, the wheel mounting portions, and the suspension is increased by the weight of earth, sand, stones, and rocks which are loaded on the vehicle at the time of traveling. Particularly, when the load weight is heavier than the set maximum allowable load weight, i.e., when so-called overloaded, the influence of the overload on each part of the vehicle is remarkably increased in a state where a transmission is shifted to a maximum speed stage and the vehicle runs at the maximum engine speed, i.e., a state where the vehicle runs at its allowable maximum speed. For this reason, not only the durability of each part of the vehicle, the tire life, and the ride quality are deteriorated while traveling, but also a road surface is likely to be damaged, so it is necessary to repair the road surface frequently.
In order to solve the above problem, an apparatus for limiting the vehicle speed is proposed so that the vehicle speed does not increase to an allowable maximum speed corresponding to the load weight or higher during traveling under the control of an accelerator pedal (hereinafter, referred to as accelerated traveling). As such an apparatus, a vehicle speed limiting apparatus is proposed in Japanese Unexamined Patent Publication No. 5-221251, for example, in which the shifting of a transmission to a higher speed stage is prohibited in order to limit the maximum traveling speed of a dump truck.
A conventional vehicle speed limiting apparatus will be described with reference to FIGS. 20 to 23. Referring to FIG. 20, the steering front wheels 82 are mounted to the left and right of the front portion of a vehicle body 81 through a suspension cylinder 83, and the driving rear wheels 84 are mounted to the left and right of the back portion of the vehicle body 81 through a suspension cylinder 85. A driver's cab 86 is mounted on the front portion of the vehicle body 81, and a cargo container 87 is vertically pivotably mounted on the back of the vehicle body 81 via a hoist cylinder 88. Each of the suspension cylinders 83 and 85 is provided with a pressure sensor 89 for detecting the pressure in the respective cylinder extension chamber.
Referring to FIG. 21, an output shaft of an engine 45 is connected to an input shaft of a transmission 91, such as a torque flow transmission, and an output shaft of the transmission 91 is connected to the driving rear wheels 84. A speed change control valve 94, for changing each speed change stage, is attached to the transmission 91, and each speed change stage of the transmission 91 is switched by actuating the speed change control valve 94 with a shift signal from a speed change controller 93. A load weight calculator 99 receives pressure signals from the pressure sensors 89 of the suspension cylinders 83 and 85, calculates the load weight from the pressure signals, and outputs a calculated load weight signal to the speed change controller 93. A speed stage signal, from a shift lever 95 located in the driver's cab 86, is inputted to the speed change controller 93.
FIG. 22 shows a case where the speed of the engine 45, having a mechanical governor device, is mechanically controlled by an accelerator pedal 1. That is, when the accelerator pedal 1 is depressed to a position at an angle .theta.op, a member 143 rotates about a first central axis 142 by an angle proportional to the angle .theta.op, whereby the member 143 rotates an accelerator lever 144 of the engine 45 to form an angle corresponding to the angle .theta.op. The accelerator lever 144 actuates a fuel injection pump (not shown) through a mechanical governor device (not shown) integrated into the engine 45, and controls the fuel injection amount and the fuel injection timing so as to obtain an engine speed corresponding to
REFERENCES:
patent: 5327865 (1994-07-01), Riehemann
Hasegawa Nobuki
Murakami Takanobu
Sato Susumu
Cuchlinski Jr. William A.
Komatsu Ltd.
Pipala Edward
LandOfFree
Apparatus and method for limiting vehicle speed of a working veh does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for limiting vehicle speed of a working veh, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for limiting vehicle speed of a working veh will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2344642