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System and method for controlling vehicle speed

A vehicle speed, vehicle speed technology, applied in the direction of control/regulation systems, control devices, vehicle components, etc., can solve problems such as the inability to maintain vehicle speed

Inactive Publication Date: 2008-10-15
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the system described in the '261 patent controls the engine speed of the vehicle and the forward gears of the powershift transmission, the system of the '261 patent suffers from the aforementioned drawbacks, such as inability to maintain the speed of the vehicle when the engine is subjected to varying loads

Method used

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  • System and method for controlling vehicle speed
  • System and method for controlling vehicle speed
  • System and method for controlling vehicle speed

Examples

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Embodiment Construction

[0023] FIG. 1 schematically illustrates an exemplary vehicle 10 including a powerplant 12 and a transmission 14 operably connected to the powerplant 12 , such as via a torque converter 16 . The output of transmission 14 can be operatively connected to one or more drive components 18 configured to power one or more ground-engaging tracks 20 to propel vehicle 10 over terrain 22 .

[0024] The power plant 12 may be an internal combustion engine, such as a spark ignition engine or a compression ignition engine such as a diesel engine. It is also conceivable to use other power means known to those skilled in the art. The transmission 14 may be a powershift transmission and may include gearing and one or more clutch packs configured to provide a plurality of forward and / or Or reverse the gear ratio. For example, transmission 14 may include one or more planetary gear trains and one or more clutches configured to be selectively engaged to provide transmission 14 with multiple forwar...

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PUM

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Abstract

A system (24) is provided for controlling the speed of a vehicle (10) having a power plant (12) and a transmission (14). A control unit (26) is configured to receive a signal indicative of the speed of the vehicle. The control unit is further configured to determine a desired output speed of the power plant based on the signal indicative of the speed of the vehicle, a signal indicative of the gear ratio of the transmission, and a desired vehicle speed associated with the gear ratio. The control unit is also configured to send a signal to the power plant, such that power plant operates at an output speed that substantially maintains the desired vehicle speed in a manner substantially independent of a magnitude of load on the power plant.

Description

technical field [0001] The present invention relates generally to systems and methods for controlling vehicle speed, and more particularly to systems and methods for controlling vehicle speed by controlling the vehicle's powerplant and / or transmission (transmission). Background technique [0002] A vehicle may include a power plant for providing power to operate the vehicle and a transmission for converting at least a portion of the power into work to propel the vehicle. The speed of the vehicle may be controlled by controlling the output of the vehicle's powerplants and / or by selecting the gear ratios (speed ratios) of the vehicle transmission. For example, a vehicle may include an internal combustion engine configured to operate within a range of engine speeds and a transmission configured to convert the engine speed to an output speed such that the vehicle operates at a speed that varies according to a combination of the engine speed and the ratio of the engine speed to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K31/04
Inventor I・斯特拉施尼A・O・丰卡尔斯鲁德
Owner CATERPILLAR INC