Patent ID: 7771314
Filing Date: 2010-08-10
Classification: B60T,B60W,B60Y,F02D,F16D,F16H,G05G,Y10T

Abstract:
1. A control apparatus for a work vehicle provided with a hydraulic stepless transmission for transmitting power from an engine mounted on a traveling body equipped with travel wheels, a speed change pedal for changing a speed change ratio of the hydraulic stepless transmission, a forward drive clutch and a reverse drive clutch that transmit a transmission drive output from the hydraulic stepless transmission to the travel wheels, and a brake for braking the travel wheels, the control apparatus comprising: a transmission sensor that detects a step-on amount of the speed change pedal; a transmission output unit rotation sensor that detects a revolution speed of an output shaft; and a controller; wherein the control apparatus conducts control so that any one of the forward drive clutch and reverse drive clutch is engaged in response to a step-on actuation of the speed change pedal when a transmission drive output detected by the transmission output unit rotation sensor is no greater than a forward-reverse drive switching speed, and that the brake of the travel wheels is released when the activation of any of the forward drive clutch and reverse drive clutch is confirmed; wherein the control apparatus further comprises a speed change ratio setting device for setting a speed change ratio pattern of the hydraulic stepless transmission, and a pattern storage for storing a plurality of speed change ratio patterns; and wherein an output revolution speed of the hydraulic stepless transmission is controlled in accordance with a speed change ratio pattern set in advance by the speed change ratio setting device correspondingly to a step-on amount of the speed change pedal.