Patent ID: 7311638
Filing Date: 2007-12-25
Classification: B60W,F16D,F16H,Y10T

Abstract:
1. A mechanical automatic transmission apparatus for a vehicle comprising: an engine; a transmission for outputting drive force to an output system of the vehicle; a clutch interposed between the engine and the transmission and selectively transmitting drive force from the engine to the transmission; an operating condition detection element for detecting operating conditions of the vehicle; a gear shift map storing target gear positions determined on the basis of the operating conditions of the vehicle; a gear shift control element for activating the clutch and the transmission so as to perform gear shift, when a different target gear position is selected from the gear shift map on the basis of the operating conditions of the vehicle detected by the operating condition detection element; a clutch load detection element for detecting load acting on the clutch; and a running resistance estimation element for estimating running resistance acting on the vehicle at the time of start of the vehicle from the load which acts on the clutch during a partially engaged period after start of the vehicle and which is detected by the clutch load detection element, wherein the gear shift control element prohibits gear shift and holds an initial gear position when the running resistance estimated by the running resistance estimation element is greater than a predetermined value.