Patent Number: 6,401,022

Title: Vehicle drive power control apparatus, and control method

Abstract: A vehicle drive power control apparatus and method control the speed ratio of a transmission based on a speed shift line that is set so that, within a practical region, the speed shift line is in a low revolution speed side of an optimal fuel consumption line determined based on the efficiency of the engine and the efficiency of the transmission. Therefore, the width of increase in revolution speed from the speed occurring at the beginning of the practical region is curbed. Hence, the fuel consumption resulting from inertia torques caused by fluctuations in engine revolution speed, that is, fluctuations in the revolution speed of the input shaft of the transmission and a fluidic power transfer mechanism, is reduced, so that the efficiency as a whole increases and the fuel economy improves in comparison with the case where the optimal fuel consumption line is used as a control basis.

Inventors: Kubota; Hirofumi (Mishima, JP), Mashiki; Zenichiro (Nisshin, JP), Takagi; Isao (Okazaki, JP), Tanaka; Hiroya (Nishikamo-gun, JP), Mitani; Shinichi (Susono, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: F16H 59/00 (20060101); F16H 61/00 (20060101); F16H 59/74 (20060101); B60K 041/12 (); F02D 029/00 (); F16H 061/02 ()

Expiration Date: 06/04/2019