Controller for oil pressure of automatic transmission

Abstract

Abstract PURPOSE: To conduct different kinds of oil pressure to a plurality of hydraulic servomechanisms for engine braking, through a simple hydraulic control circuit, by providing a modulator valve which regulates the pressure of a line at the time of engine braking of a vehicle and by conducting the output oil pressure of the modulator valve to the hydraulic servomechanisms. CONSTITUTION: A modulator valve 250, which regulates the pressure of a line, is provided in an oil passage which is used to conduct the pressure of the line to a 1-2 shift valve 220, a 2-3 shift valve 230 and a 3-4 shift valve 240 through a manual valve 210 which is used to manually perform speed changing at the time of engine braking of a vehicle. The output oil pressure of the modulator valve 250 is conducted through the shift valves 220, 230, 240 to hydraulic servomechanisms 24A, 25A, 25B, 26A, 27B, 12A, 19A, 40A for a plurality of frictionally engaged elements for the engine braking. According to this constitution, only one modulator valve 250 is needed. Therefore, a circuit is simplified. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Nobuaki Miki
• 👤 Haruki Takemoto

Bibliographic Details