초록 ▼

In an electronic-hydraulic control mechanism of an automatically shifting motorcar transmission, control valves (88, 70, 65, 67, 91 and 94) are coordinated with actuation devices (81 to 87) of hydraulically engageable and disengageable friction clutches or brakes (A to E1). The pressure level in one

In an electronic-hydraulic control mechanism of an automatically shifting motorcar transmission, control valves (88, 70, 65, 67, 91 and 94) are coordinated with actuation devices (81 to 87) of hydraulically engageable and disengageable friction clutches or brakes (A to E1). The pressure level in one main pressure system of the control mechanism is regulated by a main pressure valve (29) while a control unit (72) designed as microprocessor controls the actuation devices via electrically actuated solenoid valves (41, 42 and 43) and pressure-control valves (38, 39 and 40) in accordance with operation parameters of the motorcar transmission and of a drive engine, the same as of a shift and/or travel program control. To provide an electronic-hydraulic control system in which the control operations develop under control, at low construction cost, the pressure control valves (38, 39 and 40) are situated in a first control system (36) of reduced pressure compared to the main pressure system (lines 25 and 34) through which they act with pilot control upon the control valves (65, 67, 70 and 94) and the main pressure valve (29) while the solenoid valves (41, 42, 43) are situated in a second control system (44) of likewise reduced pressure compared to the main pressure system, said solenoid valves (41, 42, 43) acting with pilot control upon shift valves (28, 30, 47) which control the feeding of pressurized fluid from the main pressure system to the pressure valves (65, 67, 70, 94).

대표청구항 ▼

An electronic-hydraulic control mechanism, for a vehicle having an automatically shifting transmission, comprising: a transmission shifting mechanism having a plurality of hydraulically engagable and disengagable components (A, B, C D, E1, E2 and F), each of said plurality of engagable and disengaga

An electronic-hydraulic control mechanism, for a vehicle having an automatically shifting transmission, comprising: a transmission shifting mechanism having a plurality of hydraulically engagable and disengagable components (A, B, C D, E1, E2 and F), each of said plurality of engagable and disengagable components being connected to a corresponding actuation device (81, 82, 83, 84, 85, 86, and 87), each of said actuation devices being hydraulically connected to a shift control valve (65, 67, 70, 88, 91 and 94), and each of said shift control valves (65, 67, 70, 88, 91, and 94) being connected to at least one of a plurality of pressure control valves (38, 39, 40), a plurality of shift valves and a plurality of electrically actuated solenoid valves (41, 42, 43); said solenoid valves (41, 42, 43) and said pressure control valves (38, 39, 40) being electrically connected to a central control unit (72), and said central control unit, depending on operation parameters of the transmission and on operation parameters of an engine, controlling said solenoid valves (41, 42, 43) and said pressure control valves (38, 39, 40) to select a desired gear of the transmission; a main pressure control valve (29) for regulating a main pressure in a main pressure system (lines 25 and 34), said main pressure system being hydraulically connected to at least one of said shift valves and said shift control valves for supplying pressurized fluid thereto; wherein said pressure control valves (38, 39, 40) are situated in a first secondary hydraulic control system (36) which has a pilot pressure that is of a reduced pressure compared to said main pressure (lines 25 and 34), said pressure control valves (38, 39, 40) are controlled by said central control unit (72) to supply pilot pressure to desired ones of said shift control valves and control supply of main pressurized fluid through said shift control valves (88, 91, 65, 67 and 94) to said actuation devices (81, 82, 83, 84, 85, 86, and 87); and said solenoid valves (41, 42, 43) are situated in a second secondary control system (44) which has a pilot pressure that is of a reduced pressure compared to that of the said main pressure (lines 25 and 34), and said solenoid valves are controlled by said central control unit (72) to supply pilot pressure to desired ones of said shift valves and control supply of pressurize fluid through said shift valves to said shift control valves (65, 67,70, 94, and 88).