Method for controlling automatic speed transmission for vehicle
A technology of automatic transmission and control method, which is applied in the direction of transmission control, control device, vehicle components, etc., can solve the problems that cannot be solved in automatic transmission, etc., and achieve the effects of improving fuel consumption rate, preventing local wear, and reducing the shock of shifting
Inactive Publication Date: 2006-03-29
DAIHATSU MOTOR CO LTD
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Problems solved by technology
However, according to the control method described in Patent Document 1, the problems of general automatic transmissions cannot be solved.
Method used
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Embodiment Construction
[0035] figure 1 It is a system diagram of a vehicle equipped with the automatic transmission for vehicles of the present invention.
[0036]The output of the engine 1 is transmitted to the transmission mechanism 4 via the torque converter 3 of the automatic transmission 2 , and the transmission mechanism 4 is connected to wheels (not shown) through the output shaft 5 . The automatic transmission 2 has an oil pump 6 driven by the engine 1 through the torque converter 3 , and the discharge pressure of the oil pump 6 is sent to the oil pressure control device 7 . The hydraulic control device 7 includes first to third solenoid valves 21 to 23 for shifting control, and by controlling these solenoid valves 21 to 23 by the AT controller 20 , various frictional engagement elements built in the shift mechanism 4 are controlled. The hydraulic pressure of the motor is controlled according to the driving state, and a plurality of gear positions, which will be described later, are switche...
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This automatic transmission has a plurality of engaging elements C1 to C3, B1 and B2 and a planetary gear device 11, and has a plurality of shift stages, and is constituted so that one of the plurality of shift stages is the direct-coupled stage for not relatively rotating the planetary gear of the planetary gear device 11, and the other one is a higher speed stage than the direct-coupled stage, and has an OD switch 29 for manually switching shift prohibition and permission to this high speed stage. The OD switch 29 exists in a shift prohibiting position to the high speed stage, and when the direct-coupled stage is continued for a prescribed time or more, a shift to the high speed stage is permitted by automatically releasing the shift prohibition to the high speed stage of the OD switch 29, and the local abrasion is prevented by relatively rotating the planetary gear. To provide a shift control method of a vehicular automatic transmission for preventing a local abrasion of a planetary gear only by changing a program when continuously operated over a long time by a direct-coupled stage.
Description
technical field [0001] The invention relates to a control method of a vehicle automatic transmission, in particular to a method for reducing fretting wear of a direct gear. Background technique [0002] Generally speaking, an automatic transmission for a vehicle is provided with a plurality of coupling elements and planetary gear devices. According to the operating conditions such as the vehicle speed and the opening of the throttle valve, the shift speed is automatically determined from the speed change graph, and the coupling elements are selectively coupled to This rotates the planetary gear unit in a predetermined direction, and controls a desired gear speed. For example, in the case of an automatic transmission having a forward 4-speed shift stage, the 3rd-speed stage is often a direct stage in which the planetary gears of the planetary gear device do not rotate relative to each other. [0003] Planetary gears, as well known, are composed of sun gears, pinions, ring ge...
Claims
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IPC IPC(8): F16H61/12F16H61/08F16H59/70F16H61/02B60K20/00F16H59/08F16H63/12
Inventor 西野治彦渡濑久朗人见贯也
Owner DAIHATSU MOTOR CO LTD