Multi-wire process upshift speed control method for automatic transmission

The present invention discloses a multi-speed upshift wire process control of an automatic transmission, which is detected by the electronic control unit D range switch signal, a vehicle speed signal v by the vehicle speed sensor, an accelerator pedal position sensor determines whether the opening degree signal α rose from a need to block two block by two block was raised to third gear, the fourth gear third gear raised, the electromagnetic clutch is energized and the current control process of each upshift. Third speed to second speed raised, for example, by the electronic control unit in a fixed control period T23, while the electromagnetic clutch is energized by the third gear function of the current I3b (t) = {I3,0≤t≤Tδ; kI3 + I3 (1-k ) (t-Tδ) / (T23-Tδ), Tδ clutch third gear, second gear, and at the same time the electromagnetic clutch is energized by the current function I2b (t) = {I2,0≤t≤ βTδ; 0, βTδ clutch current, wire process control to achieve an upshift of the automatic transmission; the upshift process control can be avoided only interrupted during the upshift engine input power, and shift shock can be avoided to achieve a smooth upshift the automatic transmission wire.