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DIRECT ELECTRONIC SHIFT CONTROL OPERATION

BHE051318901T10

• In the previous system, line pressure passages are switched with a combination of on/off shift solenoids and shift valves to engage the clutch. In the new system, clutch pressure is regulated for each clutch and brake with a combination of duty cycle shift solenoids and amplifier valves.

• When shifting from 2GR→ 3GR, 3GR→ 4GR, 3GR→ 2GR, 4GR→ 3GR, engagement- and release-side clutch pressures are simultaneously controlled according to throttle opening angle and vehicle speed, as well as clutch pressure supply and extent of gear shift. As a result, the capacity of torque for both clutches can be regulated optimally during switching of clutch pressure (switching of engagement clutch) to prevent engine flare-up and dragging during shifting for smooth and responsive shifting.

1 | Direct electronic shift control
2 | Pressure regulator valve
3 | Oil pump
4 | Drain
5 | Spring
6 | Amplifier valve
7 | Clutch
8 | Previous
9 | Manual shift valve
10 | Accumulator
11 | Duty cycle solenoid
12 | On/off solenoid
13 | Solenoid pressure
14 | Lower passage opens when solenoid pressure acts
15 | Upper passage opens when solenoid pressure does not act