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