Forward Deceleration 12Wd); Reverse Start And Acceleration (4Wdi) - Honda CR-V 1997 Service Manual

Forward Deceleration 12WD)
During forward deceleration, the dual pump system functions in two wheel drive mode.
Because of braking characteristics, the speed of the rear wheels may exceed the speed of the front wheels during deceler-
ation. If so, the rear oil pump spins faster than the front oil pump.
Fluid discharged by the rear oil pump is simply drawn in again by the rear pump and reci rculated. Because there is no
pressure built up at the clutch piston, the clutch piston does not engage, and the vehicle remains in 2WD (front wheel
drive).
REAR PUMP
Reverse Start and Acceleration (4WDI
During reverse start and reverse acceleration , the dual pump system can engage four wheel drive.
If the front wheels spin faster than the rear wheels, the front oil pump spins faster than the rear oi l pump. The front oil
pump draws in fluid through check valve A and discharges it. (Note that in reverse, the direction of the pumps is the oppo-
site of that during forward driving .)
Some of the fluid that is discharged
by
the front oil pump is drawn in
by
the rear oil pump. The remaining fluid passes
through check valve F into the cylinder of the clutch piston, where it is regulated by two orifices.
The regulated hydraulic pressure at the clutch piston may force the plates and discs of the clutch together to form a con-
nection . The engaged clutch passes driving force from the transfer assembly to the rear wheels, producing 4WD.
ORIFICES
OIL PUMP
(conrd)
15-7