Method for controlling a motor vehicle powertrain
- Ypsilanti, MI
- Detroit, MI
- Farmington Hills, MI
A multiple forward speed automatic transmission produces its lowest forward speed ratio when a hydraulic clutch and hydraulic brake are disengaged and a one-way clutch connects a ring gear to the transmission casing. Second forward speed ratio results when the hydraulic clutch is engaged to connect the ring gear to the planetary carrier of a second gear set. Reverse drive and regenerative operation result when an hydraulic brake fixes the planetary and the direction of power flow is reversed. Various sensors produce signals representing the position of the gear selector lever operated manually by the vehicle operator, the speed of the power source, the state of the ignition key, and the rate of release of an accelerator pedal. A control algorithm produces input data representing a commanded upshift, a commanded downshift and a torque command and various constant torque signals. A microprocessor processes the input and produces a response to them in accordance with the execution of a control algorithm. Output or response signals cause selective engagement and disengagement of the clutch and brake to produce the forward drive, reverse and regenerative operation of the transmission.
- Research Organization:
- Ford Motor Company, Detroit, MI (United States)
- DOE Contract Number:
- AC07-85NV10418
- Assignee:
- Ford Motor Company (Dearborn, MI)
- Patent Number(s):
- US 4928227
- OSTI ID:
- 867399
- Country of Publication:
- United States
- Language:
- English
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Computer controlled synchronous shifting of an automatic transmission
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Related Subjects
controlling
motor
vehicle
powertrain
multiple
forward
speed
automatic
transmission
produces
lowest
ratio
hydraulic
clutch
brake
disengaged
one-way
connects
gear
casing
results
engaged
connect
planetary
carrier
set
reverse
drive
regenerative
operation
result
fixes
direction
power
flow
reversed
various
sensors
produce
signals
representing
position
selector
lever
operated
manually
operator
source
ignition
key
rate
release
accelerator
pedal
control
algorithm
input
data
commanded
upshift
downshift
torque
command
constant
microprocessor
processes
response
accordance
execution
output
selective
engagement
disengagement
response signal
signals representing
speed ratio
forward speed
control algorithm
automatic transmission
motor vehicle
power source
gear set
data representing
input data
ratio results
produce signals
reverse drive
various sensors
hydraulic clutch
hydraulic brake
power flow
clutch connects
operation result
one-way clutch
multiple forward
vehicle powertrain
speed automatic
transmission produces
vehicle power
various sensor
lowest forward
constant torque
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