Abstract: A family of transmissions has four planetary gear sets, five controllable clutches and brake, and a passive one way brake. Selective engagement of the brakes and clutches in combinations of three produces eight forward speed ratios and one reverse speed ratio. The passive one way brake is engaged in the first forward speed ratio and overruns in the second through fifth forward speed ratios.

Abstract: A transmission gearing arrangements produces up to ten forward and one reverse speed ratios by selective engagement of various combinations of four shift elements. Each disclosed transmission includes four planetary gear sets and at least six shift elements. One of the shift elements may be a dog clutch. Optional passive one way brakes simplify the control.

Abstract: A family of transmission gearing arrangements produces up to ten forward and one reverse speed ratios by selective engagement of various combinations of three or four shift elements. Each disclosed transmission includes four planetary gear sets and six shift elements. Two of the shift elements can be brakes.

Abstract: A dual clutch transaxle provides eight forward gear ratios and two reverse gear ratios. The gears are arranged in seven gear planes. Four coupler assemblies are arranged to selectively sequentially engage each adjacent pair of the eight forward gear ratios to permit shifting among the eight forward gear ratios with continuous transmission of torque through the transaxle.

Abstract: A vehicle includes a motor/generator, a starter motor, a disconnect clutch disposed between the engine and the motor/generator, and at least one clutch disposed between the motor/generator and the vehicle drive wheels. When an engine start is requested, various parameters are controlled to ensure a smooth engine start wherein driveline torque disturbances are minimized. The starter motor is used to crank the engine upon an engine start request, thereby eliminating the need to transfer torque from the motor/generator to the engine. This helps to further reduce torque disturbances in the driveline when the engine is started.

Abstract: Four planetary gear sets, three rotating clutches, and two brakes can be arranged to produce eight forward speed ratios and a reverse speed ratio. The first and fourth gear sets can be substantially coplanar with each other, and the second and third gear sets can be substantially coplanar with each other. The lowest forward speed ratio could be suitable for use as a special purpose low range ratio, while the remaining seven forward ratios can provide adequate span for normal driving.

Abstract: A family of transmission gearing arrangements produces up to ten forward and one reverse speed ratios by selective engagement of various combinations of three or four clutches. Each disclosed transmission includes four planetary gear sets and six clutches. Two of the clutches can be brakes.

Abstract: An automatic transmission is disclosed providing eight forward ratios and one reverse ratio wherein the first forward ratio is selected by engaging exactly one friction brake using an electro-mechanical actuator. An operating method is disclosed for a vehicle having a transmission with this characteristic. The disclosed operating method permits the engine to be shut off to save fuel while the vehicle is stationary and then to start moving before an engine driven pump creates hydraulic pressure to engage the clutches.

Abstract: The present disclosure relates to a control circuit for a vehicle transmission cooling system having a controller configured to control an air compressor to selectively pressurize a transmission clutch housing and provide air to an alternative vehicle subsystem (or subsystems).

Abstract: An automatic transmission is disclosed providing eight forward ratios and one reverse ratio wherein the first forward ratio is selected by engaging exactly one friction brake using an electro-mechanical actuator. An operating method is disclosed for a vehicle having a transmission with this characteristic. The disclosed operating method permits the engine to be shut off to save fuel while the vehicle is stationary and then to start moving before an engine driven pump creates hydraulic pressure to engage the clutches.

Abstract: The present disclosure relates to a control circuit for a vehicle transmission cooling system having a controller configured to control an air compressor to selectively pressurize a transmission clutch housing and provide air to an alternative vehicle subsystem (or subsystems).

Abstract: A multiple speed power transmission, comprising: a gearbox input shaft; an output shaft; and a collection of gears, friction clutches, and passive couplers capable of transmitting power from the gearbox input shaft to the output shaft with eight forward speed ratios and one reverse speed ratio wherein the first forward speed ratio is selected by engaging friction brakes using electromechanical actuators.

Abstract: A multiple speed transmission includes an input and output; a first, second, third and fourth planetary gear sets, each gear set including a sun gear, a ring gear, a carrier, and pinions supported on the carrier and meshing with the sun gear and the ring gear; a first epicyclic gearing assembly including the first gear set, the second gear set, a first clutch, a second clutch, a first brake, and first, second, third and fourth rotating members, said first clutch being operable to couple said first rotating member to the input, said second clutch being operable to couple said second rotating member to the input, and said first brake being operable to hold said fourth rotating member against rotation; and a second epicyclic gearing assembly including the third gear set, the fourth gear set, a third clutch, a second brake, a third brake, and fifth, sixth, seventh and eighth rotating members, the third rotating member being secured to the eighth rotating member, said third clutch being operable to couple said sev

Abstract: A gear actuation mechanism for an automatic transmission, comprising: a motor; first and second gear actuation shafts; means of selecting one power path from each of two sets of power paths in response to rotation of the first and second actuation shafts, respectively; and means of alternately driveably connecting the motor to either the first gear actuation shaft or the second gear actuation shaft.

Abstract: A multiple speed power transmission comprising: four epicylic gearing assemblies each having first, second, and third rotating elements with specified interconnections, an input shaft, an output shaft, three clutches, and two brakes. Clutches and brakes are applied in combinations of three to produce eight forward ratios and one reverse ratio.

Abstract: A vehicle includes a motor/generator, a starter motor, a disconnect clutch disposed between the engine and the motor/generator, and at least one clutch disposed between the motor/generator and the vehicle drive wheels. When an engine start is requested, various parameters are controlled to ensure a smooth engine start wherein driveline torque disturbances are minimized. The starter motor is used to crank the engine upon an engine start request, thereby eliminating the need to transfer torque from the motor/generator to the engine. This helps to further reduce torque disturbances in the driveline when the engine is started.

Abstract: A multiple speed power transmission comprising: four epicyclic gearing assemblies each having first, second, and third rotating elements with specified interconnections, an input shaft connected to one of the rotating elements, an output shaft, two rotating clutches releasably connecting the input shaft to rotating elements, and four brakes selectively holding rotating elements against rotation. Clutches and brakes are applied in combinations of two to produce eight forward ratios and one reverse ratio.

Abstract: A multiple speed power transmission comprising: four epicylic gearing assemblies each having first, second, and third rotating elements with specified interconnections, an input shaft, an output shaft, three clutches, and two brakes. Clutches and brakes are applied in combinations of three to produce eight forward ratios and one reverse ratio.

Abstract: A multiple speed power transmission, comprising: a gearbox input shaft; an output shaft; and a collection of gears, friction clutches, and passive couplers capable of transmitting power from the gearbox input shaft to the output shaft with eight forward speed ratios and one reverse speed ratio wherein the first forward speed ratio is selected by engaging friction brakes using electromechanical actuators.

Abstract: A gear actuation mechanism for an automatic transmission, comprising: a motor; first and second gear actuation shafts; means of selecting one power path from each of two sets of power paths in response to rotation of the first and second actuation shafts, respectively; and means of alternately driveably connecting the motor to either the first gear actuation shaft or the second gear actuation shaft.