Abstract: A traction control system for a vehicle with an automatic transmission eliminates acceleration slip of wheels by fuel-cut for stopping fuel supply to an engine upon occurrence of the acceleration slip. The automatic transmission is inhibited from shifting upon occurrence of an acceleration slip for which the fuel cut is carried out, so as to hold a current shift range, prevent the engine speed from lowering down to a fuel recovery speed, and thereby avoid occurrence of hunting of the traction control.

Abstract: A line pressure control system for an automatic transmission wherein a shift range is determined by selectively engaging friction elements by means of a line pressure controlled according to an input torque of said automatic transmission. In the present invention, an engine output torque at the front stage of the automatic transmission is estimated from the operating condition. The input torque of the automatic transmission is calculated from the estimated engine output torque and the operation state of a torque converter. The calculated input torque of the automatic transmission is decreased during a predetermined time corresponding to an estimation response delay of the engine output torque after the engine is made in a no-load state, so as to properly control the line pressure.

Abstract: An object of the present invention is to provide a sliding bearing having an excellent initial conformability and seizure resistance as well as desired durability and heat resistance required particularly for high speed engine. The present invention provides a sliding bearing having a resin coating layer comprising a thermosetting resin being soft and having a good elongation at high temperature and a solid lubricant formed on a bearing alloy layer.

Abstract: A device for limiting slip of a torque converter at its high temperature condition performs a slip limiting control by reducing slip rotation between an input element and an output element of the torque converter in a low-load operation region of an engine is carried out, or a lockup control for eliminating the slip rotation. The region of the slip control is expanded to a high-load operation region of the engine, when the temperature of torque converter hydraulic oil is not lower than a predetermined temperature.

Abstract: An object of the present invention is to provide a sliding bearing having an excellent initial conformability and seizure resistance as well as desired durability and heat resistance required particularly for high speed engine.

Abstract: A line pressure control system for an automatic transmission wherein a shift range is determined by selectively engaging friction elements by means of a line pressure controlled according to an input torque of said automatic transmission. In the present invention, an engine output torque at the front stage of the automatic transmission is estimated from the operating condition. The input torque of the automatic transmission is calculated from the estimated engine output torque and the operation state of a torque converter. The calculated input torque of the automatic transmission is decreased during a predetermined time corresponding to an estimation response delay of the engine output torque after the engine is made in a no-load state, so as to properly control the line pressure.

Abstract: A device for limiting slip of a torque converter at its high temperature condition performs a slip limiting control by reducing slip rotation between an input element and an output element of the torque converter in a low-load operation region of an engine is carried out, or a lockup control for eliminating the slip rotation. The region of the slip control is expanded to a high-load operation region of the engine, when the temperature of torque converter hydraulic oil is not lower than a predetermined temperature.

Abstract: A traction control system for a vehicle with an automatic transmission eliminates acceleration slip of wheels by fuel-cut for stopping fuel supply to an engine upon occurrence of the acceleration slip. The automatic transmission is inhibited from shifting upon occurrence of an acceleration slip for which the fuel cut is carried out, so as to hold a current shift range, prevent the engine speed from lowering down to a fuel recovery speed, and thereby avoid occurrence of hunting of the traction control.

Abstract: A sliding bearing, which comprises a lining and a bismuth or bismuth-alloy overlay having improved compatibility and fatigue resistance is provided. The overlay is characterized by the following orientation. The relative ratio of the X-ray diffraction intensity I[hkl] of the bismuth or bismuth-alloy overlay defined below satisfies the following conditions (a) and (b): (a) the relative ratio of the X-ray diffraction intensity I[hkl] of planes other than the {012} planes is from 0.2 to 5 times as high as the ratio of the X-ray diffraction intensity I[012], namely, 0.2I[012]≦I[hkl]≦5I[012] (b) the relative ratio of the X-ray diffraction intensity I[hkl] of three or more planes other than {012} planes ranges from 0.5 to 2 times as high as the ratio of the X-ray diffraction intensity I[012], namely, 0.5I[012]≦2I[012].

Abstract: A metallic sliding material including at least a support member with a sliding surface and an inorganic compound coating layer formed on the sliding surface is disclosed. The sliding surface is formed from an aluminum alloy or a reinforcing material-containing aluminum alloy. The inorganic compound coating layer is formed from at least one aluminum compound, and at least one phosphorus compound, and at least one member selected from the group of molybdenum compounds, tungsten compounds, and chromium compounds. These compounds are present in such concentrations that molybdenum, tungsten, and chromium collectively constitute 2 to 48% by weight of the inorganic compound coating layer, aluminum constitutes 1 to 25% by weight of the inorganic compound coating layer, phosphorus constitutes 1 to 25% by weight of the inorganic compound coating layer, and the balance of the inorganic compound coating layer is oxygen and impurities.

Abstract: A manual shift control system for automatic transmissions is so constructed as to carry out automatic shift control when a motor vehicle is found in the operation area where selection of a manual speed ratio is not allowed. Acceptance of the manual upshift or downshift command is prohibited until a predetermined time elapses after occurrence of automatic shift.

Abstract: An automatic transmission is provided with at least one friction element and a piston. The engagement of the friction element is proceeded in a manner that operating pressure is applied to an apply chamber to stroke the piston. The disengagement of the friction element is proceeded in a manner that operating pressure is applied to a cancel chamber to stroke the piston. The cancel chamber is disposed opposite to the apply chamber with respect to the piston and formed such that an outer diameter of a pressure receiving surface of said cancel chamber is generally the same as that of said apply chamber. Therefore, piston pushing force due to centrifugal force in the apply chamber is balanced with a piston reversely pushing force due to the centrifugal force in the cancel chamber. This prevents the friction element from being dragged during friction element disengaged condition.

Abstract: A high heat resisting and high abrasion resisting aluminum alloy and aluminum alloy powder have superior toughness, abrasion resistance, high temperature strength, and creep resistance and are useful to form engine parts for automobiles, airplanes, etc. The high heat resisting and high abrasion resisting aluminum alloy comprises 2 to 15 wt % of Ni, 0.2 to 15 wt % of Si, 0.6 to 8.0 wt % of Fe, one or two of 0.6 to 5.0 wt % of Cu and 0.5 to 3 wt % of Mg, the total amount of Cu and Mg being equal to or less than 6 wt %, one or two of 0.3 to 3 wt % of Zr and 0.3 to 3 wt % of Mo, the total amount of Zr and Mo being equal to or less than 4 wt %, 0.05 to 10 wt % of B, and the balance of Al and unavoidable impurities, and is produced by powder metallurgy.

Abstract: A method and apparatus for use with an automotive vehicle having an automatic transmission operable with a working fluid. The automatic transmission is coupled to an engine through a torque converter operable in a lockup mode where a mechanical connection is completed between the engine and the automatic transmission in response to a lockup command signal. A degree to which the working fluid is degraded is detected while the torque converter is operating in response to the lockup command signal which is produced when the vehicle speed exceeds a reference value. When the detected degree exceeds a predetermined value, the reference vehicle speed value is increased.

Abstract: A control system for a power train of an automotive vehicle prevents thermally overloaded state of a hydraulically controlled automatic transmission when a severe thermal load condition of an engine is maintained for a predetermined time. An engine controller is supplied with signals representing a throttle opening, an engine speed and a vehicle speed, and performs an engine torque reduction control when the transmission has been judged to be under a thermally overloaded condition, so as to prompt a driver to effect a downshifting and thereby eliminate an overloaded state of the transmission.

Abstract: An automatic transmission is provided with at least one friction element and a piston. The engagement of the friction element is proceeded in a manner that operating pressure is applied to an apply chamber to stroke the piston. The disengagement of the friction element is proceeded in a manner that operating pressure is applied to a cancel chamber to stroke the piston. The cancel chamber is disposed opposite to the apply chamber with respect to the piston and formed such that an outer diameter of a pressure receiving surface of said cancel chamber is generally the same as that of said apply chamber. Therefore, piston pushing force due to centrifugal force in the apply chamber is balanced with a piston reversely pushing force due to the centrifugal force in the cancel chamber. This prevents the friction element from being dragged during friction element disengaged condition.

Abstract: An automatic transmission includes first and second planetary gear sets, and a third planetary gear set which is closer to an output end of the transmission, and which is smaller in diameter than the first and second gear sets. One brake is disposed around the first and second planetary gear sets, and another brake has a pack of brake plates surrounding the smaller third planetary gear set. A transmission case is therefore made gradually smaller toward the output end. This planetary gear system makes it possible to arrange the brakes very compactly, and the tapered transmission case improves the rigidity of the automatic transmission.

Abstract: A structure of an automatic transmission includes first and second clutches which are arranged radially so that one is surrounded by the other. This arrangement can reduce the size of the automatic transmission. For example, the first clutch has a first clutch drum splined to an input shaft of the transmission, a first clutch hub, and a first clutch pack between the first clutch drum and hub. The second clutch has a second clutch drum received in, and splined to, the first clutch drum, a second clutch hub, and a second clutch pack therebetween. The second clutch pack is surrounded by the first clutch pack. The second clutch further includes a piston which encloses the first clutch drum and which has a pushing portion on one side of the second clutch pack and a pressure receiving portion on the opposite side.

Abstract: A lubricating system which is for an automatic transmission having planetary gear sets and producing various speeds by selectively engaging friction elements. The lubricating system is provided with a first lubricating circuit which usually supplies lubricant to planetary gear sets, bearings and the like, and a second lubricating circuit which supplies lubricant to friction elements during a shift.

Abstract: An automatic transmission includes a planetary gear system which are coaxially mounted on an intermediate shaft having a first end supported by an input shaft and a second end supported by an output shaft. For example, the planetary gear system includes three planetary gear sets which are all mounted on the intermediate shaft, and an engaging device group includes a combination of first and second clutches and a first brake which are all placed around the input shaft, and a combination of second and third brakes which are placed around the planetary gear sets. The three planetary gear sets are tightly arranged, leaving little or no intervening spaces, between both ends of the intermediate shaft. No clutches and brakes are interposed among the planetary gear sets. Therefore, it is possible to decrease the length of the intermediate shaft, and to reduce gear noises by improving the flexural rigidity of the intermediate shaft.