摘要:
A manual valve control for a multi-speed vehicle transmission is provided. Electronic and hydraulic components are provided, including trim valve systems that are multiplexed by a shift valve and a manual valve. The trim valves and shift valve are self-diagnosing via a plurality of multiplexed pressure switches. The control enables single and double range shifts among the multiple forward speed ratios, including shifts to and from sixth and higher forward ratios, reverse and neutral. The control also includes a reduced engine load at stop feature. In addition, a power off/limp home feature provides a plurality of failure modes, including a failure mode for sixth and higher forward speed ratios.
摘要:
A variator lockout valve system for a continuously variable transmission includes a pair of shift valves. Each shift valve has at least one port that is fluidly coupled to a variator of the continuously variable transmission. Electro-hydraulic actuators control the position of each of the shift valves. When the shift valves are in one position, pressure control valves supply fluid pressure to the variator. If one of the shift valves is in another position, one of the pressure control valves is blocked from supplying fluid pressure to the variator.
摘要:
A fail-to-neutral diagnostic technique for a transmission that includes a variator may include monitoring a state of a pressure differential valve fluidly coupled to a high side pressure applied to at least one actuator coupled to at least one corresponding roller of the variator and also fluidly coupled to a low side pressure applied to the at least one actuator, determining from the state of the pressure differential valve a variator torque sign corresponding to whether torque transferred by the at least one roller is positive or negative, determining an expected variator torque sign based on current operating conditions of the transmission, and commanding the transmission to a true neutral condition if the determined variator torque sign is different from the expected variator torque sign.
摘要:
A device for removing ferrous particulates from an oil stream within a motor vehicle includes a passage through which the oil stream flows and a magnet disposed within the passage. The passage defines a cavity in which the magnet is housed. The passage defines a substantially ninety-degree bend, such that particles suspended within the oil stream are propelled into the magnet before continuing along the passage. Preferably the device is disposed upstream of vehicle control valves, such that debris is removed from the oil stream prior to travel through the valves. Preferably, the cavity defines an overhang, which may be magnetic, with the overhang securing the magnet within the cavity and preventing particulates from re-entering the oil stream. An opening within the passage preferably defines the ninety-degree bend. The opening may be at least partially defined by the cavity. The magnet is preferably configured to be replaceable, removable, or both.
摘要:
Various embodiments of methods, apparatus and systems that diagnose and/or detect faults of an electro-hydraulic control system for a transmission are presented. Some embodiments, adjust a main line pressure of the electro-hydraulic control system and detect faults based upon changes in a pressure switch resulting from such adjustments of the main line pressure. The pressure switch may be incorporated into a control main valve or a clutch trim valve of the electro-hydraulic control system.
摘要:
A torque converter coupled to a transmission has a torque converter operating mode and a lockup operating mode. A first pump may be configured to supply transmission fluid to a plurality of electro-hydraulic transmission components. A second pump may be configured to supply transmission fluid to a lubrication system of the transmission. A valve may be configured to route transmission fluid supplied by the second pump through the torque converter during the torque converter operating mode. Means may also be provided for selectively routing at least some of the transmission fluid supplied by the first pump through the torque converter. Illustratively, transmission fluid supplied by the first pump may, but need not, be routed to the torque converter only during the torque converter operating mode or only during the torque converter operating mode if the temperature of transmission fluid exiting the torque converter exceeds a threshold temperature.
摘要:
The present invention provides a control system employing a single solenoid valve operable to provide a variable fluid flow to effect cooling if the motor/generator assemblies contained within an electrically variable hybrid transmission. The control system of the present invention selectively controls the cooling of at least one motor/generator assembly of an electronically variable hybrid transmission by selectively controlling valves of various types and configurations.
摘要:
A transmission having a shaft driven by a prime mover such as an engine or motor is provided. The transmission includes a first stationary element for supporting the shaft for rotation, and a torque transmitting device connectable to the shaft and rotatable about an axis. The torque transmitting device is actuated by a hydraulic fluid. A first passage is connected to the torque transmitting device and is in communication with the hydraulic fluid. The first passage extends radially inward from the torque transmitting device. A vent passage is located within the first stationary element and is in communication with the first passage. Rotation of the torque transmitting device about the axis separates entrained air from the fluid and urges air radially inward through the first passage and into the vent passage, thereby removing air from the hydraulic fluid and circuit.
摘要:
A powertrain has an electrically variable hybrid transmission having an electro-hydraulic control system, plurality of electrical power units, and a plurality of torque transmitting mechanisms selectively engageable by the electro-hydraulic control system to provide four forward speed ranges, a neutral condition, an electric low and high speed mode, an electrically variable low and high speed mode, and a hill hold mode. The electro-hydraulic control system includes a multiplexed pressure switch system. The multiplexed pressure switch system of the present invention allows position detection of six torque transmitting mechanism control valves through the use of only four pressure switches.
摘要:
A wiring harness shroud for use in a harsh environment to provide precise routing and protection for wire bundles. The wiring harness shroud comprises a U-channel having a base and two substantially parallel side walls within which one or more wire bundles may be received. The side walls have opposed and registered receiving slots within which a mounting member is demountably secured. The mounting member serves not only to secure the shroud but also to retain the wire bundles within the U-channel.