Abstract:
Device for transmitting motion to the wheels of a vehicle having drive axles by means of two motors generating the driving power, one motor driving a speed reducing mechanism associated with each drive wheel of the vehicle and the other motor also driving one of the reduction mechanisms, the motors and mechanisms constituting jointly a kinematic chain disposed at the outer periphery of the frame of the vehicle for transmitting the torque to the drive wheels thereof. A member for driving one of the wheels is adapted to transmit the driving power from one input member of the mechanism to an output member of the same mechanism, both input and output members being driven from a separate transmission member, a brake of the driving member being provided for decelerating said wheel.
Abstract:
Modulated hydraulic clutch pack engagement is provided in a single valve body which includes a drive direction selector spool, a dump valve, a pressure modulating spool, a downstream system pressure regulator and a provision for continuous flow to a downstream torque converter. The modulator spool interrupts communication between a first and second chamber. Fluid pressure develops in the first chamber in response to selector spool initiation of clutch pack fill line pressure. A pressure differential is generated between the first and second chambers resulting in modulator spool displacement allowing equalization of chamber pressures. Metered flow to the back side of the modulator spool generates pressure that reseats the spool with the aid of spring pressure. Pressure then builds in the first chamber. The modulation is repeated rapidly resulting in the clutch pack being fully pressurized, however, the modulator will continue to regulate fluid to be supplied to the torque converter.The dump pedal allows dumping of the pressurized clutch pack without interrupting flow between the supply pump and the torque converter.
Abstract:
In a hydro-mechanical transmission for automobiles which has an input shaft, an output shaft, a differential gear set including an input element connected to the input shaft and an output element connected to the output shaft and two reaction elements, a first positive displacement hydraulic pump-motor connected to the input shaft, a second hydraulic pump-motor connected to the first hydraulic pump-motor through a pair of conduits, a first clutch for performing the low operational mode of the low speed ratio by connecting the second hydraulic pump-motor to one of the two reaction elements, and a second clutch for performing the high operational mode of the high speed ratio by connecting the second hydraulic pump-motor to the other reaction element, the operational modes being switched over when the rotational speed of the first clutch corresponds to or is synchronized with that of the second clutch, the improvement being, whether a setting signal is generated for increasing or decreasing the speed ratio, the signal is detected simultaneously with the correspondence of the rotational speed of each clutch, and upon correspondence thereof, the clutches are operated so as to perform the high operational mode when the setting signal is for increasing the speed ratio and to perform the low operational mode when the setting signal is for decreasing the speed ratio.
Abstract:
A drive train includes a hydrostatic transmission unit and a multiple speed range transmission unit arranged in series between a prime mover and a primary output shaft, variable displacement and torque transmitting capacity of the hydrostatic transmission unit being adjusted by hydraulic controls including a speed control valve for developing a differential pressure signal proportional to a desired rate of operation, a modulating valve for regulating the differential pressure signal corresponding to accelerating and decelerating operation of the transmission, a directional control valve for determining the direction of operation of the hydrostatic transmission unit, and a range selector valve for shifting the operating speed range of the multiple speed range transmission as the hydrostatic transmission approaches a limit of displacement, the displacement of the hydrostatic transmission being automatically reset in response to shifting of the multiple speed range transmission.Operating speed limits are automatically established for the drive train by an override speed control valve which manually adjusts the differential pressure signal for reduced torque transmission through the drive train when the prime mover is operating below a minimum speed. A speed limiting control valve responds to operation of the prime mover above a maximum selected speed for automatically applying a brake within the drive train in order to supplement dynamic braking capacity of the transmission unit, the speed limiting control valve including means producing a feedback signal for resisting manual operation of the override speed control valve in proportion to engagement of the brake within the drive train.
Abstract:
Hydraulic controls in a transmission for engaging a clutch for the F-R, or forward or reverse, direction before a clutch for first, second, or third speed. Flow of hydraulic fluid to each direction clutch and to each speed clutch is by way of a reducing valve which modulates fluid pressure in controlled way by throttling the flow. After the power unit for the clutch for the F-R clutches and the power unit for the clutch for first, second or third speed are filled with fluid by the reducing valve, pressure in the power units is then slowly raised by the valve linearly toward is maximum; for this purpose the hydraulic controls are supplied by a single source of hydraulic fluid and operate therefrom to provide a pair of modulated pressure outputs which are maintained with varying differences throughout their range of operation, and which operate the selected one of the F-R clutches and the selected one of the first second or third clutches. The F-R clutches are the ones which receive the higher modulated pressure output and which are constructed, proportioned in size, and arranged to have a higher speed capability and smaller energy absorbing capacity in their design, and they operate so as to be fully hydraulically engaged at the higher pressure output, and hence slightly before, the speed clutches.
Abstract:
An engine control device can include a throttle valve for adjusting an amount of air supplied to an engine, operation amount detecting sensors for detecting an operation amount of a throttle lever, a motor for driving the throttle valve between open and closed positions according to detection values of the operation amount detecting sensor 21a or the like, and throttle opening detecting sensors for detecting an opening of the throttle valve is provided with a limp-home mechanism for keeping the throttle valve in a mechanically neutral position when an abnormality occurs. When the throttle valve is in the mechanically neutral position, an ignition timing control can be switched in a stepwise manner over a predetermined time period from a regular ignition timing control to a limp-home ignition timing control.
Abstract:
A shift control system for a V-belt type continuously variable transmission is provided. The shift control system comprises a controller programmed to store an actual transmission ratio of the continuously variable transmission at stop of an associated vehicle drive source, and inhibit, at restart of the vehicle drive source, an initializing operation for returning an operational position of the shift actuator to a standard position when the actual transmission ratio is more on a high-speed side than a predetermined transmission ratio. A shift control method is also provided.
Abstract:
An apparatus and a method to stably run an electrically operated vehicle is disclosed. The invention has an electric generator target torque calculation processor, a first determination processor for calculating an inertia correction determining value, a second determination processor for calculating an integral term correction determining value, a determining mode switching condition judgment processor, and a drive motor target torque calculation processor. When a determining mode switching condition exists, the drive motor target torque calculation processor switches between a first determining mode for calculating drive motor target torque, and a second determining mode for calculating the drive motor target torque. When the determining mode switching condition exists, the first determining mode and the second determining mode are switched so that the drive motor target torque is calculated on the basis of the integral term correction determining value.
Abstract:
In outboard motor mounted on a stern of a boat and equipped with an internal combustion engine at its upper portion and a propeller at its lower portion that is powered by the engine to propel the boat, having a throttle actuator moving a throttle valve installed at an air intake pipe of the engine for regulating an amount of air to be sucked into the engine to change a boat running speed, a shift actuator rotating a shift rod connected to a clutch such that the clutch moves from a neutral position to engage with at least one of a forward gear and a reverse gear, a steering actuator rotating a swivel shaft installed in the outboard motor such that the outboard motor is steered relative to the boat, a group of devices (i.e., a steering grip, a shift/throttle lever, etc.) is installed at a position other than the boat and each operable by an operator to generate a signal indicating that the operator's instruction to operate at least one of the actuators is inputted. The group of devices is installed on a control panel that is installed at the stern brackets that connect the outboard motor to the boat, or is installed at a bar handle fastened to the stern brackets.
Abstract:
An engine control system and a method control the engine speed of a watercraft that is propelled by a stream of water generated by propulsion unit driven by an engine. The system and method detect whether the propulsion unit is generating the stream of water. The system and method limit the maximum engine speed to a first speed when the propulsion unit is generating the stream of water and limit the maximum engine speed to a second speed, lower than the first speed, when the propulsion unit is not generating the stream of water.