摘要:
Disclosed is an internal combustion engine comprising a carburetor and a secondary air feed control valve for feeding secondary air into the exhaust system of the engine from the air pump driven by the engines. The engine further comprises a temperature detector for indicating whether the warm-up of the engine is completed, and a gear position detector for indicating whether the shift gear of the transmission of the engine is in the top gear position. A relatively lean air-fuel mixture is fed into the cylinder of the engine and a relatively small amount of secondary air is fed into the exhaust system when the shift gear of the transmission is in the top gear position after completion of the warm-up of the engine.
摘要:
A digital automatic control for a change-speed transmission receives digitally coded electrical signals from a gear selector and automatically shifts transmission gears, up to the maximum speed selected, to maintain transmission speed within a range which will assure the most efficient use of available engine power.
摘要:
The power train between the engine and drive wheels of a motor grader, for example, comprises a normally engaged main engine clutch, a high-low power shift range transmission, and a four speed reversible power shift main transmission. The main engine clutch is releasable manually by a clutch pedal or releasable automatically by a hydraulically operated clutch release cylinder. The range transmission is shiftable into high or low by supplying hydraulic fluid to power shift clutches therein. The main transmission is shiftable into forward, reverse or neutral by manual operation of a direction selector valve. The main transmission is also shiftable into each of its speed ranges by axially moving the spool of a speed selector valve. The spool of the speed selector valve is axially movable into four positions by a hydromechanical linkage comprising three hydraulic shift cylinders.A fluid logic control system is provided to operate the main engine clutch, the range transmission and the main transmission automatically in a predetermined sequence so as to provide eight speed ranges in either forward or reverse. The control system comprises a high range shifter valve; a low range shifter valve; and an engine clutch sequence valve which operate in concert in response to manual operation of the spool of a speed control valve (having eight speed positions and neutral) to supply fluid to operate the engine clutch release cylinder and the range transmission shift clutches in a predetermined sequence. The three hydraulic shift cylinders are operated by the speed control valve. In accordance with the sequence, the normally engaged main engine clutch is automatically disengaged while either of the transmissions is undergoing a shifting operation so as to provide for smoother shifting and to relieve loads on the power shift clutches in the transmission. Furthermore, the range transmission automatically shifts twice (high and low) in each of the four speed ranges of the main transmission to provide a total of eight possible speed ranges.
摘要:
An improved method, and device for controlling fluid pressure in an automatic speed-changer including first and second friction engagement means for establishing a low-speed driving ratio and a high-speed driving ratio, respectively, and means for regulating the line pressure in a manner such that a low line pressure is delivered therefrom while the first and the second friction engagement means are switched therebetween, the improvement wherein the delivery of the low line pressure from the line pressure regulating means is caused to occur only after a fluid pressure supplied to the friction engagement means to be newly operated has reached a predetermined value, and the line pressure is again elevated to a value sufficient to assure the engagement thereof when the fluid pressure exceeds a second predetermined value.
摘要:
A control system for controlling the level of hydraulic pressure to be supplied to a serve mechanism of a friction element of an automotive automatic power transmission, which control system is arranged to have a conduit means hydraulically connecting a regulator valve to a shift valve for admitting the hydraulic pressure to be exerted on a valve spool of the shift valve to the regulator valve so that the hydraulic pressure is applied on a valve spool of the regulator valve to move the same to a position to decrease the level of the hydraulic pressure before the coupling of the friction element whereby a smooth coupling of the friction element is obtained.
摘要:
An interlock circuit is provided for use with machines to prevent starting of the prime mover unless an interlock switch is in a safe condition. In the illustrative embodiment the interlock circuit is adapted to prevent starting of the engine of a lawn tractor unless the clutch thereof is disengaged. After the engine is started the clutch may be engaged without killing the engine. The circuit comprises a controlled rectifier connected across the magneto primary coil through a rectifier. The voltage pulses applied across the output of the controlled rectifier are also applied to the gate thereof through a capacitor in a charging circuit which includes the input of the controlled rectifier. The interlock switch is connected across the input of the controlled rectifier and when it is opened, as by engagement of the clutch, the applied voltage pulses to the input of the controlled rectifier through the charging circuit causes the controlled rectifier to conduct on each pulse. Accordingly the ignition system is disabled and the engine cannot be started. When the interlock switch is closed the input of the controlled rectifier is short circuited and the controlled rectifier cannot be turned on; hence the ignition voltage is unaffected and the engine can be started. After the engine is started the clutch may be engaged and the interlock switch opened without killing the engine because the discharging circuit of the capacitor is altered so that the capacitor does not discharge sufficiently between pulses to take sufficient charging current to turn on the controlled rectifier.
摘要:
Disclosed herein is an outboard motor including a combination clutch and throttle control which is rotatably mounted on the tiller of a propulsion unit and which includes a first member connected to a rotatable throttle control member for common rotary movement so as to control the throttle of the outboard motor engine and a second member which has a common rotary movement with the first member and which is movable axially of the first member and which is connected through a push-pull member to a remote clutch control member to effect clutch actuation in response to axial movement of the second member relative to the first member. Accordingly coordinated steering, speed, and clutch control can be accomplished by an operator using one hand on the clutch and throttle control assembly.
摘要:
A throttle control device has a three-position diaphragm actuator controlled by induction vacuum through a solenoid valve to provide increased idle speed in high drive ratio or in reverse, a low idle speed and other drive ratios with a controlled throttle closing rate.
摘要:
A power transmission includes an engine-driven lock-up type torque converter for driving a speed changing gear shift mechanism shiftable to different speed ranges by solenoid operated clutch valves. An electronic controller provides output signals to operate the clutch valves and also to inhibit lock-up in certain speed ranges. The controller receives input signals from a manually operable multiposition speed range selection switch; from speed sensors on the torque converter and the gear shift mechanism; and from an engine throttle position control. The control effects automatic shifting to selected speed ranges and automatically shifts itself to maintain selected speeds; introduces a time delay in each transitional speed range to prevent hunting; effects downshifting, shifting to neutral and reversal only when correct speed ranges are reached; avoids shifting to neutral unless that position is actually selected; and performs other functions.
摘要:
A throttle control device has a diaphragm actuator controlled by induction vacuum through a solenoid valve to provide increased idle speed in high drive ratio or in reverse and to provide low idle speed in the lower drive ratio with throttle closing at a controlled rate.