Abstract: A speed control apparatus is proposed for motor vehicles driven by internal combustion engines and having a hydraulic connecting line between a first hydraulic adjusting cylinder, which is actuatable by the gas pedal, and a second hydraulic adjusting cylinder, which is connected with the throttle valve, the regulating rod of an injection pump in the case of Diesel engines, and the like for adjusting the operating status of the engine. A multiple-position valve is furthermore disposed in the hydraulic connecting line, this valve receiving control commands from an electronic control circuit. The electronic control circuit compares its input signals, provided by transducers, from the first and second hydraulic adjusting cylinders and reacts further such as to provide a supervisory intervention in further regulating control subsystems for the purpose of engine regulation.

Abstract: Feedback control is carried out to maintain the rotational speed of an internal combustion engine during idling at a desirable speed determined according to the operating conditions of the engine by controlling an adjusting valve for controlling the amount of air to be fed to the engine. The actual rotational speed of the engine and the actual opening angle of the throttle valve are detected and when the actual rotational speed is lower than a predetermined value and at the same time the actual opening angle of the throttle valve is smaller than a predetermined value, the feedback control is carried out. Further, whether or not the driving power of the engine is operatively transmitted to the driving wheels is detected, and the predetermined value for the rotational speed of the engine is set at a higher value when the driving power is not transmitted to the driving wheels than when the driving power is transmitted to the driving wheels.

Abstract: Regulation of idling speed involves the production of a first error signal by comparing engine speed with a reference idling speed, and then deriving from the first error signal in an amplifying PI controller, proportional and integral components that are added together, for use of the PI sum signal as a reference value signal for the displaceable stop position. The latter is compared to the actual stop position to provide a second error signal for control of electro-pneumatic valves of a positioning device that displaces the stop. Both the proportional and integral components produced in the controller vary assymetrically about the reference idling speed, so that regulation operates more strongly when the engine speed is too low than when it is too high, except for a dead zone on either side of the reference idling speed.

Abstract: Apparatus for controlling the idle speed of an internal combustion engine. A contact arm contacts a throttle lever to limit movement of the lever in one direction and to move the lever in the opposite direction so to control the position of a carburetor throttle valve. A vacuum operated unit maintains the contact arm at one position and moves it from one position to another. The vacuum pressure at which the vacuum unit operates is modulated by an electrically operated solenoid to maintain the contact arm in one position when the vacuum pressure is maintained at one level. The contact arm is moved to a new position when the solenoid operates to change the vacuum pressure to a different level.

Abstract: Apparatus for controlling the idle speed of an internal combustion engine. A contact arm contacts a throttle lever to limit movement of the lever in one direction and to move the lever in the opposite direction so to control the position of a carburetor throttle valve. A vacuum operated unit maintains the contact arm at one position and moves it from one position to another. The vacuum pressure at which the vacuum unit operates is controlled by an electrically operated variable position solenoid which controls flow of bleed air to the vacuum unit. When the solenoid is maintained at one position, the contact arm is maintained at a particular position by the vacuum unit. The contact arm is moved to a new position when a change in the solenoid position changes the vacuum pressure in the vacuum unit to a different level.

Abstract: Linkage is disclosed for adjusting the position of a diesel engine injection pump control rack in dependence on the position of the driver's accelerator pedal and also on a system for automatically maintaining the vehicle speed at a desired value. The injection pump rack is positioned by means of a pneumatic piston-cylinder assembly and connecting linkage. The pressure in the piston-cylinder assembly is adjusted by means of a driver-controlled valve in a supply line from a pressure source, and this valve is adjusted by the driver's accelerator pedal. A normally open valve is also connected in the pressure circuit and a normally closed exhaust valve is provided. When the automatic speed control system is in operation, the driver fully opens the driver-controlled valve (by fully depressing his foot pedal) and the automatic system adjusts the other valves to hold the speed at the desired value.

Abstract: A pneumatically operated speed governor (26) moves an engine throttle member (10) for controlling the speed of a vehicle. The governor includes a pneumatically operated actuator having an output connected to the engine throttle member. A pivotally mounted valve member (44) is positioned intermediate a vacuum supply orifice (46) and an atmospheric air orifice (48) and supplies a pneumatic signal to the actuator. An internal speed sensor (82) responsive to vehicle speed has an output member (100) which reacts against an improved, self-wiping minimum speed switch (102) and a set-speed control member (52) which in turn reacts against the pivotally mounted valve member (44) for varying the position of the valve member as the vehicle speed tends to fall below or rise above a predetermined set speed.

Abstract: A modulated vehicle cruise control system includes a source of vacuum, a servo transducer or control unit connected to the source of vacuum, an engine throttle position servo connected to the servo, a speed sensor and a logic circuit or command module. A modulator is disposed in series with and between the control unit and the source of vacuum. The modulator limits opening movement of the engine throttle by modulating communication of vacuum to the servo to prevent inefficient engine operation.

Abstract: A set switch 28 is connected via a first gate 34 to an analog switch 16, a speed incrementing circuit 36, and a latch circuit 30, but is connected directly to a second gate 22. When set switch 28 is actuated, a setting signal is passed through the first gate 34, unless the gate is closed by a signal from an upper-speed limit switch 38, thereby actuating analog switch 16 to pass vehicle speed signals from detector 10 to a storage device 18, and actuating latch circuit 30 to partially enable second gate 22. When set switch 28 is released, analog switch 16 closes, thereby storing the present vehicle speed signal in device 18 as a desired speed signal, and second gate 22 is fully enabled, thereby passing an actual speed/desired speed difference signal from comparator 20 to a speed controller 26.

Abstract: Controls are provided to directly or indirectly avoid operation of the internal combustion engine of a motor vehicle in a range of speed and output power which is detrimental to engine efficiency. The controls become operative upon attainment of a predetermined limit value for engine parameters.

Abstract: A motor vehicle with power take-off apparatus is equipped with an arrangement for automatically controlling the rate of supply of fuel to an internal combustion engine which drives the power take-off output shaft. This arrangement has a sensor which produces pulses at a repetition speed proportional to the speed of rotation of the power take-off output shaft, and circuitry which provides an output signal at one binary level if the sensed speed of rotation rises higher than a first reference speed on increasing from zero, and at the other binary level if the sensed speed of rotation falls below a second, lower reference speed on decreasing from above the first reference rate. This binary signal is used to control the state, energized or de-energized, of a solenoid which in turn controls, directly or indirectly, a mechanical device which acts on the flow of fuel to the engine. The road speed of the vehicle can be limited automatically in the same way.

Abstract: An idle control system for an automobile internal combustion engine includes an idle control unit for controlling the operation of an electromagnetically operated actuator. While the engine has a combustible mixture intake passage leading to the engine and a throttle valve operatively positioned inside the mixture intake passage for controlling the flow of a combustible air-fuel mixture towards the engine, the actuator is utilized to adjust either the effective cross sectional area of a bypass air passage leading from the air source to the mixture intake passage at a position downstream of the throttle valve or the opening of the throttle valve, to control the engine speed during idling to a predetermined value.

Abstract: Vehicle constant speed driving apparatus including a solenoid of a releasing valve for directing atmosphere into a hydraulic actuator when the releasing valve solenoid releases a constant speed driving which is in ON-condition (not causing ON-OFF repeated operation) in order to isolate an interior chamber of the hydraulic actuator from the atmosphere during the constant speed driving, and a modulator valve solenoid located adjacent to a releasing valve solenoid so that both solenoids are held in a substantially same thermal condition.

Abstract: Vacuum control apparatus for a vehicle having a speed control unit including a first vacuum line from the engine of the vehicle to the control unit and a second vacuum line from the control unit to a throttle servo of the engine, the vacuum control apparatus including vacuum measuring mechanism associated with the first vacuum line from the vehicle engine to the speed control unit, a supply of air to the second vacuum line from the speed control unit to the throttle servo, mechanism for selectively metering air into the second vacuum line, whereby sufficient air can be metered into the second vacuum line when the vacuum created by the engine decreases to prevent the speed control unit from opening the throttle excessively.

Abstract: A fluid actuator for electrically detecting the running speed of a vehicle and processing the detected data and an electric control system for driving said actuator are provided, and in the electric control system a delay involved in the response of the fluid actuator to a change of the running speed of the vehicle is compensated for in advance by a filter means to thereby automatically maintain a constant running speed of the vehicle.

Abstract: An idle speed control system for controlling the idle speed of an internal combustion engine, to conserve fuel by allowing a lowered idle speed, whenever possible, as well as offering more than normal power when needed, is disclosed. This idle speed control system includes an actuator for moving a secondary idle stop member into operative position, having both a vacuum-operated section and a solenoid section for maintaining the actuator in operative position, regardless of the state of the vacuum-operated portion. The idle speed control system further includes a control circuit responsive to engine speed which applies an output signal to the vacuum-operated section of the actuator when engine speed falls below a predetermined minimum, maintains it for a predetermined period of time, momentarily removes it to determine if the engine is presently capable of idling above the predetermined minimum speed, and reapplies the output signal if engine speed then dips below the predetermined minimum speed.

Abstract: A pneumatically operated speed governor (26) for moving an engine throttle member (10) for controlling the speed of a vehicle includes a pneumatically operated actuator having an output connected to the engine throttle member. A pivotally mounted valve member (44) is positioned intermediate a vacuum supply orifice (46) and an atmospheric air orifice (48) and supplies a pneumatic signal to the actuator. An inertial speed sensor (82) responsive to vehicle speed has an output member (100) which reacts against an improved, self-wiping minimum speed switch (102) and a set-speed control member (52) which in turn reacts against the pivotally mounted valve member (44) for varying the position of the valve member as the vehicle speed tends to fall below or rise above a predetermined set speed.

Abstract: A motor vehicle speed governor has safety features to assure that the throttle is released when the brake pedal is depressed even if malfunctions occur in certain components of the system. The speed governor has a servo for moving the throttle, an accelerator device for causing the servo to advance the throttle, a decelerator device for releasing the throttle, a control circuit for controlling the accelerator and decelerator devices in response to vehicle speed, and a power circuit that energizes the control circuit. The power circuit is connected into the brake electrical line. It includes a latching device that is powered through the ignition switch, but will latch and conduct only when energized by a set/on switch. The set/on switch requires power in the brake line across the brake fuse. The resume switch also requires power from the brake line across the brake fuse. A brake switch in the brake line is closed by depressing the brake pedal, sending a signal to the control circuit to release the throttle.

Abstract: A motor vehicle speed-control system includes a bellows chamber having a movable wall connected to the engine throttle. The pressure of the gas in the chamber is controlled by two electromagnetic valves, the first electromagnetic valve being energized with electrical pulses to repetitively connect the bellows chamber alternatively to atmosphere and vacuum, and the second electromagnetic valve being spring-biassed so that, when deenergized, it vents the chamber to atmosphere to ensure rapid closure of the throttle, and when energized, closes the said vent. An auxiliary fail-safe brake-pedal valve is provided. An audible signal is produced by a flow of air in the event of malfunctioning of the actuator device.

Abstract: A motor vehicle speed governor has features that make it advantageous for use with motor vehicles having flexible throttle cables. The speed governor has a vacuum responsive servo mounted in the passenger compartment for pulling on the rearward end of the throttle cable. A conduit extends from the vacuum servo to the engine manifold. The vacuum valve is connected into the conduit in the engine compartment for communicating the vacuum source with the servo. A vent valve is also mounted in the engine compartment in communication with the conduit for relieving the vacuum in the servo. Electronic controls are located in the passenger compartment for controlling the opening and closing of the vacuum and vent valves to govern the speed.

Abstract: An apparatus and method having a first unit for creating mechanical movement with a certain frequency ofmovement. A second unit is operatively associated with the first unit for producing a pulsing electrical signal that has a pulse rate substantially proportional to the frequency of movement. A third unit is operatively associated with the second unit for producing a pneumatic signal that is substantially proportional to the pulse rate of the pulsing electrical signal.

Abstract: A vehicle speed control system is disclosed where the vehicle speed is automatically controlled by an electro-pneumatic actuator subjected to the controlled application of sub-atmospheric pressure. A dump valve is normally held closed by an energized electrical coil but opens when the coil is de-energized and connects the actuator to atmosphere and shuts off the control system. The coil is connected to an electrical power source through a disabling switch which is intended to be opened automatically when the driver operates the vehicle brakes and thus overrides the control system. To ensure that the override is effective even if the disabling switch fails to open, a brake-pedal operated switch connects one end of the coil to the same terminal of the power supply as is connected to the other end of the coil by the disabling switch. Therefore, when the brakes are operated both sides of the coil receive the same potential and the coil is de-energized even if the disabling switch fails to open.

Abstract: Apparatus for controlling the rotational speed of an I.C. engine in an idling operation comprises a constant pressure valve, a solenoid valve, and a control signal generator. A constant vacuum pressure produced by the constant pressure valve is modified by atmospheric pressure by means of the solenoid valve which is actuated by a pulsating signal produced in the control signal generator. The pulse width of the pulsating signal is variable in accordance with a detected engine speed. The modified vacuum pressure is coupled to a chamber of a main valve of a conventional boost controlled deceleration device to control the amount of air-fuel mixture supplied to the intake manifold of the engine.

Abstract: The amount of secondary air flowing through a bypass air passage bypassing the throttle valve of an engine, which is connected to an automatic transmission of a vehicle having an air-conditioner, is controlled by an air control valve disposed in the bypass air passage. The air control valve is controlled on the basis of the result of comparison between a signal indicative of the actual idling rotation speed of the engine detected by the distributor of the engine and a reference signal indicative of a desired idling rotation speed of the engine. The level of this reference signal indicative of the desired idling rotation speed of the engine varies depending on the on-off of the air-conditioner in the vehicle or on the position of the shift lever of the automatic transmission.

Abstract: An automatic speed control for a vehicle having a source of compressed air, such as a heavy duty truck, includes a logic controller which controls a pair of solenoid valves to regulate communication between the compressed air source and an air actuated throttle. The controller is responsive to initiation of speed control by actuation of the appropriate switch by the vehicle operator to use inputs representing wheel speed (or engine speed) and the position of the vehicle throttle to generate an error signal. The controller compares the error signal with a signal representing a desired or memorized speed set by the vehicle operator and controls the air actuated throttle accordingly.

Abstract: A governor system for an engine motive fluid induction system is shown as having a solenoid operated valve assembly communicating with a source of vacuum and with a vacuum motor assembly operatively connected to a variably positionable throttle valve of the induction system; an electronic control sensitive to the speed of a monitored parameter is effective to controllably energize the solenoid valve assembly to in turn regulate the magnitude of vacuum directed thereby to the vacuum motor assembly and consequently govern the then permissible amount of opening of the throttle valve.

Abstract: A vacuum operated servo comprises a vacuum chamber defined by a flexible diaphragm and a cover, a valve seat secured to the cover so as to project into the vacuum chamber, a valve body yieldably mounted on the flexible diaphragm, a first vacuum conduit with a first valve for inducing vacuum from a vacuum source into the vacuum chamber through the valve seat, a second vacuum conduit with a second valve for inducing vacuum from the vacuum source into the vacuum chamber, and a leak orifice for leaking the vacuum in the vacuum chamber. When the first valve is opened to induce vacuum of the vacuum source into the vacuum chamber, by the vacuum, the diaphragm is moved so that the valve body contacts with the valve seat. Upon the contact, the induction of the vacuum is interrupted to stop the movement of the diaphragm, with the vacuum being introduced and leaked out of the vacuum chamber.

Abstract: A speed limiter for the regulation of the speed of an internal combustion engine wherein in addition to a first kinematic linkage chain between a manually operable acceleration pedal and an engine throttle is provided a second computer controlled kinematic linkage chain which can assume speed regulation control in such a way that the second chain can take over from the first when the first has maximally opened the throttle and without the first chain hindering the functioning of the second under the command of the computer as soon as the vehicle has entered the prescribed range of regulation. In one embodiment the second kinematic chain includes a pneumatic actuator coupled to the throttle and operable by means of the opening electrovalves as controlled by the computer in accordance with vehicle speed and acceleration. In another embodiment, the second kinematic linkage chain includes a reversible motor having a shaft rotatable under the control of the system computer.

Abstract: The invention relates to an actuator device for a motor vehicle speed-responsive system, the device being operable to actuate the throttle valve or the like of the internal combustion engine of the vehicle. The actuator device comprises a bellows device defining a first chamber partly bounded by a movable wall and a fixed wall, and communicating with two further chambers defined by associated housings carried by the said fixed wall. One of the further chambers contains a first electro-magnetic control valve fed by a D.C. voltage, and operable to control an orifice through which the first chamber communicates with atmosphere. The other of the further chambers contains a second electro-magnetic control valve fed both by said D.C. voltage and by a pulsed voltage, and operable to control both an orifice through which the first chamber communicates with atmosphere and an orifice through which the first chamber communicates with a source of gas at sub-atmospheric pressure.