Abstract: A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir. A low liquid level alarm circuit is responsive to the bellows member to generate a signal indicative of a low liquid level state.

Abstract: A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir.

Abstract: A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir. A flow restrictor is positioned to dampen instantaneous differential column pressure changes presented to the bellows member while permitting steady state column pressure to be communicated to the bellows member.

Abstract: A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir.

Abstract: A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir. A flow restrictor is positioned to dampen instantaneous differential column pressure changes presented to the bellows member while permitting steady state column pressure to be communicated to the bellows member.

Abstract: A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir. A low liquid level alarm circuit is responsive to the bellows member to generate a signal indicative of a low liquid level state.

Abstract: A vehicle speed limiting system for a vehicle having an engine which includes a plurality of fuel injectors coupled to a low volume fuel injection pump operative to successively trigger a flow of fuel directly to the individual fuel injectors. The vehicle speed is converted to a speed signal which, when it reaches a preset limit, is utilized by the system control to close a fuel control valve through which fuel normally passes to the injection pump. The system is characterized by a low fuel residual upon cutoff by the fuel control so that the engine speed is quickly slowed for lack of fuel.

Abstract: A vehicle speed limiting system for a vehicle having an engine which includes a plurality of fuel injectors coupled to an inline, low volume fuel injection pump operative to successively trigger a flow of fuel directly to the individual fuel injectors. The vehicle speed is converted to a speed signal which, when it reaches a preset limit, is utilized by the system control to close a fuel control valve through which fuel normally passes to the injection pump, and also to simultaneously open a pressure regulator. The fuel control valve includes a small orifice to pass just enough fuel to prevent pump cavitation. The system is characterized by a low fuel residual upon cutoff by the fuel control valve so that the engine speed is quickly slowed for lack of fuel.

Abstract: A dual magnetic sensor utilizing a pair of separate coils to generate separate and isolated signals from a single pickup point, each signal having a power output at least equal to that of a conventional single coil sensor, the dual sensor having physical dimensions making it substitutable for a conventional single coil sensor.

Abstract: There is disclosed a speed control system for a diesel-powered vehicle in which a sensing element responsive to the speed of the vehicle or engine, preferably responsive to the vehicle speed, is connected through control means to close the fuel supply to the diesel engine, thereby permitting a preset limitation on vehicle and/or engine speed. The control system is designed as a retrofit to existing diesel engines and utilizes conventional elements such as the shut down lever of these engines, thereby avoiding any significant engine alterations or modifications.

Abstract: There is disclosed an automatic control system for limiting the operating temperature of a diesel engine having a pressurized intake manifold such as a turbocharged diesel engine. The system includes a pyrometer to sense the exhaust gas temperature from the engine and generate a signal therefrom, a temperature controller having an adjustable, maximum set point temperature to receive the signal from the pyrometer and to generate a control signal which is applied to a control valve in the manifold pressure line which applies manifold pressure to a pressure cell such as an aneroid unit that proportionally controls the position of the rack of the fuel supply. The control valve vents the manifold pressure line to the atmosphere and reduces the pressure on the aneroid unit to reposition the fuel rack in response to a sensed exhaust gas temperature which exceeds the preselected maximum set point temperature.

Abstract: There is disclosed an automatic control system for limiting the operating temperature of a diesel engine having a shut down lever that repositions the rack of its fuel pump to a shut down position that closes the pump metering valves and shuts off the fuel supply to the engine. The system includes a pyrometer to sense the exhaust gas temperature from the engine and generate a signal therefrom, a temperature controller having an adjustable, maximum set point temperature to receive the signal from the pyrometer and to generate a control signal which is applied to a control valve in a fluid pressure line which applies fluid pressure to a pressure responsive actuator that moves the shut down lever a fraction of its full travel necessary for shut down and thereby repositions the fuel pump rack to a throttling position in response to a sensed exhaust gas temperature which exceeds the preselected maximum set point temperature.

Abstract: An exhaust temperature monitoring unit is provided with a thermocouple connected in opposition to a reference signal across the differential inputs of an operational amplifier. Both the thermocouple and the reference signal are connected to a common ground which is isolated from the vehicle chassis. This provides a floating reference point which is insensitive to variations in ground potential and eddy current in the vehicle chassis. The operational amplifier drives an optical coupling unit which in turn controls various alarms and vehicle controls.

Abstract: An exhaust temperature monitoring unit including a thermocouple connected in summation with a regulated signal across the differential inputs of an operational amplifier to provide a temperature signal which is independent of the thermocouple ground. The operational amplifier drives a photocoupler at the output which in turn controls three functions. The first function provides an immediate audio alarm when a differential unbalance in the overheated direction is applied to the amplifier, the other two functions turning on a recorder and reducing fuel flow to the engine after a predetermined time delay.

Abstract: There is disclosed automatic means for limiting the operating temperature of an internal combustion engine that includes a pyrometer to sense the exhaust gas temperature from the engine and generate a signal therefrom, a temperature controller having an adjustable, maximum set point temperature to receive the signal from the pyrometer and to generate a control signal which is applied to a control valve in the fuel system to the engine or to electromechanical means to limit the supply of fuel or governor control in response to a sensed exhaust gas temperature which exceeds the preselected, maximum set point temperature. The invention can be particularly applied to a diesel engine by installing a flow control valve in the diesel engine fuel system operative to cycle the valve when the exhaust gas temperature exceeds the preselected maximum, set point temperature.