Abstract: A supercharging pressure control device for an exhaust gas turbocharger comprises a bypass valve control device which effectively controls the supercharging pressure to correspond to the load on an internal combustion engine when the supercharging pressure downstream from a compressor is higher than a first set value. Further, a velocity control device for exhaust gas flow is positioned between the inlet port of the bypass valve control device and the exhaust gas turbine to control the exhaust gas flow velocity when the supercharging pressure downstream from the compressor exceeds a second set value which is lower than the first set value. A pressure sensor is installed in the downstream side of the compressor in the intake air channel to detect the supercharging pressure. A controller comprising a microcomputer is also provided. Several types of detection means output operating status signals to the controller. A fuel supply means comprising an injection valve is provided.

Abstract: In a turbocharger control system which includes fault testing circuitry which automatically senses and compares engine operating parameters of manifold pressure, exhaust temperature, engine speed, and actuator position, compares the sensed values to predetermined norms to establish the validity of the signals, in which substitutes preestablished values for the sensed signals when the sensed signal is determined to be invalid. The substituted value may be a value stored in the memory of a microprocessor used in the system or a value derived from a signal received from a different but corresponding sensor of the engine being controlled.

Abstract: An electronic control (10) for generating control, diagnostic, and fault signals for a diesel engine (12) with a turbocharger (22) and an injection pump (14). The control (10) provides an injection pump control (78), a turbocharger control (80), a fault monitor (82) and a sequencing control (84). These controllers are embodied as a stored program of a microprocessor controlled processor, timing, and memory module (228). The module (228) communicates with an input section receiving analog and discrete inputs via a serial input data line (CRUIN) and further communicates with an output section generating analog and discrete outputs via a serial output data line (CRUOUT).

Abstract: A method for supercharging internal combustion engines with turbochargers wherein the engine is operated in the lowest load region as a naturally aspirated engine, and the waste gate, the inlet section of the turbine and all other exhaust gas ducts present are fully open. When this load range is exceeded, the flow area of the turbine inlet is reduced to its minimum operational value and subsequently, with a further increase in load, is increased again to its maximum value at full load. The engine operated according to this method has a varioturbocharger whose turbine inlet flow area is controlled by a throttle slide as a function of the fuel injection quantity and the boost pressure by means of an adjustment device and a control pressure modulator.

Abstract: A control system for a compressor unit driven by a clean-burn, turbo-charged, gas-fueled engine which is primarily responsive to the load (torque) and the speed of the engine to adjust certain engine parameters to maintain the operating conditions of the engine within a desirable operating zone which is a compromise or "trade-off" between best fuel economy and permissible exhaust emission levels. A number of "maps" which correlate load (torque) at various speeds with specific fuel consumption and exhaust emissions are derived from available manufacturer's data and are programmed into a central processing unit (CPU).

Abstract: A system for controlling an exhaust gas-driven supercharger used in an internal combustion engine for an automotive vehicle includes an exhaust gas bypass passage connecting between selected portions of the exhaust gas conduit upstream and downstream of a turbine of the supercharger, and an exhaust bypass valve disposed midway of the exhaust gas bypass passage for controlling the quantity of engine exhaust gases. In the supercharger control system, an actuator responsive to a digital control signal is employed for actuating the exhaust bypass valve. A microcomputer calculates the opening of the exhaust bypass valve so that the supercharged air pressure may not exceed the critical point giving rise to knocking, and such a digital control output signal is applied to energize the actuator so that the supercharged air pressure can be controlled with highest efficiency over a wide operation range of the engine.

Abstract: An internal combustion engine is equipped with a supercharger which includes an intake port, an intake passage communicated with the intake port and a compressor interposed in the intake passage and compressing the intake air flowing through the intake passage. A unidirectional valve such as a reed valve is disposed inside the intake passage in series with the compressor in order to prevent backflow of the supercharged air inside the intake passage and thus to prevent a drop in the engine output when a throttle valve inside the intake passage is abruptly closed.

Abstract: An air pressure regulating arrangement for regulating charging air pressure of an internal combustion engine which is provided with an exhaust gas turbo-charger including a charging blower and an exhaust turbine. A pressure regulating device responding to charging pressure of a charging blower operates a control device arranged in an exhaust channel by passing the exhaust turbine with the charging air pressure between the charging blower and a load regulating member of the internal combustion engine being monitored so that, upon exceeding a predetermined charging air pressure, the fuel supply to the internal combustion engine is interrupted until such time as the charging air pressure is decreased to the predetermined air pressure whereupon the fuel supply to the engine is then restored.