摘要:
A device for detecting engine knock is disclosed. The device comprises a bipolar vibration sensor secured to a spark ignition internal combustion engine and has first and second outputs for generating respectively signals representing individual ringing engine vibrations due to engine knock and signals representing the background engine vibrations due to engine operation, separately. A smoothing circuit is connected to the second output side of the vibration sensor for forming a means value of the background engine vibration signals. A comparator circuit has a first input terminal connected to the first output side of the vibration sensor and a second input terminal connected to the output side of the smoothing circuit for comparing the mean value of the outputs of the smoothing circuit with the peak value of the ringing engine vibration signals. A utilization circuit is connected to the output side of the comparator circuit for controlling the driving condition of the engine in an optimum manner. The bipolar vibration sensor comprises a first vibration section having a resonance frequency corresponding to the ringing vibration frequency due to engine knock and second vibration section having a resonance frequency different from the ringing vibration frequency.
摘要:
Disclosed is a spark ignition timing control system for a split type multi-cylinder internal combustion engine which operates to advance the spark advance angle of a specific combustion chamber relative to other combustion chambers. The control system generally comprises a means for detecting a knocking condition and generating knocking signal so as to retard spark advance angle corresponding to knocking of engine and a means for detecting engine load condition and thereafter advancing the spark advance angle of the specific combustion chamber when the engine is driven at relatively high loads.
摘要:
A knocking sensor having a thin vibrating plate (10) receiving sound produced from an engine. The vibrating plate is applied with a piezoelectric element (11) which delivers electric output in proportion to the vibration. The resonance frequency of the vibrating plate is made same as the knocking frequency. A resonant tube (20) for forming resonating cavity is attached in front of the vibrating plate. A sound collector (30) is provided in front of the vibrating plate. A duct (50) is arranged between the sound collector and the sensor to improve sensitivity and freedom of mounting of the sensor.
摘要:
A fuel injection nozzle for an internal combustion engine includes a hollow nozzle body and a valve member liftably disposed therein. The nozzle body and the valve member define a space therebetween through which fuel is supplied to an orifice in the nozzle body. The valve member contacts the nozzle body at a position to block communication between the space and the orifice when the valve member is in the unlifted position. Fuel enters the orifice from the space as the valve member lifts. The valve member and nozzle body have opposing surfaces establishing a gap between the space and orifice. The gap has a cross-sectional area smaller than that of the orifice that remains constant as the valve member lifts through a predetermined range so that the rate of fuel injection increases through a plateau as the valve member lifts to a position above the predetermined range.
摘要:
A fuel injection nozzle is provided with such an annular fuel passage that its fuel passage section is, at the earlier stage of fuel injection, maintained smaller than the whole sum of the sectional areas of injection orifices and adapted to increase gradually in response to the lift of a nozzle needle so that the rate of fuel injection increases gradually.
摘要:
A channel for recirculating a portion of an engine exhaust gas to the induction passage has an intermediately arranged converging-diverging supersonic nozzle with a valve member arranged in the nozzle to vary the cross-sectional area of the channel at the throat, so that the mass flow rate of the recirculated exhaust gas depends solely on the cross-sectional area so far as the gas velocity at the throat is sonic.
摘要:
In order to avoid the formation of smoke and HC when the compression ratio of a swirl chamber type Diesel engine is lowered either by design or by operation in rarified atmospheres, the fuel injector is located on one side of the center axis of the swirl chamber so as to maximize the distance for which the injected fuel can travel before contacting a wall of the chamber and the auxiliary transfer port through which a fraction of the injected fuel is fed to the main combution chamber is arranged so that the axis thereof intersects the axis of the fuel injector and therefore the trajectory along which fuel is injected, at a point defined within the swirl chamber per se and on the opposite side of the center axis with respect to the fuel injector.
摘要:
An engine system of the invention comprises an internal combustion engine; a carburetor; an exhaust gas recirculation system; an exhaust gas treatment device; and a source of secondary air, in which there is provided a fluid network which interconnects the source of secondary air, the engine exhaust system at a position upstream of the exhaust gas treatment device and the exhaust gas recirculation system at a position upstream of an exhaust gas recirculation valve and there is also provided an air injection control valve fluidly disposed in the fluid network intermediate the source of secondary air and the exhaust gas recirculation system. The air injection control valve is adapted to selectively permit and prevent the admission of air to the exhaust gas recirculation system. A controller for the air injection control valve is also disclosed which comprises a detector that generates as an output signal a first signal responsive to urban driving conditions which are empirically determined to occur when the motor vehicle is driven in urban areas and a second signal responsive to rural driving conditions which are empirically determined to occur when the motor vehicle is driven in rural areas. The controller causes the air injection valve to permit the admission of air to the EGR system when the detector detects the rural driving conditions.
摘要:
An ignition spark timing control system for an internal combustion engine capable of controlling the ignition spark advance angle corresponding to a knocking condition of the engine. The spark timing control system includes a means for retarding spark timing in response to an engine knocking condition and a means for detecting unstable driving condition of the engine and interrupting the retarding of the spark timing when the engine driving condition is unstable in order to maximize the engine output characteristics and improve fuel economy.
摘要:
An exhaust gas recirculation system comprises an exhaust gas flow control valve; a vacuum actuator for operation of the flow control valve; and a control apparatus for the vacuum actuator. The control apparatus comprises a vacuum regulator and a vacuum motor for actuating the vacuum regulator in response not only to the venturi vacuum but also to the intake manifold vacuum.