摘要:
In a sparkplug voltage detecting probe device for use in internal combustion engine, a sensor is provided to form a static capacity between the sensor and an ignition coil which Is connected to a spark plug. A sparkplug voltage divider circuit has a capacitor connected between the sensor and the ground. A release circuit has a resistor connected in parallel with the capacitor so as to provide a time constant of a RC path. A short circuit is provided to instantaneously release an electrical charge from the capacitor either immediately before establishing a spark voltage for the spark plug or immediately after initiating the spark action of the spark plug. A sparkplug voltage waveform detecting circuit detects a sparkplug voltage waveform divided by the sparkplug voltage divider circuit, e.g. to detect misfire.
摘要:
A device for detecting the mix ratio of a composite liquid (6) has a transparent column (2) placed so that the bottom (22) of the column (2) is in contact with the liquid and a light emitting diode (3) disposed so that light therefrom is incident on one side of the column to pass therethrough so as to be incident on the interface (22a) between the bottom of the column and the mixing liquid. Light incident on the interface at less than the critical angle are refracted, while light is incident on the interface at more than the critical angle is totally reflected to escape from the other side of the column. A photodiode (4) is provided to receive the light beams escaping from the other side of the column and to generate an output. The effective photo-receiving area (41) of the photodiode is in the form of an inverted trapezoid to make the output from the photodiode more linearly dependent on the mix ratio.
摘要:
A detector device for mixing ratio of petrol and alcohol or the like comprising; an optically permeable column (3), one end of which has a specular layer (La), and projects to be immersed the outer surface with a mixing liquid of different kinds of components; a light emitting diode (5) placed to face the other end of the optically permeable column so that the light beams therefrom are incident on a boundary (Bo) between the optically permeable column and the mixing liquid, the light beams incident on the boundary at less than a critical angle being totally refracted, while the light beams incident on the boundary at more than a critical angle being totally reflected, the critical angle depending on a mixing degree of the mixing liquid; a photo diode (6) placed on the base plate in coplanar relationship with the light emitting diode so as to receive the light beams reflected at the boundary, or at the specular layer to go back through the column to fall thereon so as to generate an output in accordance with the light intensity received; and the column determining its lengthwise dimension and a radial dimension measured from a point of the light emitting diode to be such as to only include light beams extending from the one which is incident on the boundary at a critical angle to totally reflect only once and reflect back at the specular layer so as to directly fall on the photo diode when one component of the mixing liquid is one specified value, to other light beams which is incident on the boundary at a critical angle to totally reflect only once and reflect back at the specular layer so as to directly fall on the photo diode when the one component of the mixing liquid is other specified value.
摘要:
An ion current detection apparatus which can detect ion current with a high degree of accuracy regardless of the presence of voltage damped oscillation and which does not cause contamination of a spark plug. A spark discharge current Isp generated upon spark discharge of a spark plug 10 flows through a charge diode 28, a capacitor 24, and a diode 22, which form a closed loop together with the spark plug 10 and a secondary winding L2 of an ignition coil 12 that constitutes an ignition apparatus 2. As a result, a Zener diode 26 connected in parallel to these components generates a Zener voltage Vz and thereby charges the capacitor 24. When a preset wait time has elapsed after the ignition timing for starting spark discharge, the discharge switch 30 short-circuits the opposite ends of the charge diode 28 to discharge the capacitor 24, so that a high voltage having a polarity opposite that in the case of spark discharge is applied to the spark plug. An ion current Iio flowing at this time is detected by use of a resistor 22 connected in parallel to the diode 22.
摘要:
In a misfire detector device for use in internal combustion engine, an electrical interrupter circuit on-off actuates a primary current flowing through a primary circuit of an ignition coil to induce a sparkplug voltage. A check diode is provided in a secondary circuit of the ignition coil to prevent a current flowing back to the ignition coil. The spark plug has a center electrode, a front end of which is projected from an insulator, and an outer surface area of the projected front end being 25 mm² or more. A sparkplug voltage detector circuit detects an attenuation time length of a sparkplug voltage waveform presented subsequent to a time period predetermined after an end of a spark action of the spark plug. On the basis of the attenuation time length, a distinction circuit determines whether a misfire occurs in a cylinder of an internal combustion engine.
摘要:
In a sparkplug voltage detecting probe device for use in internal combustion engine, a sensor is provided to form a static capacity between the sensor and an ignition coil which Is connected to a spark plug. A sparkplug voltage divider circuit has a capacitor connected between the sensor and the ground. A release circuit has a resistor connected in parallel with the capacitor so as to provide a time constant of a RC path. A short circuit is provided to instantaneously release an electrical charge from the capacitor either immediately before establishing a spark voltage for the spark plug or immediately after initiating the spark action of the spark plug. A sparkplug voltage waveform detecting circuit detects a sparkplug voltage waveform divided by the sparkplug voltage divider circuit, e.g. to detect misfire.
摘要:
In a misfire detector device for use in internal combustion engine, an electrical interrupter circuit on-off actuates a primary current flowing through a primary circuit of an ignition coil to induce a sparkplug voltage which is applied to a multi-electrode type spark plug. A check diode or a series gap is provided in a secondary circuit of the ignition coil to prevent a current flowing back to the ignition coil. A sparkplug voltage detector circuit detects an attenuation time length of a sparkplug voltage waveform presented subsequent to a time period predetermined after an end of a spark action of the spark plug. On the basis of the attenuation time length, a distinction circuit determines whether a misfire occurs in a cylinder of an internal combustion engine.