Apparatus for measuring compression pressures in internal-combustion engine
AssigneesToyota Jidosha Hanbai Kabushiki Kaisha, Kabushiki Kaisha Toyota Chuo Kenkyusho
InventorsTakayuki Kato, Satoshi Yamazaki
Life of this patent
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Abstract
An apparatus for detecting and indicating the pressure under which the air-fuel mixture is compressed in an internal-combustion engine for automobile vehicles, and more particularly an apparatus of the type which comprises probe means adapted to detect a compression pressure exerted during the compression stroke in the combustion chamber, and a plurality of electric circuits for processing signals from the probe means and indicating on display means the compression pressure as detected.
Claims20
An apparatus for measuring a pressure under which the air-fuel mixture is to be compressed during the compression stroke in the combustion chamber of an automobile internal-combustion engine, said apparatus comprising probe means including resistor means for detecting a secondary voltage signal consisting of a capacity discharge voltage signal, an induced discharge voltage signal and a free-oscillating discharge voltage signal from an ignition system, which probe means having one end connected to a secondary terminal of a secondary winding of an ignition coil and the other end connected to a rotor of a distributor which is connected to said secondary terminal of said secondary winding;
- a plurality of electric circuits connected to said probe means for selecting only said induced discharge voltage signal from said secondary voltage signal detected by said probe means, electrically processing said induced discharge voltage signal and indicating the value of said induced discharge voltage as the compressed pressure in the combustion chamber in a readable form.
An apparatus for measuring a pressure under which the air-fuel mixture is to be compressed during the compression stroke in the combustion chamber of an automobile internal-combustion engine, said apparatus comprising probe means having one end connected to a secondary terminal of a secondary winding of a secondary coil and the other end connected to a distributor rotor in an ignition system for detecting a secondary-voltage signal from said ignition system, and a plurality of electric circuits for selecting an induced discharge voltage signal from said secondary-voltage signal detected by said probe means, electrically processing said induced signal and indicating said induced signal in readable form, a frequency-to-voltage converter circuit adapted to convert a frequency of a primary-voltage signal from said ignition system into a voltage-level signal for supplying a d.c. voltage signal which is proportional to the number of revolutions of the engine, and an operational circuit actuated to compute an output of said frequency-to-voltage converter circuit and said voltage level of said induced discharge voltage included in said secondary voltage signal for supplying an output to represent a compression pressure exerted and detected at each top dead point of the piston.
Dependencies are inferred from the claim text.