A stator includes a stator core, which has a plurality of stacked electromagnetic steel sheets, caulking portions configured to fix the plurality of electromagnetic steel sheets to each other, and a plurality of slot portions open toward an inner circumference side and arrayed along a circumferential direction. A number Q (an integer of 1 or greater) of the caulking portions, a number S of the slot portions and a number P of the poles satisfy Q≦S and Q=P×n/2 (where n is an integer of 1 or greater). The stator is preferably part of a motor for a compressor.

Stator, motor, and compressor

A control device for cylinder injection and spark ignition type internal combustion engines that is provided for switching fuel injection modes of the engine without causing misfire and smoke, deteriorating the exhaust emissions and fuel economy characteristics and generating switching shocks. An electronic control unit (70) of the control device sets either a first half period injection mode in which fuel is injected during an intake stroke or a second half period injection mode in which fuel is injected during a compression stroke in accordance with the operating conditions of the engine and also sets values of parameters related to the combusting condition of the engine such as fuel injection amount, ignition timing and exhaust gas re-circulating amount to the those that meet the set injection mode so that the operation of the engine is controlled. When an injection mode switching is required due to a charge in the engine operating condition, parameters are switched from those meeting an injection mode before the switching to those that meet an injection mode after the switching at a suitable timing.

Control device for cylinder injection and spark ignition type internal combustsion engines

A method for operation of a direct-injection spark-ignition internal combustion engine operated over large areas of the characteristics map with stratified charge by way of fuel injection during the compression stroke In order to guarantee reliable mixture ignition and combustion, the method of the present invention provides an ignition system which generates alternating voltage so that high voltage rapidly builds up between the electrodes of a spark plug, and generates ignition sparks with a spark duration that can be defined as a function of operating point

Method for operation of a direct-injection spark-ignition internal combustion engine

In an ignition controller for an internal combustion engine, an angle sensor includes a plurality of sensor means for individually outputting a pulse signal SGT1 corresponding to a first reference crank angle and a pulse signal SGT2 corresponding to a second reference crank angle and a control/arithmetic operation circuit includes a timing calculation means for calculating the timings at which ignition coils are controlled according to an operating state, count means for counting the number of the pulses of one of respective pulse signals which are detected between two continuous pulses of the other of them, reverse rotation discriminating means for discriminating the reverse rotation of the internal combustion engine based on the count values CA1 and CA2 of the respective pulse signals and control prohibition means for prohibiting the output of drive signals P1 and P2 in response to a reverse rotation discriminating signal to thereby prohibit ignition control in the occurrence of the reverse rotation by discriminating the reverse rotation from the pulse counting state of respective reference crank angles having a different phase each other. With this arrangement, there is provided the ignition controller for the internal combustion engine capable of avoiding erroneous control caused by the reverse rotation.

Ignition controller for internal combustion engine

A method of operating a two-stroke, spark-ignited internal combustion engine equipped with an ECU (66), an Input/Logic Multiplexer (70), a DC - DC converter (74), an Ignition Trigger (78) and an Ignition Distribution System (86) wherein the ignition is time-base controlled at higher speeds.

Method of operating a fuel injected engine

The present invention relates to ignition systems for internal combustion engines and, in particular, to a spark ignition system specifically adapted for two-cycle engines. An ignition system is provided which is able to avoid ignition plug smolder and electrode contamination by providing for self-cleaning of the ignition plug electrodes and ensuring complete combustion of an injected rich mixture of fuel/air in the vicinity of the ignition plug electrodes within a combustion chamber. This is accomplished by employing two distinct, yet interrelated, ignition plug firing systems. One such system causes an ignition plug to emit a spark of long duration when an air/fuel charge is present in the combustion chamber, thereby ensuring good combustion. The other system causes the ignition plug to emit a spark of short duration and of very high energy when little, or no, charge is present in the combustion chamber, thereby aiding in the self-cleaning of the electrodes of the ignition plug.

Ignition system for a two cycle engine

PURPOSE:To improve self-cleaning work of spark plug, and prevent smoking and wetting damage of the spark plug, and ignite the dense air-fuel mixture securely for combustion by providing a current break type ignition means and a capacity discharge type ignition means CONSTITUTION:A spark plug 50 is connected to an ignition device 52 electrically This ignition device 52 consists of a current break type ignition means 53 and a capacity discharge type ignition means 54 At this stage, electric spark is thrown from the ignition means 53 to the spark plug 50 at a point near a compression top dead center to ignite the air-fuel mixture for combustion When a piton is pushed down by the combustion explosion of the air-fuel mixture and an exhaust port starts to be opened, the electric spark is thrown from the ignition means 54 to the spark plug 50 Consequently, carbon adhered to an electrode of the spark plug 50 can be burned off for elimination Besides, since the spark connection time of the ignition means 53 is long, chance of igniting the air-fuel mixture is increased

Akira Yamada

Papers

Ignition system for a two cycle engine

Ignition device for two-cycle engine