Showing papers on "Spark-ignition engine published in 1980"

Surface ignition initiated combustion of alcohol in diesel engines--a new approach

Abstract: Since self-ignition temperature of alcohols is so high that abnormally high compression ratios would be required in conventional diesel engines, a novel approach is presented of force igniting methanol or ethanol alone in a diesel engine at normal compression ratios A heated and insulated surface was used to induce methanol pre-ignition as in a spark ignition engine A conventional single-cylinder diesel engine, modified to work on this principle, operates satisfactorily at the rated speed (1500 rpm) on methanol and ethanol with thermal efficiencies comparable to a normal diesel engine of the same configuration The engine also exhibits multi-fuel capability

Spark ignition engine

Abstract: PURPOSE:In a case where a spark mistake occurs by the adherence of fuel to an ignition plug, to prevent ignition error aftwerward by reducing the quantity of fuel to be supplied CONSTITUTION:When an ignition plug 32 becomes sooty and does not spark, a square signal from an AND circuit 46 is counted by a counter 47 The counter 47 operates a timer 48 in a state of continuous ignition error in which the counted value exceeds a predetermined value, and a display lamp 50 is ignited for predetermined time, a current being flowed to a relay coil 50 Accordingly, when a make contact 52 is closed, a starting switch 20 is short-circuited, and a cranking device 13 operates continuously and assumes an automatic cranking operation state Simultaneoulsy, by the connection of a relay coil 51 to a power source, a breaking contact 53 is opened, and the solenoid 11 is disconnected from the power source to close the electromagnetic valve and cut the supply of fuel to the bypass Consequently, adherence of fuel to the ignition plug electrode is prevented, and adhered fuel is dried

Thermodynamic analysis of turbulent combustion in a spark ignition engine. Experimental evidence

Abstract: A method independent of physical modeling assumptions is presented to analyze high speed flame photography and cylinder pressure measurements from a transparent piston spark ignition research engine. The method involves defining characteristic quantities of the phenomena of flame propagation and combustion, and estimating their values from the experimental information. Using only the pressure information, the mass fraction curves are examined. An empirical burning law is presented which simulates such curves. Statistical data for the characteristics delay and burning angles which show that cycle to cycle fractional variations are of the same order of magnitude for both angles are discussed. The enflamed and burnt mass fractions are compared as are the rates of entrainment and burning.

The development potential of spark ignition engines

Abstract: The dominant position of the spark ignition engine worldwide is due to the following characteristics: high brake mean effective pressure and high maximum speed (which result in high torque and high power-to-swept volume ratio); low weight and low bulk volume for a given power demand; smooth and low-noise operation; low cost per unit of power output; and possibility of operation with different fuels, including gasoline, liquified petroleum gas, alcohol, natural gas, liquified natural gas, and hydrogen The current diesel engine popularity is based on its greater fuel economy at part load Fuel efficiency of the spark ignition engine at part load can be improved by such measures as choosing operating areas with good efficiency; increasing the compression ratio (CR) and providing a knock-sensing control system; increasing the CR at part load by variable CR pistons; turbocharging; providing a low, stabilized idling speed, and cylinder cutoff at part load; reducing the power demand of auxiliary drives; and reducing engine weight Many of the proposed improvements can be realized only by increased use of electronic control systems Since these measures add to the complexity and cost of the engine, their introduction depends on the fuel cost savings returned to the consumer

Dual function concept stirling engine for automotive application

Abstract: The article examines the operating principles of the stirling engine and its application for automotive use. Present research is said to be generally concentrated on engines using diesel fuel. It is suggested that whereas diesel fuel is the most suitable fuel for the ci engine, and petrol for the spark ignition engine, the real automotive application for the stirling engine will come when diesel and petrol fuels are no longer available at low cost. At that point a thermal battery in combination with a stirling engine will be at an advantage. The thermal battery will be charged overnight by electric resistance heating, or by the combustion of natural gas or solid fuel. Such a propulsion system could be used with regenerative braking and applied to such vehicles as commuter transport and commercial delivery vehicles. (TRRL)

Performance of alternative automotive fuels

Abstract: In dealing with this topical, but controversial subject, it seems advisable to begin by specifying the fuels and prime movers to be dealt with. The alternative fuels that are available to us in New Zealand are the gaseous fuels methane, butane and propane, and the two alcohols, methanol and ethanol. In the long term, vehicles running on hydrogen may become available, and in emergencies the use of carbon monoxide from gas producers similar to those used during the war may be contemplated but the fuels listed are those most likely to be available in the near term. The two types of prime movers considered are the spark ignition engine and the compression ignition engine. Most of this paper will concern the spark ignition engine, but the idiosyncrasies of the compression ignition engine will be touched on briefly.

Spark ignition engine

Abstract: PURPOSE:To control the injection time and period of the fuel injector in an intake pipe and the engine output and reduce the fuel cost in a spark ignition engine with the subsidiary combustion room which communicates to the main combustion room. CONSTITUTION:The air from the air cleaner 31 passes through the main intake port and valve and flows into the main combustion room 22. It also passes through the subsidiary intake port and valve and flows into the subsidiary combustion room 32. The air volume taken in both combustion rooms 22 and 32 is constant independently of the treading-in of an accel pedal. When the intake valve opens, the output voltage pulses from the controller 54 change, are applied to the fuel injection valve 46, and adjust the fuel injection time and period, in accordance with the treading-in of the accel pedal and the rotational frequency of an engine. In the light load range where the treading-in of the accel pedal is small, fuel is injected at the later part of intake period and used effectively.