RU2459968C1 - Power control method of internal combustion engine - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: power control method of internal combustion engine consists in the fact that the quantity of air supplied to combustion chambers is not restricted, and power is controlled by interrupting the fuel supply. Time interval during which the engine shaft rotates to the angle equal to

radians is measured, where N- number of cycles in working engine cycle, K - number of combustion chambers in the engine. Measurement result of electronic device is compared to the specified value, and when the measured interval exceeds the specified value, fuel is supplied. When the measured time interval is reduced below the specified value, fuel feed is stopped, and power control is performed by changing the specified value of the above time interval.

EFFECT: improving control accuracy and performing cycle-by-cycle control of fuel feed.

Description

The invention relates to engine building, and more particularly to internal combustion engines (ICE), mainly to automotive engines with electric fuel supply control.

A known method of controlling the power of a gasoline ICE by changing the amount of air supplied to the engine cylinders using a throttle valve [1]. In the known method, the amount of air consumed is measured and, depending on the result of the measurement of this and a number of other parameters, the fuel supply is controlled. The implementation of the known method requires the use of a mass air flow sensor, which, in addition to complicating the control system, introduces an inherent error in the regulation process [2]. This error is so great that in modern cars, a feedback system for the composition of the exhaust gases is introduced into the fuel management process.

A known method of regulating the power of an internal combustion engine [3], which consists in the fact that the amount of air supplied to the cylinders is not limited, while the rotation period of the crankshaft is measured, in an electronic device it is compared with a predetermined value and, with an increase in the period above the set value, produce fuel. If the crankshaft rotation period is lower than the set value, the fuel supply is stopped. The amount of fuel supplied is determined by known methods based on the conditions of constant volume of supplied air, which in the proposed method is equal to the working volume of the cylinder and is known with high accuracy.

However, for example, in a four-cylinder four-stroke engine, two acts of fuel injection into the corresponding engine cylinders occur in one revolution of the crankshaft. Moreover, if the required value of the period of revolution of the crankshaft will be achieved as a result of combustion of the first fuel charge, then the second fuel charge will be excessive and adversely affect the accuracy of regulation. In an eight-cylinder four-stroke engine, the number of such excess charges can reach 3.

The technical result of the claimed invention is to improve the accuracy of regulation and the implementation of loop control of the fuel supply.

радиан, где N - число тактов в рабочем цикле двигателя, К - количество камер сгорания в двигателе, результат измерения в электронном устройстве сравнивают с заданным значением и при превышении измеренным интервалом заданного значения производят подачу топлива, при уменьшении измеренного интервала времени ниже заданного значения подачу топлива прекращают, а управление мощностью производят изменением задаваемого значения указанного интервала времени.Moreover, according to the invention, a time interval is measured for which the motor shaft is rotated by an angle equal to

radian, where N is the number of ticks in the engine’s duty cycle, K is the number of combustion chambers in the engine, the measurement result in the electronic device is compared with the set value and when the measured interval is exceeded the set value, fuel is supplied, while the measured time interval decreases below the set value, the fuel is supplied stop, and power control is produced by changing the set value of the specified time interval.

The essence of the proposed method lies in the fact that they measure not the full period of rotation of the shaft, but the time interval during which the motor shaft rotates through an angle φ equal to

радиан,

radian,

Where

N is the number of ticks in the duty cycle;

K is the number of combustion chambers in the engine.

Thus, for a four-stroke four-cylinder engine, the measured time interval is equal to the time the crankshaft rotates by π radians. For a six-cylinder four-stroke engine, we have

etc.

The change in the rotation speed of the motor shaft is made by changing the set value of the specified time interval and this regulates the power of the internal combustion engine.

The proposed method allows to increase the accuracy of regulation and to implement loop-by-loop control of fuel supply in the strict sense of this concept.

Literature

1. UDK621.43.1075 “Internal combustion engines. Piston and Combined Engine Systems Ed. A.S. Orlin and M.G. Krugov. Moscow. "Mechanical Engineering", 1985, pp. 112-115.

2. UDC.629.113.5.014 A.K. Giriavets. "Theory of automobile gasoline engine control." Moscow, Stroyizdat, 1997, pp. 60-63.

3. F02D 17/02 “Method for regulating the power of an internal combustion engine”. RF patent 2345235, published January 27, 2009, Bull. Number 3.

Claims (1)

A method for controlling the power of an internal combustion engine, in which the amount of air supplied to the combustion chambers is not limited, and the power is controlled by interrupting the fuel supply, characterized in that a time interval is measured for which the engine shaft is rotated by an angle equal to

radian, where N is the number of ticks in the engine’s duty cycle, K is the number of combustion chambers in the engine, the measurement result in the electronic device is compared with the set value and when the measured interval is exceeded the set value, fuel is supplied, while the measured time interval decreases below the set value, the fuel is supplied stop, and power control is produced by changing the set value of the specified time interval.