RU1798530C

RU1798530C - Method of ignition timing for internal combustion engines

Info

Publication number: RU1798530C
Application number: SU904872206A
Authority: RU
Inventors: Юрий Петрович Кузнецов; Владимир Петрович Лебедев
Original assignee: Физико-Энергетический Институт Ан Латвсср
Priority date: 1990-10-10
Filing date: 1990-10-10
Publication date: 1993-02-28

Abstract

Использование: в системах зажигани ДВС с произвольным числом цилиндров и работающих на топливах с различными октановыми числами. Сущность изобретени : формируют два временных интервала между соседними ВМТ, в первый измер ют скорость вращени коленчатого вала ДВС, во второй формируют требуемое опережение зажигани . Особенностью изобретени вл етс то, что начало первого и конец второго временных интервалов устанавливают равными времени сгорани топлива, а конец первого и начало второго временных интервалов устанавливают совпадающим с временем, равным повороту коленчатого вала ДВС на половину углового рассто ни между ВМТ, что позвол ет повысить точность .Usage: in the ignition systems of internal combustion engines with an arbitrary number of cylinders and operating on fuels with different octane numbers. SUMMARY OF THE INVENTION: two time intervals are formed between adjacent TDCs, the first measures the speed of rotation of the ICE crankshaft, and the second forms the required ignition timing. A feature of the invention is that the beginning of the first and the end of the second time intervals are set equal to the fuel combustion time, and the end of the first and the beginning of the second time intervals are set to coincide with the time equal to the rotation of the ICE crankshaft by half the angular distance between TDC, which allows to increase accuracy.

Description

Изобретение относитс к системам зажигани в ДВС, а более конкретно к способам формировани опережени электроискрового зажигани ,и может быть использовано дл ДВС с произвольным числом цилиндров и работающих на топливах с различными октановыми числами.The invention relates to ignition systems in an internal combustion engine, and more particularly, to methods for generating an advance of electric spark ignition, and can be used for internal combustion engines with an arbitrary number of cylinders and operating on fuels with different octane numbers.

Цель изобретени - повышение точности формировани опережени за счет того, что его осуществл ют не по переменному параметру - углу опережени , а по времени опережени , физическим смыслом которого вл етс врем сгорани топлива в цилиндре - величина практически посто нна дл заданного состава топлива.The purpose of the invention is to increase the accuracy of advancing formation due to the fact that it is not carried out according to a variable parameter - the advancing angle, but according to the advancing time, the physical meaning of which is the time of fuel combustion in the cylinder - the value is practically constant for a given fuel composition.

Способ реализуетс с помощью известных технических средств следующим образом . При вращении коленчатого вала ДВС фиксируют два временных интервала с помощью датчика положени коленчатого вала , отмечающего прохождение половины пути от первой до второй ВМТ, выполненного , например, на основе стандартного фотодатчика , начало первого временногоThe method is implemented using known technical means as follows. When rotating the crankshaft of the internal combustion engine, two time intervals are recorded using the crankshaft position sensor, which marks the passage of half the path from the first to the second TDC, made, for example, on the basis of a standard photosensor, the beginning of the first time

Claims

the interval is set using a standard standby multivibrator, generating a signal with a duration equal to the time of fuel combustion in the cylinder. The end of the first time interval is fixed using a position sensor at the moment the crankshaft passes through half the angular distance between adjacent TDCs. The duration of the first time interval, which depends on the speed of rotation of the crankshaft, is fixed by a standard pulse counter. The beginning of the second time interval coincides with the moment when the crankshaft passes through half the angular distance between adjacent TDCs, and the duration of the second time interval using the pulse counter is set equal to the first time interval. At the same time, the end of the second time interval is the beginning of the lead time. Claims A method for generating an ignition lead in an internal combustion engine, wherein

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rotate the ICE crankshaft and record two time intervals between adjacent first and second TDCs of the ICE crankshaft, in the first of which the angular velocity of the ICE crankshaft is measured. and in the second, the required ignition advance is formed according to the measurement results, which are different. that, in order to increase the accuracy of the advance formation, the beginning of the first and the end of the second

th time intervals are set equal to the time of fuel combustion in the cylinder, which is delayed and ahead of the first and second TDCs of the ICE crankshaft, respectively, and the end of the first and the beginning of the second time intervals are set to coincide with the time; equal to the rotation of the ICE crankshaft by half the angular distance between the first and second TDCs of the ICE crankshaft.