JPS62503182A - How to operate an internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] How to operate an internal combustion engine The present invention relates to a method of operating an internal combustion engine, in particular a method comprising at least one gas exchange valve. , the gas exchange valve is held in the open position by energizing the coil of the first electromagnet. the gas exchange valve is placed in the closed position by energizing the coil of the second electromagnet. the gas exchange valve by being held and the current in the coil of the first electromagnet being interrupted. is moved from the open position to the closed position under the force of the spring, and the coil of the second electromagnet When the current is interrupted, the spring force moves from the closed position to the open position. The present invention relates to a method of operating an internal combustion engine configured to be moved.

An internal combustion engine of this kind is known from German Patent Application No. 30 24 109. child In order to improve and optimize the performance of internal combustion engines of this type, the opening and closing points of gas exchange valves must be The chaining point must be set and maintained as accurately as possible.

The object of the invention is to propose a method for operating this type of internal combustion engine with the highest possible efficiency. It is about providing.

To achieve this objective, the present invention provides a method for controlling the point in time when the current in the electromagnetic coil is cut off. The control is performed by a computer, and the computer determines when to shut off until the shutdown is performed. Calculated based on crank angle information, and continues at least during the current cutoff period. While the gas exchange valve is moving, the computer performs control based on time information. Ru.

In the well-known calculation of ignition timing, starting from the components that rotate in synchronization with the crankshaft. The resulting signal is used to create a reference pulse to operate this calculation circuit. Ru. This makes it possible to change the phase of the crankshaft or crank angle at any given time. A click to establish the time is required because information about the The rotation speed information of the rank axis can be made unnecessary. Of course, the number of revolutions is It is possible to enter the calculation process as a parameter.

This type of crank angle-based system has excellent accuracy; It is superior to a time-controlled ignition system of simpler construction.

This time-based ignition system is controlled based on time and speed. Calculate the phase of the crankshaft from time to time.

In this type of internal combustion engine, a system that is controlled based on crank angle is Even if it is used to control replacement valves, it is still a system that is controlled based on crank angle. The accuracy of the gas exchange valve is essential in order to maintain constant opening and closing timing. It has become clear that sushi cannot be used as is. This is a gas The time required for a switching valve to move from the closed position to the open position due to a rubber spring, for example. is a value specific to the mechanical system of the replacement valve and is independent of the angular velocity of the crankshaft. This is because it is caused by.

In order to solve these problems, the present invention aims to solve the following problems: At times, the system for setting the opening and closing times of gas exchange valves is It switches from a system based on rank angles to a system based on time. be.

In a preferred embodiment of the invention, the computer performs the control based on time. Evaluate crank angle information to simultaneously calculate the change in rotation speed over time It is possible that

A method of operating an internal combustion engine according to the present invention will be described below with reference to the drawings.

The drawing shows the temporal flow of the current through the coil, especially when the gas exchange valve changes position. It is a graph showing progress.

As long as the gas exchange valve remains in its rest position, ie open or closed position, the gas Since the armature of the switch valve is located near the current-carrying coil, the current flows through this coil. exerts a holding force on the armature of the gas exchange valve through. When the current is cut off from the coil , this holding force is reduced. A spring force acts on the gas exchange valve, and this spring force Accelerate the exchange valve to the other rest position. German Patent Application Publication No. 3024109 As stated in the issue, the center position of this spring system is located between the two rest positions. The spring system biases the gas exchange valve from one rest position to approximately the other. Move to rest position.

At this time, since the coil belonging to the other stationary position is excited, the armature When it comes close to the pole surface of the coil, it is captured by this pole surface, and other It is held in one rest position.

The graph labeled Coil 1 is the coil that holds the gas exchange valve in the closed position. Assume that it represents the current course. When attempting to open the gas exchange valve, At this point, the current in coil 1 is cut off, and the armature is moved to the open position of the gas exchange valve by the spring force. be moved to another location.

Since the computer has precalculated the time tl, the armature of the gas exchange valve is Replacement Valve Ru. When the armature hits the pole face, a sufficiently high current is applied to capture the armature. In order to ensure sufficient force for the It can be done. At time t2, the armature is captured by the pole face of coil 2, which means that the It can be identified by the corresponding small notch in the graph showing the course of the flow. can.

Time t when the current in coil 2 begins to rise. and time t1 when the current in coil 1 is cut off. is controlled on the basis of the crank angle, whereas the time between points t1 and t2 i.e. gas as the armature moves from one pole face to the other and is captured. The travel time of the replacement valve is independent of the crank angle and the rotation speed of the crankshaft.

This period tz tt is the period when the armature is removed from the coil 1 after cutting off the current to the coil 1. Significantly affected by the holding time at the pole surface before separation and the spring force acting on the gas exchange valve. determined by the pure travel time.

According to the invention, the computer is switched to time-based control and , and at a time t, which is slightly later than the expected acquisition time of the armature. The capture current of 2 is cut off. Then the current flowing through coil 2 is a freewheel circuit , followed by a phase in which the armature is held by a clock pulse.

The time between t2 and t3 is when the gas exchange valve is actually captured by coil 2 and pulled followed by a period of safety to ensure that it is held in the fully open position. .

At time t, the computer switches back to control based on the crank angle information. However, this allows the clock pulse to stop at time t1 in coil 1. The efficiency of the internal combustion engine can be improved by accurately determining the phase of the crankshaft. This is to try to optimize.

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Claims (2)

[Claims] 1. at least one gas exchange valve, the coil of the first electromagnet being energized; The gas exchange valve is held in the open position by and the coil of the second electromagnet is energized. The gas exchange valve is held in the closed position by the current in the coil of the first electromagnet. is shut off, the gas exchange valve moves from the open position to the closed position under the force of the spring. The current in the coil of the second electromagnet is cut off, causing the battery to move to an internal combustion engine configured to be moved from a closed position to an open position in response to a load The point at which the current is interrupted is controlled by a computer, and the current is interrupted. Until this happens, the computer calculates this shutdown point based on crank angle information. at least as long as the gas exchange valve is moved. A method of operating an internal combustion engine, characterized in that the engine performs control based on time information. 2. The crankshaft rotates while the computer performs time-based control. Claims characterized in that crank angle information is evaluated to investigate changes in number. A method of operating an internal combustion engine according to scope 1.