DE2647931A1 - METHOD OF SPEED CONTROL OF COMBUSTION ENGINES - Google Patents

Description

^{Fo 10 212 D} Oct. 22, 1976

DlpL-lng. Jürgen WEINMILLER 9 26 479 31

PATENT ASSESSOR

GmbH

80OO Munich 8O

Zeppe / instr. 63

SOCIETE GENERÄLE DE CONSTRUCTIONS ELECTRIQUES

ET MECANIQUES ALSTHOM S.A. 38, avenue Kleber, 75784 PARIS CEDEX 16, France

METHOD OF SPEED CONTROL OF COMBUSTION ENGINES

The speed control of internal combustion engines is known to be achieved by mechanically acting on the fuel feed is acted.

Devices for this often consist of hydromechanical assemblies or, more recently, also of hydroelectric assemblies Organs that receive an electrical signal taken from the motor shaft.

The hydroelectric organs are made up of two different ones Parts formed; an electronic stage for processing the electrical speed signal sent by a sensor arranged on the motor shaft, and an electro-hydraulic stage which converts the

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performs electrical control command into a mechanical command; this mechanical command is often represented as the rotation of a shaft on which, for example, the control lever of the Injection pump of a diesel engine is arranged. The torque available varies depending on the different regulator models.

The object of the invention is to improve such control methods. This task is achieved by the claim specified procedural features solved.

Preferably, the DC motor is provided with a mechanical reduction gear so that it can work very well variable conditions of use can be adapted, for example to the angle of rotation of the control shaft, to the necessary Moment, to the minimum operating time, to the functional accuracy threshold of the control command, etc.

It is also advantageous if a mechanical fault occurs in the supply of the electronic circuits Safety device brings the rotor of the DC motor into the closing stop position.

The method according to the invention is described below using an exemplary embodiment that controls a diesel engine relates, explained in more detail with reference to the single figure which shows the block diagram of a control loop.

In the drawing, a diesel engine 1 is shown symbolically, the speed of which is to be controlled; a probe 2 supplies the control loop with speed information in the form of a frequency. This is done with the help of a frequency / voltage converter 3 high precision with wide passband and very

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low frequency drift converted into a voltage.

This voltage is input into a summer 4 and compared with the voltage of a nominal voltage generator 5; the differential voltage Af is then sent to a regulator 6 fed via a further summer 7, this controller being a PID controller and depending on the one at its input incoming amplitude acts.

The controller prepares an opening command S for the the speed of the motor 1 regulating body.

This opening command S runs through a discriminator 8, which takes into account a limit value Lo displayed by a further setpoint generator 9 for the opening restriction. From the Output of the discriminator 8, the signal runs through a Summer 10, which controls the position via a differential transformer 11 receives with coupling core, and then via a thyristor amplifier 12, which the thus amplified signal to a Direct current servomotor 13 with very little inertia, which controls the organ 14 regulating the fuel supply to the engine 1 ″.

For the more general case that several machines are fed from the mains, one must be adjustable to motor 1 Basic regulation should be provided. For this purpose, the opening command S worked out by the controller 6 with a the opening setpoint of the regulating member 14 displayed by a setpoint generator 15, which corresponds to the power, that the engine is supposed to deliver. After damping by a damping device 17, the resulting command is sent to the input of the Regulator 6 fed back via the summer 7.

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If the regulating member 14 is not to exceed the target opening Lo indicated by the transmitter 9, the discriminator selects 8, which receives the opening command S on the one hand and the setpoint Lo on the other hand, the smaller of these two values.

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Empty soap

Claims (1)

PATENT CLAIM Method for regulating the speed of an internal combustion engine, characterized in that one uses an electronic processing stage for a speed signal of the motor, which is generated by a PID controller with subordinate Basic control and control limiter is developed, an electrical analog signal is created that corresponds to the manipulated variable, i.e. corresponds to the position of the fuel-supplying element (14) of the engine (1), and that this analog signal via an amplifier (12) acts on a DC motor (13) of low inertia, which adjusts the organ (14), the organ with The position of a differential transformer with a coupling core is controlled. χ χ ORIGINAL INSPECTED 709819/0655