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Circuit arrangement for electronic control of an internal combustion engine
| Details |
Inventors: Hartmann, Uwe; Mai, Udo;
Assignee: Vogt Electronic Ag (Erlau bei Passau, DE)
Primary Examiner: Dolinar; Andrew M.
Assistant Examiner:
Attorney, Agent or Firm: Mason, Fenwick & Lawrence
The invention provides a circuit for electronic control of an internal combustion engines including injection valves that can be activated electrically as a function of regulated variables such as crankshaft position, engine speed, exhaust-gas composition and engine torque. The circuit includes an electronic control unit with means to activate the intake valves, exhaust valves, injection valves and ignition device as a function of ignition duration and ignition timing. The control unit also includes a start-up program with which ignition sequences of the engine cylinders, intake valves, injection valves and ignition device can be activated for any desired cylinder position of an engine-start-up process. The circuit further includes a program memory, an engine-standstill detection circuit, and an absolute-value angle transmitter to which the engine-standstill detection circuit is responsive. The absolute-value angle transmitter includes a coding disk that is integrally connected with the crankshaft of the engine, circuitry for generating signals corresponding to the crankshaft position during standstill and during rotational movement, and circuitry for generating electrical signals corresponding to engine temperature, engine load and engine knocking. The signals are fed as regulated variables to the electronic control unit. |
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DETAILED DESCRIPTION The object of the invention is to provide an electronic control system for internal combustion engines that avoids the aforesaid deficiencies, has high operating reliability and can be manufactured inexpensively.
This object is achieved according to the invention.
A circuit arrangement according to the invention for internal combustion engines has, an essential components, an electronic control unit (computer), an absolute-value angle transmitter, an engine-standstill detection circuit, an ignition-sequence circuit and a valve-control device.
The activation of the electrical functions of the ignition-sequence circuit and of the valve-control device is effected by the electronic control unit.
For activation of the control unit, electrical signals conditioned by means of signal-shaping modules and representing regulated variables are fed to the computer by the absolute-value angle transmitter, which acquires the crankshaft angle in the dynamic and static condition.
Furthermore, electrical signals, by means of which the angle transmitter code and the valve operating sequence are monitored, are fed to the control unit by the absolute-value angle transmitter and the valve controller.
With a fully electronic circuit device as proposed according to the invention for control of the internal combustion engine, the following advantages can be achieved: 1.
an electrical starting aid (starter) can be dispensed with, 2.
a mechanically driven ignition distributor can be dispensed with, 3.
a camshaft controlling the intake and exhaust valves can be dispensed with and 4.
a new type of control system of a two-stroke internal combustion engine, in which, in particular, the fuel-air mixture composition and the phase angle between fuel injection and piston position are electrically controllable as a function of the operating data.
The absolute-value angle transmitter consists of a wheel mounted on a crankshaft, which wheel has on its surface a clearly identifiable code, which is sampled by a sensor
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Exercise Devices 
