DE19804764C1 - Signaling device - Google Patents

Abstract

In the case of a signal transmitter device for controlling an actuator (throttle valve of an internal combustion engine), the signals lying on signal characteristics K1, K2 are generated electromechanically, optoelectrically or electromagnetically. The signal characteristics K1, K2 run parallel to each other and have a constant distance from each other. Errors in the signaling device can thus be easily recognized.

Description

The invention relates to a signal generator device according to the Preamble of claim 1.

Developments in the field of "electronic accelerator" cause the complex mechanics to implement the "driver request "electronically.

This gives you several degrees of freedom for an intervention in the operating mode of the engine control unit, if for example wise security aspects are of paramount importance gene.

For reasons of redundancy, two-channel "pedals" are preferred value transmitter "or signal transmitter devices used.

So put the electrical signals of a two-channel "Pedal value transmitter" or a signal transmitter device source of information of an engine control system for the so-called "driver request". Here is the requested Engine power (accelerator pedal position) is usually proportional to the sensor signal or the sensor signals (with two-channel Pedal sensors).

The detection of a faulty signal state is important to validate the driver's request (safety aspects). in the Within the scope of checking the encoder signals, u. a. a short at one or between the two signal channels si be recognized, otherwise incorrect controls can occur nen.  

Based on a detected fault, the Mo corresponding safety mechanisms in operation puts. If these mechanisms intervene (e.g. emergency running), ei ne high signal resolution desired.

From DE 40 04 086 A1 a pedal value transmitter is known in which the sensors housed in the pedal value sensor are signals distant, whose signal characteristics increase congruently or falling over the actuation angle. Here is the entire resolution range of the signal voltage can be used at maximum, constant resolution. The disadvantage is that a Short-circuit detection of the signals is only possible with great effort is.

In a second variant, the two signal characteristics run with different slopes. One uses Signal channel almost the entire resolution range, however remains for the signal channel for the signal with the lower one Slope only a halved voltage range left. The Characteristic curves are therefore weighted. The failure of a signal channel has a different effect than the failure of the other Si channel. Various system reactions must be carried out will be.

From DE 40 04 085 A1 are two about the operating angle opposite, intersecting signal characteristics K1 and K2 remove. It is the entire resolution range of the Si gnale usable. The disadvantage is that for both signals a certain actuation angle (at the crossing point) short conclusions can only be identified with great effort.

The present invention is therefore based on the object to create a signaling device whose channels one have the highest possible uniform resolution range and  which a short circuit of a signal channel or between the Si channel channels is easily recognizable.

This task is performed by the characteristic part of the To spell 1 solved.

In the signaling device according to the invention Short circuit detection simple and there can be several ver different error cases, depending on whether the Si gnale or their difference predetermined maximum values over exceed or fall below specified minimum values.

The signals are generated either electromechanically Potentiometer, optoelectronic through optocouplers and the same, or electromagnetic by linear Hall sensors.

Further advantageous embodiments of the invention result itself from the subclaims.

An embodiment of the invention is in the drawing shown. Show it:

Fig. 1 is a diagram with parallel signal characteristics K1, K2 of both signal channels with a constant difference, and

Fig. 2 stands two wired potentiometers with series and post-resistance.

Fig. 1 shows two signal curves K1 and K2 of a Signalgebereinrich device (not shown) with a supply voltage Ubat. According to the invention, the two signal characteristics K1, K2 are aligned in parallel and have a constant difference Off (a defined offset). The signal generation in this exemplary embodiment takes place electromechanically by means of potentiometers.

The two lying on the signal characteristics K1 and K2, the respective potentiometer position of the signaling device corresponding signals act on a not shown Actuator.

Two potentiometers with partial resistors R1 and R2 divided by the potentiometer terabgriffe according to FIG. 2 serve as encoder elements for the signals or the signal characteristic curves K1 and K2 with different series and series resistors Ro and R3, respectively, which effect the offset. The tap voltages of the potentiometers as setpoints correspond to the signals on the signal characteristics K1 and K2, the sizes of which are proportional to the throttle valve opening.

In the opposite direction, you can check (target / actual ver equal) correspond to the throttle valve position in the same way appropriate signals (actual values) and the control or regulation device are fed.

The following errors can be identified:

• a) the signal on the signal characteristic K1 falls below one specified minimum value voltage, regardless of the actuator angle,
• b) the signal on the signal characteristic K1 exceeds one specified maximum value voltage, regardless of the actuator angle,
• c) the signal on the signal characteristic K2 falls below one specified minimum value voltage, regardless of the actuator angle,
• d) the signal on the signal characteristic K2 exceeds one specified maximum value voltage, regardless of the actuator angle,  
• e) the difference Off of the signal values on the signal characteristics K1 and K2 fall below a specified minimum value, and
• f) the difference Off of the signal values on the signal characteristics K1 and K2 exceed a specified maximum value.

Which cause is the basis of the individual error is of the type of circuit (reference potential, ground-free, etc.) dependent, but clearly to be determined.

Claims (5)

1. Signaling device for controlling or regulating an actuator of an internal combustion engine, with at least two signal channels, the signals of which are coupled to one another, characterized in that the signal characteristics (K1, K2) of the two signal channels run parallel to one another and have a constant difference (Off). 2. Signaling device according to claim 1, characterized records that the generation of act on the actuator the signals in the signaling device electromechanically by means of potentiometers (R1, R2), their tapping voltages the position of the actuator are proportional. 3. Signaling device according to claim 1, characterized records that the generation of act on the actuator the signals proportional to the position of the actuator the signaling device optoelectronic by optocouplers he follows. 4. Signaling device according to claim 1, characterized records that the generation of act on the actuator the signals proportional to the position of the actuator the signaling device electromagnetically by linear Hall sensors occur. 5. Signaling device according to one of claims 1 to 4, characterized in that the position of the actuator proportional, ent the signals of the signaling device speaking control signals generated and the control or Re Gel device are supplied.