DE3121644A1 - Acoustically guided calibration method - Google Patents

Abstract

An acoustically guided calibration method for universal test instruments for motor vehicles is proposed in which the difference between a nominal value and an actual value is output as an acoustical signal. The signal is output in the form of a pulsating fixed frequency in which, the smaller the deviation of the actual value from the nominal value, the greater the mark/space ratio. When the nominal value is reached, the pulse sequence changes into a continuous tone. <IMAGE>

Description

Acoustically guided adjustment procedure

PRIOR ART The invention is based on a method the genre of the main claim. It is already known in the maintenance of a vehicle read the measured variable optically and compare it with a given table value. Furthermore, optical alignment systems are already known in which a pointer with Hand can be adjusted to a setpoint and a second pointer is provided which displays, for example, the dwell angle or other measured variables of the vehicle. The measured variable is adjusted until both pointers are aligned are. However, such adjustment processes require full attention and concentration of the testing staff. The test staff must carry out the adjustment and at the same time the Observe the visual display in the test device, taking into account technical conditions does not always allow the visual display to be optimally placed. Such a balancing process is therefore cumbersome and difficult to accomplish.

Advantages of the invention The method according to the invention with the characterizing Features of the main claim has the advantage that the test staff is independent of the visual display during adjustment work. This is the test device can be set up advantageously for the measurement process.

The ad itself does not need to be visible.

The measures listed in the subclaims are advantageous Further developments and improvements of the method specified in the main claim are possible.

It is particularly advantageous that the difference between the target value and the actual value is output as a pulsating fixed frequency, the pulse-pause ratio is a measure of the target / actual value difference.

This means that the alignment direction and the still existing one are used during alignment Errors immediately recognizable. It is also advantageous to use the signal evaluation and To have pulse frequency processing carried out by a microprocessor. In particular for devices with a built-in microprocessor there are only a few additional parts required so that these devices can be easily and cheaply expanded or existing devices can be converted.

Drawing An embodiment of the invention is shown in the drawing and explained in more detail in the following description.

Description of the exemplary embodiment The figure shows a microprocessor 1, which contains storage units in addition to the central unit. The microprocessor 1 is connected to a data line 2 via which addresses can also be transmitted programmable timer 3 in conjunction. The programmable timer 3 has a Input 4 to which the processed measurement signal is applied. Furthermore, the programmable timer 3 has an output which leads to amplifier 5.

A loudspeaker 6 is connected to the amplifier 5.

The measuring signal present at input 4 is determined by the programmable Timer converted into a digital word and read into microprocessor 1. The software of the microprocessor 1 forms the difference between the actual value and a setpoint stored in the microprocessor, for example via a keyboard is entered 'or is called up from a special setpoint memory. The so The calculated amount is converted into a pulsating fixed frequency, whereby it is indifferent is whether the deviation is in a positive or negative direction. The bigger the deviation from the setpoint, the slower the pulse train, i.e. H. the pulse-pause ratio gets smaller. When the setpoint is reached, the pulse sequence changes to a continuous pulse above. This signal generated in the microprocessor is controlled by the programmable timer 3 delivered to the amplifier 5, amplified there and through the loudspeaker, for example can be housed in the measuring device, transmitted to the outside.

Claims (3)

Claims W method for adjusting a measured variable in test devices for automotive systems, characterized in that the difference between one The setpoint and the actual value are output as an acoustic signal. 2. The method according to claim 1, characterized in that the difference is output as a pulsating fixed frequency between the setpoint and the actual value, The pulse-pause ratio is a measure of the difference between the setpoint and the actual value. 3. The method according to claim 1 or 2, characterized in that signal evaluation and pulse frequency processing by a microprocessor he follows.