Electricity: motive power systems – With signals – meters – recorders or testing devices
Patent
1999-02-22
2000-02-22
Ro, Bentsu
Electricity: motive power systems
With signals, meters, recorders or testing devices
318443, 318444, 318DIG2, B60S 158, G01R 3134
Patent
active
060284080
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a control device associated with a wiper motor.
BACKGROUND INFORMATION
At the conclusion of the process of manufacturing wiper motors, they must be charged with electricity over an extended period for the final test (i.e., end-of-line test). In this context, the wiper motor data relevant to function and to operation are tested for a duration of approx. 5 to 6 seconds. The extended electrical charging of the wiper motor should be equated with a function corresponding to extended wiping.
In the case of a rear window wiper motor having a control unit arranged on the motor (integrated control unit), the motor's functional scope encompassing only rear window intermittent wiping and rear window washing, the rear window washing function must therefore be activated for the final test. The rear window washing function is made up of three phases: the motor start-up delay, during which the glass is already moistened with water, the subsequent wiping or wiping-washing, and the wiping-dry (usually two or three follow-up cycles). In this context, the time losses resulting from the motor start-up delay and the wiping-dry are disadvantageous for the final test. In other words, the cycle time for the production process of each motor increases unnecessarily in this context as a function of the time for the motor start-up delay and the wiping-dry time that exceeds the test time.
SUMMARY OF THE INVENTION
The control device of the present invention has the advantage that the control unit is fed with a test signal that it can recognize, resulting in an extended electrical charging of the motor for the duration of the test. After the test signal is switched off, the wiping-dry is discontinued, so that the final test is concluded rapidly and virtually without delay.
This control device is to be used with motors having an integrated control unit, since in this context motor and control unit constitute one unit to be tested in the final test.
For example, it is particularly advantageous if the operator selection of the final test is made possible by steering column switch signals. This means that, as a result of a is suitable combination of switching signals at the signal input of the control unit, e.g., triggered by the activation of a switching element which corresponds to a steering column switch having one or a plurality of keys for the functions of intermittent wiping and/or washing, these switching signals are recognized as a test signal by the control unit and thus the final test can be carried out.
Alternatively, it is advantageous that a negative test signal applied at the signal input of the control unit is recognized by the control unit, and thus the final test can be carried out. In this context, recognition of the test signal leads additionally to an immediate extended electrical charging of the motor and thus permits a rapid and virtually delay-free start of the final test of the motor. It is also advantageous that the extended electrical charging of the motor for the purposes of testing can not be unintentionally triggered by the motor vehicle driver.
The duration of the test signal applied is variable and should be selected with a view towards the desired duration of the final test.
An additional advantage results from integrating the control logic and the semiconductor output stage in an ASIC (use-specific IC) arranged on the motor. In this way, the control device is realized in a cost-effective manner.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an exemplary embodiment of a control device integrated in a motor for driving a rear window wiper.
FIG. 2 shows signals or voltage levels from a switching element, motor, test mode for final test and park position switch.
FIG. 3 shows a simplified circuit diagram for activating the final test using a negative test signal.
DETAILED DESCRIPTION
FIG. 1 depicts a control device 10 having a control unit 14 which has a semiconductor output stage, control unit 14 being integrated in a rear window wiper motor 12. A pa
REFERENCES:
patent: 3879705 (1975-04-01), Binder et al.
patent: 4611154 (1986-09-01), Lambropoulos et al.
patent: 4617510 (1986-10-01), Deicke et al.
patent: 4857812 (1989-08-01), Mochizuki et al.
patent: 5497322 (1996-03-01), Kolomyski et al.
patent: 5545956 (1996-08-01), Salvio et al.
patent: 5568058 (1996-10-01), Wendell
Ro Bentsu
Robert & Bosch GmbH
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