Method and device for monitoring a first voltage value

A technology of voltage value and signal voltage, which is applied in the field of checking the first voltage value, can solve the problems of waste of resources, inability to apply safety-critical functions, and increase the burden of SPI-resources, etc., and achieve the effect of easy operation

Inactive Publication Date: 2008-07-30
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this solution is especially the additional cost of the 5V-ADC-component
In addition, most of the channels of the multi-channel ADC-component are not used, which is also an additional waste of resources
In motor vehicle manufacturing, the application of CY100 in engine controllers is limited, because the SPI-bus (approximately 1ms scanner) restricts the reading speed of ADC-values, so that this component cannot be used for safety-critical functions (such as rail pressure)
This component also additionally burdens the resources of the SPI-

Method used

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  • Method and device for monitoring a first voltage value

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Embodiment Construction

[0043] FIG. 1 shows the prior art connection of a sensor 100 to a microcontroller 150 in a motor vehicle. The sensor 100 has a housing 101 which is schematically indicated by dashed lines. Furthermore, the sensor 100 has a connection 102 for a supply voltage of +5 volts in the illustrated case and a connection 103 for ground. The voltage range from 0 V to 5 V, which is indicated by the arrow labeled Usens, is therefore available for the sensor voltage or output voltage Us. The potential of the output voltage Us is indicated by the arrow marked Us.

[0044] Sensor 100 has an output 104 at which sensor signal Us is provided. The sensor is designed as a so-called pull-up-down-wiring (Pull-Up-Down-Beschaltung). With this wiring, the signal lines are connected to the supply voltage and ground through resistors. In the diagram shown, the signal line 104 a is connected via a pull-up resistor 105 to the supply voltage 5V and via a pull-down resistor 106 to ground 0V. The function...

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Abstract

The invention relates to a method for monitoring a first signal voltage value (Us) which is producible by an electronic component (100), positioned within the range of a signal voltage (Usens) and is detectable by a measuring device (150) whose input voltage range is less than the range of a signal voltage (Usens), wherein a voltage divider (110, 111, 112) converts the signal voltage range into an input voltage range, the first voltage value is measured by the measuring device (150), an electrical resistance exhibiting component (120) is mounted at least partially in parallel to the voltage divider (110, 111, 112), a second voltage value is subsequently measured by the measuring device (150) and the inspection result is derived from the comparison of the first and second voltage value. The invention also relates to a device (110, 111, 112, 120, 121) comprising the voltage divider, switching means (121) and the electrical resistance exhibiting component (120), which is mountable at least partially in parallel to the voltage divider (110, 111, 112) with the aid of the switching means (121).

Description

technical field [0001] The invention relates to a method and a device for checking a first voltage value according to the preambles of claims 1 and 11. Background technique [0002] The following basically relates to motor vehicle construction, but the method is not limited to this application. [0003] Microcontrollers (μC) are increasingly used in modern electrical or electronic components or general circuits (such as engine controllers), which have analog-to-digital-converters (ADC), usually multi-channel ADCs with 5V the reference voltage. These ADCs are provided for the purpose of receiving, for example, an analog voltage from a sensor in a motor vehicle (Kfz) and converting the analog voltage into a digital signal which is then further processed. [0004] Sensors are therefore usually designed for a supply voltage of 5V. Such an analog output or sensor signal comprises, for example, an effective measuring range of 0.5-4.5V. If the voltage measured by the ADC is in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/28G01R31/02G01D3/08
CPCG01D3/08G01R31/2829G01R31/025H03M1/129G01R31/52
Inventor W·哈森伯格
Owner ROBERT BOSCH GMBH
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