 | The requirements and the product specifications for a system are described in separate instances containing only one component. For example, a system can be an ABS system, cruise control, a control unit or even just a sensor. A system can be assigned a part number (not mandatory).
A system is described as a part type. The specifications for a part type roughly encompass the following areas:
General Product Data 1
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General Hardware Description
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General Software Description
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Additional Design Documentation
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Development Process Specifications
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Additional specifications
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General Test Specification
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Architecture
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Connection Components Specification
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Additional Specifications
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Electrical Characteristics
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Environmental Characteristics
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Other Physical Characteristics
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Construction
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Human Machine Interface
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Additional Specifications
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Parts in Part Type
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The structure of a system (hierarchical component structure ) is described indirectly. To understand this better, there are three terms with which one should be familiar:
- Part Type
A part type is a library element which can be used ("instantiated") in a system or higher ranking part type through mounting. A part type has no description of use-related information.
Examples: a control unit, a sensor, an actuator
- Part
A part is a mounted part type or a part type in use. It is mounted or employed in a higher ranking system or part type. A part inherits all characteristics of the respective part type. The part itself has a description of use-related information.
Examples: the control unit in an ABS system, the sensor on the left front wheel in the ABS system, the sensor on the right rear wheel in the ABS system
- Part Definition
A part definition is a part type with all accessory parts (instances).
Example:
ABS system (part type)
Sensor front left in ABS system (part)
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Sensor front right in ABS system (part)
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Sensor rear left in ABS system (part)
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Sensor rear right in ABS system (part)
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In this way, a hierarchical component structure is created through successive mounting of part types in the higher ranking system or in higher ranking part types.
The following areas for use-related description are provided for each part of a component. All parameters deviating from the part type (naturally lower requirements than for the part type) can be defined here:
Electrical Characteristics
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Environmental Characteristics
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Other Physical Characteristics
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An ABS system consisting of a control unit, a sensor and an actuator (which itself consists of a cylinder and a valve) would be described by means of a part type ABS, possibly with use-related requirements for the sensor and actuator. Additionally, the sensor and actuator are also specified as part types. This example is illustrated in the following figure:
Figure 2: An example of a component structure
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