National Instruments 370769C-01

Chapter 1 Introduction

Num Ext. In = @num_sb_in_i@

Num Ext. Out = @num_sb_out_i@

Num SuperBlocks = @num_blks_in_sb_i@

Attribute = @sb_attr_s@

Frequency = @sb_freq_r@

Has Input Data = @sb_has_in_data_b@

@ENDSEGMENT@

Example 1-2 DocumentIt ASCII Output File

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Software Design Document

Overview : This cruise controller regulates vehicle speed around a set

point.

This cruise controller has three external inputs as follows:

the desired "speed" or velocity of the vehicle,

the current "speed,"

the current "acceleration" of the vehicle.

This cruise controller has one external output, which is the throttle

actuator command.

Architecture: There are three SuperBlocks in this model.

The SuperBlocks are as follows:

the "Differentials" SuperBlock computes the difference between desired and

measured velocity and acceleration, adds computed target acceleration to

measured acceleration, and outputs a servo-limited throttle command based

upon these differences

the "Cruise Control Logic" SuperBlock determines whether or not throttle

position should be altered, based upon the difference between actual and

desired vehicle velocity, and

the "Mux3" SuperBlock determines the target acceleration based upon

inputs from the control logic.