Prescan quick start to proficient in lecture 17, speed curve editor

There are many ways to describe how a car should move with speed . One of the concepts is using time . Time can be used to describe the behavior of cars in time-related time . Imagine " Speed up 10 second " and " Let go of the gas 100 rice " Examples like this . The speed curve editor provides this intuitive way to input speed curve information . The supported types are " Speed curve type (Speed Profile Slot Types) " It is explained in . 

In addition to allowing the input and modification of speed information , The speed curve editor can also visualize the speed curve as a function of time or distance . Besides , Once the velocity profile matches the path , It also provides information on the resulting longitudinal and lateral acceleration levels .

17.1 Speed curve slot type

The speed profile editor provides four types of slots , They are :

Smooth acceleration / Slow down

Suddenly release the throttle

Idle wait

Constant acceleration / Speed  

Speed curve type  ：

Steady acceleration / Slow down  

The user can set an acceleration or deceleration level . then , The system will accelerate or decelerate smoothly -- It looks like a sine shape in the velocity diagram -- Until the final speed is reached . In addition to setting the acceleration and deceleration levels , Users can also choose to use distance 、 Speed 、 Total distance 、 The second condition is introduced for variables such as segment number and time . If the combination option is selected , Then before the second condition is met , The speed achieved through the smooth acceleration and deceleration option will remain unchanged . 

Sudden throttle release  

This type will simulate the sudden release of the car throttle . There are several variables to set when selecting this groove . They are the air density and gravitational acceleration of the environment , And the rolling friction coefficient of the car itself 、 Drag coefficient 、 Vehicle mass 、 Reference area 、 Maximum acceleration and maximum deceleration . Again , The user can set a combination option . 

Idle wait

This type will make steam