2.2. Analisis Sistem Kendaraan

2.2.1. System model and parameters

2.2.2. Performance specifications

The next step is to come up with some design criteria that the compensated system should achieve. When the engine gives a 500 Newton force, the car will reach a maximum velocity of 10 m/s (22 mph), see open-loop step response section below. An automobile should be able to accelerate up to that speed in less than 5 seconds. In this application, a 10% overshoot and 2% steady-state error on the velocity are sufficient.

Keeping the above in mind, we have proposed the following design criteria for this problem:

Rise time < 5 s Overshoot < 10% Steady-state error < 2% Open-loop step response The open-loop response of the system, without any feedback control, to a step input force of 500 Newtons is simulated in MATLAB as follows:

m = 1000;
b = 50;
u = 500;

s = tf('s');
P_cruise = 1/(m*s+b);

step(u*P_cruise)