adaptivecruisecontrol

Acc using the LPC 2148 controller board with code written in C language in KEIL and simulated in Proteus

ACC is an optional control system for vehicles that automatically adjusts the vehicle speed to maintain a safe distance from vehicles ahead. Control system consists of distance sensors like ultrasonic, radar. Following image provide an overview for ACC. Figure 1: Overview of Adaptive Cruise Control User control settings varies depending upon manufacturer, still basic functionalities are as follows:

1. Set max speed to be maintained.
2. Set minimum distance to be allowed with that speed.
3. Start ACC mode
4. Stop ACC mode
5. Store set parameters

I MPLEMENTATION : : In this project ACC demonstration is done using Photo diode sensor to measure distance and included all above basic features using tactile switches. Figure 3: Switches arrangement for demonstration Operation:  Press SW1 to go to speed and distance setting mode  Using SW2 select parameter to select (Even press – Speed selected, Odd press – Distance selected)  Using SW3 and SW4 for increment and decrement selected parameters respectively  Press SW1 again will ask for ACC starting confirmation. [Note: Set data gets stored at this stage]  Press SW1 again and ACC will start [Note: During ACC mode speed will vary according distance between vehicles, this speed variation is just displayed on LCD and PWM is also generated accordingly]  Press SW1 to switch off ACC mode if turned ON. Constraints:  Speed can be set is range between (40-80 Kmph) and distance (1-10m). [Note: these are not to the scale]  If speed falls below 40Kmph ACC mode switched off with 3 beep indications. [Note: Each key stroke is provided with one beep stroke] Feature:  Set values are stored in external EEPROM chip and are recalled during starting ACC mode.  Per Speed change beep is provide to notify driver. Following are components used:

1. LPC2148 development board
2. Photo diode sensor
3. UART to USB converter
4. Buzzer
5. LCD
6. EEPROM IC