draw the Indian driving cycle and explain the various stage ? ~ Engineering Stream

🚗 Indian Driving Cycle (IDC) – Diagram & Explanation

The Indian Driving Cycle (IDC) is a standardized test procedure used to evaluate the emission and fuel consumption of vehicles under simulated urban driving conditions in India. It reflects typical traffic patterns, including frequent starts, stops, and idling.

📉 IDC Graph (Speed vs Time)

Below is a simplified sketch of the IDC. The graph shows vehicle speed (km/h) on the Y-axis and time (seconds) on the X-axis.

Speed (km/h)
  |
  |          ___      ___
  |         |   |    |   |___         ___
  |         |   |    |     | |___    |   |
  |         |   |    |     |    |___ |   |__
  |_________|   |____|     |____|   ||      |___
 0|________________________________________________ Time (s)
   0    40   80  120  160  200  240  280     320   340

Legend:
- Speed fluctuates between 0 to ~40 km/h
- Several idling phases (flat near 0 km/h)
- Total duration: ~340 seconds
- Total distance covered: ~1 km

🧩 Phases of Indian Driving Cycle (IDC):

The IDC is divided into 2 parts:

🔹 Part 1 – Idling and Acceleration Cycles:

Duration: ~195 seconds
Distance: ~0.5 km
Stages Include:
1. Initial Idling (11s) – Engine ON, speed = 0.
2. Acceleration to 15, 25, and 40 km/h – Simulates urban speed changes.
3. Short cruising periods – Constant speed phases.
4. Frequent deceleration to 0 – Simulates stops at signals or junctions.
5. Repeated idle-stop-run patterns.

🔹 Part 2 – Higher Load Conditions:

Duration: ~145 seconds
Distance: ~0.5 km
Stages Include:
1. Higher acceleration phases
2. Short bursts to 40 km/h
3. Rapid deceleration
4. Idle periods interspersed
This part replicates busier traffic or medium-speed roads.

🧾 Key Parameters of IDC:

Parameter	Value
Total Duration	~340 seconds
Total Distance	~1.0 km
Maximum Speed	~42 km/h
Average Speed	~19 km/h
Number of Stops	~10
Purpose	Emission & mileage testing

✅ Why IDC Is Important:

Used by Automotive Research Association of India (ARAI).
Represents typical Indian driving conditions.
Used for certifying BS-IV/BS-VI emission norms.
Helps manufacturers calibrate engine and fuel systems accordingly.

🧠 Conclusion:

The Indian Driving Cycle (IDC) provides a realistic simulation of urban Indian traffic for lab testing of vehicle emissions and fuel efficiency. It emphasizes frequent acceleration, idling, and low-speed operation, mirroring actual road conditions in Indian cities.

draw the Indian driving cycle and explain the various stage ?