CLTC Range

CLTC range refers to the cumulative driving distance achieved when a fully charged battery electric vehicle (BEV) or plug-in hybrid electric vehicle (PHEV) is run continuously on a chassis dynamometer under the China Light-Duty Vehicle Test Cycle (CLTC) protocol until the traction battery is completely depleted. As the primary nominal range benchmark in China's new energy vehicle market, it simulates real-world driving conditions across urban traffic, expressways, and suburban routes, providing consumers with a standardised reference to evaluate a vehicle's daily all-electric capability.

Core Technical Architecture and Test Evaluation Principles

Determining the CLTC range figure relies on rigorous dynamometer test cycles, high-precision energy consumption metering, and state-of-energy calibration via the Battery Management System (BMS). 

Standardised Dynamometer Cycle & Depleting Test: 

Under controlled laboratory ambient temperatures, the test vehicle is mounted on a chassis dynamometer to execute an 1,800-second speed-time profile covering low, medium, and high-speed phases. Technicians log the vehicle's continuous operation from a 100% state of charge (SOC) until the traction battery triggers low-voltage cut-off protection or is fully drained, with the official CLTC range calculated from the total accumulated mileage. 

Multi-Source Energy Consumption & Environmental Correction Model: 

Throughout the test, energy drawn by the drive motor, air-conditioning system, on-board electronics, and thermal management (including battery temperature regulation) is comprehensively factored in. The BMS continuously tracks ampere-hour integration and voltage fluctuations, calculating remaining capacity and range estimation algorithms in real time to ensure test reproducibility and regulatory compliance within standardised boundary parameters. 

Safety Specifications and Physical Limitations 

Never Rely Blindly on CLTC Range for Extreme Long-Distance Highway Route Planning:

Because the CLTC cycle features a modest average speed (approx. 28.9 km/h) with frequent stop-and-go traffic and idling phases, its ratings are generally higher than real-world continuous high-speed highway cruising ranges. Drivers must never calculate long-distance highway charging stops purely based on the full CLTC figure without factoring in a safe buffer, preventing premature battery depletion caused by exponentially higher aerodynamic drag at highway speeds.

Strict Adherence to Range Decay Expectations and Charging Plans in Extreme Weather: 

In extreme sub-zero cold or scorching tropical heat, climate control (cabin heating or heavy air-conditioning) draws substantial power from the traction battery. Drivers must never overlook the risk of severe range drops during long-distance journeys in extreme temperatures—where actual driving distance may fall far below the official rated figure. Intermediate charging stops must be planned well in advance to prevent breakdowns caused by thermal anomalies or battery exhaustion.