BS ISO 20035:2019

What is ISO 20035 - Cooperative adaptive cruise control systems (CACC) about?  

ISO 20035 addresses two types of Cooperative Adaptive Cruise Control (CACC): V2V, and I2V. Both types of CACC systems require active sensing using for example radar, lidar, or camera systems. The following requirements are addressed in ISO 20035: 

Classification of the types of CACC: 

• Definition of the performance requirements for each CACC type 
• CACC state transitions diagram 
• Minimum set of wireless data requirements 
• Test procedures 

CACC: 

• Does only longitudinal vehicle speed control 
• Uses time gap control strategy similar to ACC 
• Has similar engagement criteria as ACC 

Coordinated strategies to control groups of vehicles, such as platooning, in which vehicle controllers base their control actions on how they affect other vehicles and may have a very short following clearance. CACC system operates under driver responsibility and supervision. 

ISO 20035 is applicable to motor vehicles including light vehicles and heavy vehicles. 

Who is ISO 20035 - Cooperative adaptive cruise control systems (CACC) for? 

ISO 20035 on Cooperative adaptive cruise control systems (CACC) is useful for: 

• CACC system designers 
• Vehicle manufacturing companies 

Why should you use ISO 20035 - Cooperative adaptive cruise control systems (CACC)?  

Cooperative Adaptive Cruise Control (CACC) system is an expansion to existing Adaptive Cruise Control (ACC) control strategy by using wireless communication with preceding vehicles (V2V) and/or the infrastructure (I2V). Both multi-vehicle V2V data and I2V infrastructure data. When V2V data is used CACC can enable shorter time gaps and more accurate gap control, which can help increase traffic throughput and reduce fuel consumption.  

The V2V communications can provide the ACC system with frequent updates about the speed, acceleration, and commands (throttle and brake) of multiple vehicles driving in the surrounding area of the CACC-equipped vehicle. This enables the following performance improvements over ACC: 

• Higher-accuracy control of vehicle following gap, while maintaining smooth ride quality 
• Significantly faster responses to speed changes by multiple forward vehicles, not only the vehicle immediately ahead of the subject vehicle 
• Shorter vehicle-following gap settings, without compromising safety or driver confidence and comfort with the system. 

ISO 20035 provides performance improvements that produce the following benefits: 

• Increased driver confidence in the responsiveness of the system, leading to a willingness to select shorter gap settings and use ACC under a wider range of traffic conditions 
• Fewer cut-ins at the shorter gaps may make ACC acceptable to a wider range of drivers 
• Significant damping of traffic flow disturbances, improving traffic flow dynamics and thereby reducing energy use and emissions 
• Significant increase in the effective capacity (throughput) per lane of highway traffic