Onboard vehicle emissions measurement system

摘要

An onboard vehicle system 100 to determine vehicle engine exhaust gas emissions includes an emissions unit 10, a vehicle diagnostic system 20 (e.g. OBD or OBD II system) and one or more vehicle systems 60a, 60b... (e.g. temperature sensor, ignition system, powertrain components). During calibration the emissions unit 10 is directly connected to, and receives data from, both the vehicle diagnostic system 20 and some of the vehicle systems 60a-c. Some of the vehicle systems 60d, 60e are connected to the diagnostic system 20 (figure 2). In use the emissions unit 10 is only connected to, and only receives data from, the vehicle diagnostic system 20, which in turn is connected to and receives data from the one or more vehicle systems 60a, 60b... The vehicle emissions are determined in real time based only on the data received by the emissions unit 10. The calculation of emissions may occur onboard in the emissions unit 10, or the data may be stored within the system and transmitted wirelessly via a communications interface 30 (e.g. mobile phone interface) to a remote station for processing. The emissions unit 10 may also be connected to a vehicle location unit 40 (e.g. GPS receiver) and position data used as an additional parameter in the calculation of emissions.