| 摘要 |
Exhaust gases of a motor vehicle wherein the exhaust pipe contains a three-way catalytic converter downstream of a lambda sensor are sampled by a standard HC and CO detector downstream of the converter and the corresponding signals are transmitted to a computer which stores reference signals denoting the desired parameters of exhaust gases in a particular vehicle. The computer further receives signals from the lambda sensor, either directly or by way of a separate memory. The latter can be installed in and can be transported by the motor vehicle to memorize signals from the sensor while the vehicle is in motion. The computer compares signals from the memory and signals from the detector with stored reference signals. The testing can be carried out in several stages. For example, a complete test can include a first stage while the engine is still cold and the computer receives signals from the detector, a second stage while the vehicle is in motion and transports the computer and/or the memory, and thereafter a third stage while the engine is hot and the computer receives signals from the detector.
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