Nissan Motor Company Limited

Isao Murase

Akira Shimozono

Katsutoshi Hirose

Takao Ito

Akinobu Moriyama

Shoji Yoneya

In an automatic test vehicle driving system on a chassis dynamometer, a table between accelerator actuator stroke and engine output torque and a table between engine friction loss power and engine speed are formed and stored by teaching operation before vehicle travel test. During travel test, command accelerator actuator strokes are determined with reference to the formed stroke-torque table when the test vehicle is accelerated or kept at a constant speed to reduce setting time for each test vehicle. Further, it is determined whether vehicle speed can be decelerated by only engine brake or by depression of brake pedal with reference to the formed friction loss power-engine speed table to prevent unnecessary braking operation. Since engine output torque can be determined in open-loop control, complicated control gain adjustment setting work can be eliminated.

Automatic vehicle driving system and method of driving the same on

For use on automobiles, the invention provides a compact device for measuring the concentration of a nitrogen oxide in a combustion gas such as an exhaust gas of an internal combustion gas. The device has an ion pumping cell using an oxygen ion conductive solid electrolyte to adjust the partial pressure of oxygen in a gas diffusion chamber and a sensor such as an oxygen concentration cell using a solid electrolyte to detect the partial pressure of oxygen in the chamber. The pumping cell or the concentration cell is provided with a catalyst which decomposes the nitrogen oxide in the diffusion chamber only when the partial pressure of coexisting oxygen is sufficiently low. In the device the current supplied to the pumping cell is measured when the partial pressure of oxygen in the diffusion chamber is low enough for the activity of the catalyst and also when the oxygen partial pressure is made too high, and the concentration of the nitrogen oxide in the gas is computed from the two values of the current and the known relationship between the concentration of oxygen in the gas and the current necessary for keeping each of the high and low partial pressures of oxygen. It is convenient to use a pair of combinations of the pumping cell and the concentration cell to keep the high partial pressure of oxygen in one combination and the low partial pressure of oxygen in the other.

Device for measuring concentration of nitrogen oxide in combustion gas

A flame detector analyzer of the type wherein a sample gas is introduced into a flame formed by burning a fuel gas in presence of a combustion supporting gas, comprises a background providing device for supplying a background component gas capable of emitting a characteristic spectrum having the same wave length as that of the characteristic spectrum of a measuring object component contained in the sample gas, the light spectrums emitted from the measuring object component and the background component gas being received and treated to be detected, thereby increasing the measuring accuracy for the measuring object component and improving the resolving power at a low concentration detection region.

Flame photometric detector analyzer

A flame photometric detector analyzer comprises a first conduit through which a fuel gas flows, a fuel gas nozzle connected to the first conduit to be supplied with the fuel gas to form a flame at the tip thereof, a second conduit through which a combustion supporting gas is supplied to the vicinity of the tip of the fuel gas nozzle to assist the combustion of the fuel gas discharged from the nozzle, a third conduit through which a sample gas having a measuring object component is supplied to the flame, a device for controlling the concentration of oxygen contained in the combustion supporting gas to be supplied to the flame within a range from 11.5 to 16%, and a device responsive to photoemission from the measuring object component of the sample gas introduced into the flame, thereby decreasing the effect of interference substances to obtain high accuracy of measurement even though the measuring object is of considerably low concentration.

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Yokosuka, Japan

Isao Murase