By Trevor Mellard
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Additional info for Automotive Electronic Systems
5(a)) to provide a linear output. 4 Typical types of DC motors Iron-cored motor Ironless motor DC servo motor system DC servo motors The servo motor makes use of a variable DC voltage for speed control. A potentiometer driven by the motor provides speed and position feedback to form a self-contained positioning system. 4(c). These motors are used where precise position control is necessary along with high-speed operation. shows a small electric linear actuator which com prises a low voltage DC motor and short gear train driving a lead screw to provide the linear output, primarily designed for operating flaps in a heater or air conditioning unit.
11 Excitation current Iexc as a function of on time Ton and off-time ToS. The relationship between on-time and off-time is decisive with regard to the magnitude of the resulting mean excitation current Im. The excitation current rises along curve a and decays (decay current iA) along curve b. The graph is intended to convey a general impression only. The values shown are not in accordance with actual values. 12 Electronic voltage regulator. Circuit diagram field excitation current on and off while the Zener diode is used for controlling the transistors by acting as a voltage sensitive switch.
But, when the oxygen content at each Zr02 probe differs, a voltage is generated across the two. 20(a), where the negative oxygen ions under atmospheric pressure permeate the porous electrode and accumulate on its surface, giving it a negative charge the size of which is dependent upon the amount of oxygen in the exhaust gas. Exhaust gas. ,i Electrodes L^Ö2Exhaust pipe : Porous protective coating -Electrons free for conduction Ti0 2 . semiconductor Titanium oxide Titanium oxide exhaust gas sensors need no ref erence to ambient air.
Automotive Electronic Systems by Trevor Mellard