Explanation; Circuit Descriptions - Pioneer AVG-VDP1 Service Manual

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7.3 EXPLANATION

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7.3.1 CIRCUIT DESCRIPTIONS

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A
- What You Can Do with AVG-VDP1
•
Indication of various vehicle dynamic information
Speed, engine revolution number, power supply voltage, back-and-forth acceleration G,
side-to-side G, revolution angle speed, horsepower, torque, gradient
• Indication of GPS acquisition information
Time, latitude/longitude, direction, altitude
• Easy navigation function via GPS
- Revolution Number Detection Circuit 1
• The revolution number can be read from power source noise.
Alternating current elements via a generator for battery charging
-> Relative to the engine revolution number
B
There is a definite relation between alternating current frequency and the engine revolution number.
• Frequency at 4000 rpm can be set by user operation.
Linear complement between 0 rpm = 0Hz and 4000 rpm
- Revolution Number Detection Circuit 2
• Circuit block
Remove if checking
C
TE
L 13942296513
Remove 0 Ω resistor , and input test signals from here without 0 Ω at diagnosis
Input 200mVp-p sine waves and confirm change of output voltage according to frequency
Form alternating current waveforms and convert them to direct current with a frequency/voltage conversion IC
- Other Measurement
D
• Speed
-> Calculated from the car speed pulse (at 3D hybrid)
• Power Supply Voltage
-> Read 9-15.6V with 8-bit A/D
• Back-and-forth acceleration G
-> Calculated from change of the car speed pulse
• Revolution angle speed
-> Output of a gyro sensor
• Side-to-side G
-> Computed from the car speed and revolution angle speed
E
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