Throttle Valve Body Assembly; Three-In-One Sensor - Segway SNARLER ATV 2021 Series Service Manual

ELECTRICAL SYSTEM

Throttle valve body assembly

The throttle valve body assembly is connected to the
engine and the air fi lter. The user can control the opening
and closing angle of the throttle valve through the throttle
A
cable to achieve diff erent driving intentions. The structure
and size of the main passage of the throttle body are
directly related to the amount of air entering the engine,
and the performance of the engine at different speeds
can be changed by changing the main passage. The
valve body assembly includes: a mechanical throttle body
assembly, a three-in-one sensor (intake pressure, intake
temperature and throttle position sensor) and a stepper
motor
Disassemble the entire vehicle seat cushion and left side
cover to see the throttle valve body assembly(See A on
the left)

Three-in-one sensor

The three-in-one sensor includes: intake pressure, intake
temperature and throttle position sensor. The pin diagram
is shown on the left.
Vp: intake pressure signal;
GND: sensor ground;
Ts: intake air temperature signal;
The core of the intake air temperature sensor is the
thermistor that responds quickly to temperature. The
intake air pressure sensor communicates with the main
channel of the throttle body through the air pressure
channel on the throttle body to detect the absolute
pressure of the intake air. When the pressure in the main
channel changes, the output voltage of the pressure chip
will also change accordingly. Through the corresponding
relationship between the output voltage and the absolute
pressure of the main channel, the ECU can obtain the
absolute pressure value of the main channel at this time.
The throttle position sensor is an angle sensor with linear
output, composed of two arc-shaped sliding contact
resistors and two sliding contact arms. The rotating shaft
of the sliding contact arm and the throttle body shaft are
connected on the same axis. A voltage of 5V is applied
to both ends of the sliding contact resistance. When the
throttle valve rotates, the sliding contact arm rotates and
moves on the sliding contact resistance at the same time,
and outputs the potential of the contact as a voltage,
which is actually a corner potentiometer.
14 - 30
Vin: 5V power supply;
Vtps: throttle position signal;