Currier Tech 750 DD Series Service Manual download pdf (Page 11)

Currie Technologies // Service Manual (Version 2008a)

Crankset with

PTS Torque Sensor

TORQUE SENSORS

Electric bicycles with this system have no throttle. They must

be pedaled like a normal bicycle in order to engage the motor

drive system.

PTS (Pedal Torque Sensor)

Electric bicycles with this system have no throttle. They must

be pedaled like a normal bicycle in order to engage the motor

drive system.

Begin by ﬁ rst riding the bicycle normally as if it were not an

electric bicycle. Naturally as you accelerate and push harder on

the pedals, the motor system will increase its force to help you.

If you are ascending a hill and pushing the pedals hard, the

motor will assist you by pushing proportionately with your

pedaling force. If you are descending a hill and putting very

little force on the pedals, the motor will also not be pushing very

much.

The PTS sensor works by measuring the deﬂ ection of the

crankset under pedaling load. There are several magnets inline

inside the crankset held in place with springs. When torque is

applied to the crankset the magnets move slightly. The sensor

measures this slight movement and calculates that as torque.

Also as you pedal, the magnets spin, and this is measured as

cadence (RPM). All this information is gathered by the sensor

and fed into the controller to be analyzed and output power

impulse bursts are sent to the motor.

TMM4 (Frame Torque Sensor)

Electric bicycles with this system have no throttle. They must

be pedaled like a normal bicycle in order to engage the motor

drive system.

Begin by ﬁ rst riding the bicycle normally as if it were not an

electric bicycle. Naturally as you accelerate and push harder on

the pedals, the motor system will increase its force to help you.

If you are ascending a hill and pushing the pedals hard, the

motor will assist you by pushing proportionately with your

pedaling force. If you are descending a hill and putting very

little force on the pedals, the motor will also not be pushing very

much.

The TMM4 sensor works by measuring the deﬂ ection between

the frame and right side dropout. The sensor measures this

slight deﬂ ection and calculates that as torque.

This torque value is fed into the controller to be analyzed and

output power impulse bursts are sent to the motor.

TMM4 Sensor

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Currier Tech 750 DD Series Service Manual Page 11

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