Torque Sensors for car. To control Electric assist.

[Logic]

E-bikes often come with a torque sensor in the crankset that feeds a signal to the motor controller where the user can then choose the amount of pedal assist they desire.

These systems can be/are overridden by a std electric bicycle brake style throttle that could easily be integrated with the std foot throttle control in a car.

IMHO this is the easiest method of getting a DIY electric assist system to work with a ICE powered vehicle.

The sticking point for me has been the lack of 'bolt on' torque sensor.
These guys seem to have all the bases covered:

• Engine
• Transmission
• Driveshaft
• Transfer case
• Differential

https://www.methodesensor.com/indust...orque-sensing/

Some Others:
https://binsfeld.com/torquetrak/markets/automotive/
https://binsfeld.com//shaft-strain-gaging-guide


https://melectric-systems.de/en/prod...%20Gelenkwelle
Amongst other things,
THE DRIVE SHAFT SYSTEM IS USED FOR:

• Evaluation of the aerodynamic efficiency of the vehicle
• The effectiveness of aerodynamic setup changes (e.g. roll-out tests, straight-ahead tests)

I hadn't considered that!
Then again, the supplier hasn't considered motor control.

[Piotrsko]

Some success with a sine/cosine sensor on the output shaft, but thats 20 year ago tech. The stuff I see today reads the lag angle directly from the power magnets via current sensing. Does require motor qualification during setup and tricky programming.

[Logic]

Originally Posted by Piotrsko

Some success with a sine/cosine sensor on the output shaft, but thats 20 year ago tech. The stuff I see today reads the lag angle directly from the power magnets via current sensing. Does require motor qualification during setup and tricky programming.

Ok, but for this idea you have a std ICE supplying torque to the wheels via driveshafts.
You want to measure that mechanical torque and tell an electric motor, supplementing the engine, to supply some % of the number read by the sensor.

ie: You don't want to sense the torque supplied by the motor but that supplied by the engine that is under your direct (foot) control.

The E-bike sensors look like this: