adrian_sm wrote:Can you have it just pull the throttle signal down, like a CA throttle override.
Temp < T1: Throttle left alone
T1 < Temp < T2: Throttle is progressively limitted to less than full throttle.
T2 < Temp : Throttle Off.
mr.electric wrote:I would personally enjoy a buzzer and or light for overheat. Another approach would be a two step throttle clamp. Limited current available at the first threshold followed by no throttle for the second higher threshold.
Cars used to have various cut offs so the engine stopped before it was damaged. Later it was decided that stopping the motor was dangerous and confusing. Modern cars always have a light or buzzer but no cut off.
I remember some of the early Vespa sized e scooters had a series of safety interlocks including one where the scooter would not run with the kick stand down. This system caused more harm than good and resulted in a bunch of unsatisfied customers.
I think blinking light and or buzzer would work well and add little complexity and cost. Whatever you decide to do I would buy one of these circuits when they are available.
mr.electric wrote:I Like the key switch board idea very much. It reminds me of the component on a modern car called the gateway ecu. On an ebike the controller is more similar to the engine ecu. A gateway ecu controlls all the communication between the bigger ecus that are dedicated to controlling a large complex system like transmission ,engine or hybrid system. The gateway ecu brings everything together and reads the smart key to authorize the driver to start the car.
I made a nice on/off precharge circuit with Fechter's help. One cool feature was the on/ off sequence. Flip a switch to "on " then press and hold a button to enable now the ready light comes on and you can drive. Precharge starts when you flip the switch to on. The contactor/ relay closes when you press the momentary button. Once you flip it to off it will not accidentally turn on by flipping a little handlebar mounted switch since you still need to press the button to enable. The light reminds you that it is on.
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