4 ms·

The receiver which measures the voltage pattern and decides if the rest of the voltage is allowed or not becomes the weak point. Like the encrypted key system u

The receiver which measures the voltage pattern and decides if the rest of the voltage is allowed or not becomes the weak point. Like the encrypted key system used today, this could be buried deep inside the engine, but unclear why this is better than keys today. In addition, if the driver should be able to manually recreate the voltage pattern by actually flicking the lights/wipers, there will be a relatively small number of voltage combinations which could be iterated through an automated device connected directly to the wires very quickly.

hulitu 3y ago
Plus DOS when the battery is exhausted after a couple of "turn lights on off, turn wipers on off".
- talldatethrow 3y ago
  You could flash headlights probably 500+ times before a healthy battery had even a little trouble starting.
  - Brusco_RF 3y ago
    We're considering the entire battery lifecycle. So the correct way to think about this change is: More energy required to start engine --> Minimum battery health required to start engine increases --> battery lifecycle decreases.
    - talldatethrow 3y ago
      I don't see how this could possibly reduce the battery lifespan. Flashing the lights takes a few watts. The vehicle will then be started and charged and never reach any lower level of discharge where damage would occur. Yes, if you flashed your lights everytime 500+ times and got your battery to a meaningful low voltage where it barely started every time, sure. But not in the use case presented here.
      - Brusco_RF 3y ago
        Consider two cars with fading batteries at the end of their lifecycles. They are on their last start before needing to be replaced. They both have exactly enough energy to start the car with nothing left over, however one car has this system installed so it needs to flash the headlights/wipers/windows first. That car fails to start
        talldatethrow 3y ago
        That's like saying we should also turn off keyless entry sensors to make our battery last an extra day too, since theyr draining power as your car sits all weekend, and then one Monday morning your car won't start when you need to go to work. Does it really matter if your car starts 3000 times from a battery or 3001 times?

hulitu 3y ago

Plus DOS when the battery is exhausted after a couple of "turn lights on off, turn wipers on off".

talldatethrow 3y ago
You could flash headlights probably 500+ times before a healthy battery had even a little trouble starting.
- Brusco_RF 3y ago
  We're considering the entire battery lifecycle. So the correct way to think about this change is: More energy required to start engine --> Minimum battery health required to start engine increases --> battery lifecycle decreases.
  - talldatethrow 3y ago
    I don't see how this could possibly reduce the battery lifespan. Flashing the lights takes a few watts. The vehicle will then be started and charged and never reach any lower level of discharge where damage would occur. Yes, if you flashed your lights everytime 500+ times and got your battery to a meaningful low voltage where it barely started every time, sure. But not in the use case presented here.
    - Brusco_RF 3y ago
      Consider two cars with fading batteries at the end of their lifecycles. They are on their last start before needing to be replaced. They both have exactly enough energy to start the car with nothing left over, however one car has this system installed so it needs to flash the headlights/wipers/windows first. That car fails to start
      - talldatethrow 3y ago
        That's like saying we should also turn off keyless entry sensors to make our battery last an extra day too, since theyr draining power as your car sits all weekend, and then one Monday morning your car won't start when you need to go to work. Does it really matter if your car starts 3000 times from a battery or 3001 times?