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Steering Wheel Sensor

5328 Views 11 Replies 8 Participants Last post by  I-PaceDave
The jaguar build site says this:

"Adaptive Cruise Control with Steering Assist works with you; as you keep your hands on the wheel anticipating the road ahead, the system is designed to assist with steering, braking and acceleration. Should you remove your hands from the wheel, the vehicle will provide a warning. If the warning is not heeded then the Steering Assist is deactivated but the Adaptive Cruise Control remains active."

How does the car know when your hands are on/off the steering wheel? Does it use a torque sensor (like the Teslas) or a capacitive touch sensor (like some other cars) or something else?
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All of the semi-autonomous systems require this, you are still [legally] in control of the car and must keep your hands on it at pretty much all times (it usually allows a few minutes without sensing your hands before alerting you and disabling the system).

It detects this by sensing torque on the wheel.
Some use touch sensors, some use torque sensors, and some use eye sensors (instead of checking for hands on wheel, they try to ensure the driver's attentiveness).

Are you sure that Jaguar is using torque rather than touch sensors? I ask because Tesla drivers seem to find the torque sensors inadequate and annoying - hands are often on wheel but not detected thru torque, leading to incessant nagging reminders.

I'd expect a premium car like the I-Pace to use the more expensive and more reliable capacitive touch sensors to detect hands on wheel. But I have not seen any actual specification or any indication from an early reviewer.
I'm not certain at all, and having owned an AutoPilot Tesla, I agree it's a flawed system and annoying to use.
What is surprising is that nobody at all in the press even mentioned Steering Assist, LKA, or ACC.

I'm going to guess they were not allowed to.
I sent my salesman with a list of technical questions to his recent I-Pace training in Southern California.

The I-Pace is using capacitive touch. However, the sensors are only at the "10" and "2" positions on the steering wheel.
The jaguar build site says this:

"If the warning is not heeded then the Steering Assist is deactivated but the Adaptive Cruise Control remains active."
Not sure I like the sound of that. Car carries on at speed, but stops steering? If I ignored the warning I'm either really really stupid, or I've got a real problem ...

I'm not sure that a Tesla [after getting no response to repeated warnings] slowing to a stop, in lane, with hazard lights on is ideal ... on a busy highway! ... but unless/until the car is able to move over onto shoulder and stop there I think its a reasonable solution.
This system better not suck. I love my wife's AP2 in her Model 3.
You've probably seen it on the TMC iPace thread, but someone posted content from a Twitter feed from @Jim_Holder who was able to borrow one for the weekend and posted some information about his 150 mile journey.
Anybody else concerned that the i-Pace seem to have difficulties reaching it’s claimed range of 240 miles? Reading the Twitter post above he could only get 150 miles or so. Also read another report tonight about a real life range of 269 km (168 miles). And that in perfect weather. In winter, up here in Quebec, this could be drastically reduced..

Really looking forward hearing more about real use range.
I wonder if that (loan) car has been hammered by previous reviewers, meaning that its predicted range algorithm is shot.

Tesla balances the cells if you charge to 100%. I've seen speculation that the 90kWh battery in iPace is actually, say, 100 - so that you can charge to 100% every night, but that's actually only 90% real. I don't know anything about "balancing the cells", maybe that can be done without a 100% charge?, but if that isn't happening maybe it is also skewing the dashboard prediction.

But even if the predicted range algorithm starts off wrong, it ought to be able to say "plenty left" whilst you drive, if the battery isn't getting empty.

I still need a more objective review, someone who logs the wH/mile at various speed, assuming that such information is available. The total for the trip, or any dashboard predictions, are too broad-brush and not a lot of help. I can drive my car like I stole it and fool its prediction algorithm :)
This system better not suck. I love my wife's AP2 in her Model 3.
You can test drive a Nissan Leaf with Pro Pilot, as I understand it is very similar in hardware and capabilities. I found it to work well, but a bit of a novelty. The ACC works excellent.
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