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wait so many normal cars now have steering motors that you can actuate via OBD?? Is that just leveraging the lane keep assist feature on these modern cars? How

wait so many normal cars now have steering motors that you can actuate via OBD?? Is that just leveraging the lane keep assist feature on these modern cars? How much can that hardware steer for you?

qbasic_forever 6y ago
Since the early 2000's most cars have been using a drive-by-wire system for steering. They aren't exposed on OBD2 though, that's just for legacy emissions. Most are on a CAN bus but there isn't some big standard to control them all--it's very much a manufacturer by manufacturer thing right now.
- bri3d 6y ago
  This is only partially true - the only cars which used "real" drive-by-wire (wheel -> computer -> steering actuator) were a few Infiniti vehicles, and even then they had a clutch which could re-engage a physical steering column. Rather, a few cars in the early 2000s and many since the early 2010s or so offer electric power steering assist: the steering wheel is still very much connected by a physical steering column to the steering rack, and normal steering input is purely physical - there's just also an electric motor attached to the rack to provide the usual power steering boost. And, that power steering assist can be controlled over a non-diagnostic CAN bus to facilitate LKA.
bri3d 6y ago
Yes, this is usually leveraging the LKA feature. Depending on the manufacturer/car the LKA generally has a torque limit (to allow the driver to override the system by hand, and prevent wrist injuries from steering input) and an angle limit. Most cars (none, that I am aware of) do not allow the steering motor to be actuated over the OBD port, the CAN bus containing the steering/LKA sits behind a diagnostic gateway that doesn't pass steering messages. You need to tap into this CAN bus, which in the Comma product is accomplished by the connector at the rearview mirror (usually used for the stock lane-keeping assist camera).
chrisseaton 6y ago
Most modern cars have something like lane assist yes, which moves the steering wheel for you. Many have automatic parking which also moves the wheel. So yeah it's built in anyway.

wait so many normal cars now have steering motors that you can actuate via OBD?? Is that just leveraging the lane keep assist feature on these modern cars? How much can that hardware steer for you?

qbasic_forever 6y ago

Since the early 2000's most cars have been using a drive-by-wire system for steering. They aren't exposed on OBD2 though, that's just for legacy emissions. Most are on a CAN bus but there isn't some big standard to control them all--it's very much a manufacturer by manufacturer thing right now.

bri3d 6y ago
This is only partially true - the only cars which used "real" drive-by-wire (wheel -> computer -> steering actuator) were a few Infiniti vehicles, and even then they had a clutch which could re-engage a physical steering column. Rather, a few cars in the early 2000s and many since the early 2010s or so offer electric power steering assist: the steering wheel is still very much connected by a physical steering column to the steering rack, and normal steering input is purely physical - there's just also an electric motor attached to the rack to provide the usual power steering boost. And, that power steering assist can be controlled over a non-diagnostic CAN bus to facilitate LKA.

bri3d 6y ago

Yes, this is usually leveraging the LKA feature. Depending on the manufacturer/car the LKA generally has a torque limit (to allow the driver to override the system by hand, and prevent wrist injuries from steering input) and an angle limit. Most cars (none, that I am aware of) do not allow the steering motor to be actuated over the OBD port, the CAN bus containing the steering/LKA sits behind a diagnostic gateway that doesn't pass steering messages. You need to tap into this CAN bus, which in the Comma product is accomplished by the connector at the rearview mirror (usually used for the stock lane-keeping assist camera).

chrisseaton 6y ago

Most modern cars have something like lane assist yes, which moves the steering wheel for you. Many have automatic parking which also moves the wheel. So yeah it's built in anyway.