Abusing the TJA.

[siteguru]

Never used TJA either !! ... will give it a try instead of ACC.

Not keen on ACC particularly, as I find it slows down the car on slight bends even on the A1 !

The recent software updates seem to have improved that greatly. I used to get the same effect on the M8 but now it continues to drive through the bends - it is only tighter bends where the speed reduces. (I think the reduction is related to a function of current speed and steering angle, and the update has moderated that effect).

 

[M101]

I dont use either because they dont work very well and i would never trust my life to a p155 poor system that looks thrown on at the last minute to tick an EU box

 

[rogerl]

I use ACC any time I'm on a dual carriageway or motorway. I've tried TJA a few times but I think a drunk driver has a better chance of keeping the car between the lines. It either drifts towards the line and then makes a strong correction to move away from it, or it will randomly just drift over the line, either into the next lane or off the road. When holding the steering wheel, it's constantly fighting you if you want to take over and so you end up overcorrecting when it does disengage.

On my Mokka, I could, and did use steering assist all the time on a dual carriageway. It kept the car centered in the lane fairly well and it let you take control smoothly, with no fuss. It was night & day compared to the MG.

The car is in for some other work and they are assuring me that they are doing a full system update so I'll see what comes back

 

[M101]

I bought my wife a 2018 leaf and the LKA on that is perfect, the car sits in the centre of the lane at all times and i trust it. I also had a Kia Niro for a day and that was the same, i even tried iLKA on a windy country road, and it managed to take all the bends without wandering which shocked me. So MG have fitted the cheapest nastiest system in the world and done NOTHING to fix it
Dont hold your breath for updates fixing these bugs. Mine was updated in November when it had its 1 year service and they said it should fix most issues, but it did nothing.
Its little things like this that have convinced me not to get another MG after i hand mine back in 3 years.

 

[Loveclose]

I tried TJA on my Long Range Trophy for the first time this week, having owned the car just over a fortnight.
I hit a slow moving, start- stop scenario, so I set the TJA to 20mph and head my breath.
It worked superbly.
From my chair, it was way easy better than my previous Qashqai Teckna+ which wasn't a bad car at all.
I'm not sure if it's that mode at 70mph or so. I find the standard adaptive cruise control perfectly OK. In my opinion, I suspect the TJA works best in the scenario it was designed for.....

 

[Bricktop X PWR]

I tried TJA on my Long Range Trophy for the first time this week, having owned the car just over a fortnight.
I hit a slow moving, start- stop scenario, so I set the TJA to 20mph and head my breath.
It worked superbly.
From my chair, it was way easy better than my previous Qashqai Teckna+ which wasn't a bad car at all.
I'm not sure if it's that mode at 70mph or so. I find the standard adaptive cruise control perfectly OK. In my opinion, I suspect the TJA works best in the scenario it was designed for.....

Yes, nothing I hadn't already said in the OP, but ACC won't steer your car.

 

[M101]

I tried TJA on my Long Range Trophy for the first time this week, having owned the car just over a fortnight.
I hit a slow moving, start- stop scenario, so I set the TJA to 20mph and head my breath.
It worked superbly.
From my chair, it was way easy better than my previous Qashqai Teckna+ which wasn't a bad car at all.
I'm not sure if it's that mode at 70mph or so. I find the standard adaptive cruise control perfectly OK. In my opinion, I suspect the TJA works best in the scenario it was designed for.....

Keep thinking this, but you are going to have a moment where the car does something stupid like turning you in to on coming traffic when it gets confused. Or when you try to avoid a pothole and the car yanks the steering wheel back in its direction.
I turn this system off every time i get in the car because its terrible and dangerous.
I have never once relied on in because im not idiot and im more than capable of driving a car using my own senses and reactions.

My opinion of the MG4 is, the mechanics of the car are not bad , but the tech is dog shit!

 

[JeffMcC75]

I regularly use TJA on my motorway runs which are around 30 miles, apart from moving lanes to overtake someone really slow the car drives the whole way uninterupted. I guess the road markings are very clear on that section of motorway so that probably helps it, but even at night when the road marking are only lit by the headlamps it still works perfectly. I havent had any jerks or lurches on the motorway, but it can have some wobbles on B roads where markings arent as clear.

Its amazing techonology but far away from completely autonomous driving that some Teslas can do in the states.

LKA is a very different thing from TJA even though it must be using the same algorithm, I switch it off everytime I get in the car. I'll complain when I take it for service next month to see if they'll update the software

 

[Bricktop X PWR]

I regularly use TJA on my motorway runs which are around 30 miles, apart from moving lanes to overtake someone really slow the car drives the whole way uninterupted. I guess the road markings are very clear on that section of motorway so that probably helps it, but even at night when the road marking are only lit by the headlamps it still works perfectly. I havent had any jerks or lurches on the motorway, but it can have some wobbles on B roads where markings arent as clear.

Its amazing techonology but far away from completely autonomous driving that some Teslas can do in the states.

LKA is a very different thing from TJA even though it must be using the same algorithm, I switch it off everytime I get in the car. I'll complain when I take it for service next month to see if they'll update the software

For the avoidence of doubt to the naysayers, we are all capable of driving the cars ourselves.
I myself have been at the wheel since 1985. Quite capable, last time I looked.

Yes Jeff, I agree, it's not perfect.
My Model3 used to throw its toys out of the pram from time to time.

The first time I let the Tesla drive was very exciting! Just like something out of a SciFi movie.

The tech is deeply impressive, if still not 100% just yet.

I'm sure all manufacturers will get there in the not too distant future.

We've (others, not me. Far too fik?) put men on the moon and had supersonic aviation for a time.

Driverless vehicles should be a doddle.

I reckon in 5 years or less there will be driverless taxis roaming around the streets.
It's all being tested right now in different parts of the world.

I would happily have a go in one.

LKA is switched off when I first get in the car.
It's still a bit 'beepy' because our B roads have no markings.
It hasn't ever had it try to kill me though.
Just a slight nudge on the wheel is all.

 

[salty]

I reckon in 5 years or less there will be driverless taxi's roaming around the streets.

The way I've seen, some Taxis driving along, it's a though they are Driverless now.

 

[Rolfe]

I'm getting hellish tempted to go for a motorway spin just to try this out now.

 

[Loveclose]

Keep thinking this, but you are going to have a moment where the car does something stupid like turning you in to on coming traffic when it gets confused. Or when you try to avoid a pothole and the car yanks the steering wheel back in its direction.
I turn this system off every time i get in the car because its terrible and dangerous.
I have never once relied on in because im not idiot and im more than capable of driving a car using my own senses and reactions.

My opinion of the MG4 is, the mechanics of the car are not bad , but the tech is dog shit!

I've not probably driven the MG4 anywhere near the same as anyone here, but to date, none of my Lane Management 'adjustments' have been at all violent.

I'd also discriminate between Adaptive Cruise Control and Traffic Jam Assist - I wouldn't want to initialise the TJA at 70mph. Using ACC is perfectly ok for me at that speed.

Happy Days.....

 

[Anon70]

Tried TJA once but the car was way to fidgety moving around in its lane when not required then getting close to the white lines for no reason so just went old school and turned it off.

 

[M101]

Tried TJA once but the car was way to fidgety moving around in its lane when not required then getting close to the white lines for no reason so just went old school and turned it off.

The LKA on mine is so bad that it looks like a kid bowling with the bumper bars up because it wanders around the lane so much.

 

[Bricktop X PWR]

The LKA on mine is so bad that it looks like a kid bowling with the bumper bars up because it wanders around the lane so much.

Do you mean TJA m8?

My LKA will interfere, but usually just the one light tug on the wheel.

I'm looking forward to my update next week.

Do you know what version of software you are on?

 

[M101]

Do you mean TJA m8?

My LKA will interfere, but usually just the one light tug on the wheel.

I'm looking forward to my update next week.

Do you know what version of software you are on?

TJA is just Lane keep assist (LKA) and adaptive cruise control (ACC) together.
The cruise control is not dangerous because it works, its just not as smooth as it should be, but the LKA is very dangerous because it doesn't work very well, it struggles to stay in the middle of the lane and if you are really lucky it just ignores the white lines and takes you on a path towards death and destruction.

I've no idea what version im on but it was updated in November when it was service but nothing changed.

 

[Bricktop X PWR]

TJA is just Lane keep assist (LKA) and adaptive cruise control (ACC) together.
The cruise control is not dangerous because it works, its just not as smooth as it should be, but the LKA is very dangerous because it doesn't work very well, it struggles to stay in the middle of the lane and if you are really lucky it just ignores the white lines and takes you on a path towards death and destruction.

I've no idea what version im on but it was updated in November when it was service but nothing changed.

OK, so that's your experience.

Granted, others seem to have suffered the same fate.

My original post was bigging up the TJA as it works for me, and above the speeds for which it was designed.

So I will agree to disagree.

It works well for me.

It tries to kill you.

Goodnight Irene.













Someone else can point out who Irene is.

Something to do with Peter Kay I think. ?

 

[siteguru]

The commentators for MMA often say that when there's a knockout.

As to TJA = ACC + LKA ... no. TJA (Supposedly) tries* to keep you central in the lane, whereas LKA tries to keep you IN the lane.

* I don't like TJA either, nor LKA. I find TJA a bit twitchy, and whilst it works OK most of the time, sometimes it can get a mind of its own and try to steer me into a hazard. ?‍

 

[M101]

i think its actually the experience of most people who drive an MG4, including most motoring journalists who have them on long tests, so if you think its good then you are one hell of a lucky person who got a fully functioning car or your idea of good is not the same as most people

 

[Bricktop X PWR]

i think its actually the experience of most people who drive an MG4, including most motoring journalists who have them on long tests, so if you think its good then you are one hell of a lucky person who got a fully functioning car or your idea of good is not the same as most people

I am not most people.
I am Ex Military.
And I seem to have a fully functioning car.

Now to be clear, I am agreeing to disagree.