MG ZS EV ACC fix for use of regen.

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francisco.shi
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Joined: Mon, 17 Sep 2018, 16:30
Real Name: Francisco
Location: Brisbane, Strathpine

MG ZS EV ACC fix for use of regen.

Post by francisco.shi »

It is so annoying when the cruise control uses the brakes to slow down.
I also want one pedal driving.
Oh well it was only a matter of time before it got too much to bear.
🤭

I have been given permission by the big boss to fix this annoying problem.

francisco.shi
Senior Member
Posts: 770
Joined: Mon, 17 Sep 2018, 16:30
Real Name: Francisco
Location: Brisbane, Strathpine

Re: MG ZS EV ACC fix for use of regen.

Post by francisco.shi »

I have been doing a bit of work decoding the inverter communication between the VCU and the motor controller.
Today I finally managed to spoof the torque command.
The first test I did was to half the torque command coming from the VCU. The test was successful and the car drove with half the power.

The next test I carried out was to double the regen braking torque. The result is that KERS level 6 is now available.

There are two CAN buses and the one going to the motor controller does nmot have the ACC or pedal position information.
I will need to order another set of connectors to be able to splice into the wiring harness without cutting wires unwrapping the wire harness.
So it will be a while before I get further.
Barring any stupid design decisions from MG engineers I believe regen on ACC and one pedal driving are within easy reach.
Nagaman
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Real Name: David

Re: MG ZS EV ACC fix for use of regen.

Post by Nagaman »

I’m assuming that the warranty will be voided ?
francisco.shi
Senior Member
Posts: 770
Joined: Mon, 17 Sep 2018, 16:30
Real Name: Francisco
Location: Brisbane, Strathpine

Re: MG ZS EV ACC fix for use of regen.

Post by francisco.shi »

Only if you don't unplug the ad on board when you take it for warranty claims.
I am getting the connectors so it can be installed without modifying the car.
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