will not accelerate on Motorway slight incline

[Lincolnshire Rambler]

Yes the big german 2 litre diesels do get a surprise by hiw quick the jazz can be out of a roundabout…😆

[GeoffW]

I've not particularly noticed any lack of power when accelerating on an incline at 65/70mph. Without reading all the posts in this thread in detail, I don't think anyone has mentioned that at about 65mph the petrol engine drives the road wheels directly with a fixed gear ratio. (Like driving a conventional petrol engined car in top gear). If you accelerate at this speed the electric motor will add power to the transmission as needed to help deliver more power to the wheels.

This video explains it all very well:

There are other videos which also explain it.

[ColinB]

If you accelerate at this speed the electric motor will add power to the transmission as needed to help deliver more power to the wheels.

Provided, of course, that the battery has sufficient stored energy to provide that power boost, and even if it does it won't do it for long. So it's entirely possible that there are circumstances in which the car won't accelerate, as reported by other owners.

[shufty]

If you accelerate at this speed the electric motor will add power to the transmission as needed to help deliver more power to the wheels.

Provided, of course, that the battery has sufficient stored energy to provide that power boost, and even if it does it won't do it for long. So it's entirely possible that there are circumstances in which the car won't accelerate, as reported by other owners.

 

[PaultheManc]

Provided, of course, that the battery has sufficient stored energy to provide that power boost, and even if it does it won't do it for long. So it's entirely possible that there are circumstances in which the car won't accelerate, as reported by other owners.

That's not my understanding.  I believe maximum power is achieved by the electric motors alone, with the ICE going to higher revs to deliver maximum generated electric power to the electric drive motors.  I believe the ICE is used for direct drive via the clutch at a select range of conditions which optimise efficiency.

[PaultheManc]

Just reviewed a Honda technical presentation on the eHev system.

Between 50 and 75mph a Jazz uses direct ICE drive about 73% of the time. Below, mainly EV drive and above EV drive.

Interestingly it states the generator motor is 70Kw whilst the drive motor is 80Kw, so it would seem that to get maximum drive power some battery energy must be available.

[ahavoja]

Interestingly it states the generator motor is 70Kw whilst the drive motor is 80Kw, so it would seem that to get maximum drive power some battery energy must be available.

I also think that's how it works, based on the numbers.

at about 65mph the petrol engine drives the road wheels directly with a fixed gear ratio. (Like driving a conventional petrol engined car in top gear). If you accelerate at this speed the electric motor will add power to the transmission as needed to help deliver more power to the wheels.

Yes, if you accelerate gently. But if you froor the pedal, then the fixed gear ratio between the petrol engine and the wheels disengages, and the engine revs up, so that it could generate maximum electricity, which the drive motor then uses to spin the front wheels.

[Lincolnshire Rambler]

The clever part is that the power control can instruct the petrol engine to spin up to whatever rpm is required . Floor the accelerator and it will go to the rev limitor within a second or so , you dont have to wait for revs to build as you accelerate through the gears . Almost instant full petrol engine power available to genreate the electrical power .  Also the modest sized HV battery can add quite a few kW for  a few seconds ( and others may add their better knowledge ) id guess it could add 20 to 30kW if needed for 10 /15 seconds ?

[ahavoja]

Looking at another thread https://clubjazz.org/forum/index.php?topic=13799.msg107929#msg107929
our Jazz may be using these battery cells https://www.yuasa.co.uk/2016/05/2629/


Let's do some math...
48 cells * 3.6V per cell * 300A maximum current = 52 kW
So the battery could output a maximum power of 52 kW, but that's just the maximum allowed by battery manufacturer, and I don't think Jazz uses that much power from the HV battery.

If Jazz would use that much power from the battery, it would fully deplete the battery in just 60 seconds, even if the battery was fully charged to 100%:
5Ah / 300A * 3600 seconds/hour = 60 seconds.

But that's just the maximum. I guess Lincolnshire Rambler's guess in the post above is closer to what actually happens.

[Mr Onion]

I've not particularly noticed any lack of power when accelerating on an incline at 65/70mph. Without reading all the posts in this thread in detail, I don't think anyone has mentioned that at about 65mph the petrol engine drives the road wheels directly with a fixed gear ratio. (Like driving a conventional petrol engined car in top gear). If you accelerate at this speed the electric motor will add power to the transmission as needed to help deliver more power to the wheels.

This video explains it all very well:

There are other videos which also explain it.

Thanks for linking the video, I have finally got my head around the transmission

[Tox Laximus]

You should be out pulling AMG's (250 BHP) uphill, I noticed the new Jazz had a very special drivetrain during a test drive in 2020, it can dump all it's power to the road in an instant, it can play with the big boys.

As usual a video to back this up, driver is not me BTW.

[Tombola]

You should be out pulling AMG's (250 BHP) uphill, I noticed the new Jazz had a very special drivetrain during a test drive in 2020, it can dump all it's power to the road in an instant, it can play with the big boys.

As usual a video to back this up, driver is not me BTW.

IMO if that was a 3 or4 lane motorway the Jazz would have been left standing, not sure if it's a BMW or a Merc, Jazz driver stupidly tried an undertake and failed so resorted to an equally stupid overtake just to make a point

[shufty]

...What a plonker! 

[Tombola]

...What a plonker! 

Who's the plonker, me or the Jazz driver 

[Tox Laximus]

You should be out pulling AMG's (250 BHP) uphill, I noticed the new Jazz had a very special drivetrain during a test drive in 2020, it can dump all it's power to the road in an instant, it can play with the big boys.

As usual a video to back this up, driver is not me BTW.

IMO if that was a 3 or4 lane motorway the Jazz would have been left standing, not sure if it's a BMW or a Merc, Jazz driver stupidly tried an undertake and failed so resorted to an equally stupid overtake just to make a point

With the Jazz's brakes and handling its relatively safe to do that, uphill at the start Hugo Splat had to back off because the lag of a petrol only engine and this lag can be seen during the attempted undertake but 250 bhp AMD is too much for the Jazz but never say die because the rich detest being beat by pleb in a Honda.

And remember two wrongs make a splat - Hugo Splat.