Author Topic: My Jazz SR arrived yesterday  (Read 846 times)

olduser1

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Re: My Jazz SR arrived yesterday
« Reply #15 on: July 09, 2020, 06:05:05 PM »
Maybe as well to do the old fill to fill over a month or so of mixed driving then check mpg.

csp

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Re: My Jazz SR arrived yesterday
« Reply #16 on: Today at 10:58:28 AM »
I suspect that the engine will run in cold weather to provide heating, the manual implies that the system may take longer to initialise in very cold weather  (see attachment), I also suspect that in cold weather the range in EV mode would be reduced so the engine would run more.


« Last Edit: Today at 11:00:52 AM by csp »

John Ratsey

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Re: My Jazz SR arrived yesterday
« Reply #17 on: Today at 11:50:39 AM »
My dealer sent me a link to this introductory video: Honda UK have prepared it because social distancing requirements prevent the salesman from sitting in the vehicle with the customer and explaining the controls.

At about 2m 55s there's a comment explaining that whether or not the engine starts when the vehicle is first powered up depends on both the state of battery charge (I presume he means the HV battery) and the temperature both inside and outside the vehicle. This, I deduce, means that the engine is needed for both heating and cooling. The handbook explains that enabling Econ mode allows greater temperature fluctuations (ie the vehicle will tolerate a bigger temperature difference between target and actual temperature before the engine gets started).

I'm a little surprised that, given all the technology packed under the bonnet, Honda didn't include an inverter controlled electrical aircon / heat pump. They must have one in the parts store for the Honda e but perhaps they were worried by the prospect of people sitting in the vehicle for sustained periods, going nowhere but draining the battery.

Muldoon

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Re: My Jazz SR arrived yesterday
« Reply #18 on: Today at 12:10:13 PM »
I suspect that the engine will run in cold weather to provide heating, the manual implies that the system may take longer to initialise in very cold weather  (see attachment), I also suspect that in cold weather the range in EV mode would be reduced so the engine would run more.

Thanks for this, an interesting detail. It does say you can't drive off until conditions improve, I wonder for how long? If it is minus 8 and thick ice on the car it may prevent you driving off until certain levels and readings comply. Suppose you can defrost and scrape off the ice whilst the car initialises? I don't think the new Jazz has a heated windscreen.

Muldoon

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Re: My Jazz SR arrived yesterday
« Reply #19 on: Today at 12:12:05 PM »
My dealer sent me a link to this introductory video: Honda UK have prepared it because social distancing requirements prevent the salesman from sitting in the vehicle with the customer and explaining the controls.

At about 2m 55s there's a comment explaining that whether or not the engine starts when the vehicle is first powered up depends on both the state of battery charge (I presume he means the HV battery) and the temperature both inside and outside the vehicle. This, I deduce, means that the engine is needed for both heating and cooling. The handbook explains that enabling Econ mode allows greater temperature fluctuations (ie the vehicle will tolerate a bigger temperature difference between target and actual temperature before the engine gets started).

I'm a little surprised that, given all the technology packed under the bonnet, Honda didn't include an inverter controlled electrical aircon / heat pump. They must have one in the parts store for the Honda e but perhaps they were worried by the prospect of people sitting in the vehicle for sustained periods, going nowhere but draining the battery.

Thanks for this John, very interesting. There is a lot going on under the bonnet with competing systems and sensors, it does suggest a delay to driving if it is very cold.

Jocko

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Re: My Jazz SR arrived yesterday
« Reply #20 on: Today at 02:10:33 PM »
I'm a little surprised that, given all the technology packed under the bonnet, Honda didn't include an inverter controlled electrical aircon / heat pump. They must have one in the parts store for the Honda e but perhaps they were worried by the prospect of people sitting in the vehicle for sustained periods, going nowhere but draining the battery.
The difference in battery capacity is HUGE between the Jazz and the Honda-e (even though the Honda-e is small compared with the Kona, Niro and Tesla). It is not surprising that the engine has to run to provide heating and cooling. If you are happy to suffer, you can use the Econ mode, just as in an EV you can wrap up warm and do without cabin heating (seat heaters appear to be a more energy-efficient means of keeping warm in an EV).
The bit about "the manual implies that the system may take longer to initialise in very cold weather" is worrying, if the car won't start in extremely low temperatures.

John Ratsey

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Re: My Jazz SR arrived yesterday
« Reply #21 on: Today at 04:11:01 PM »
The bit about "the manual implies that the system may take longer to initialise in very cold weather" is worrying, if the car won't start in extremely low temperatures.
How cold is "very cold"? I guess somewhere like -20C as Honda are selling the same vehicle all over Europe and many countries have colder winters than we get. Even if "very cold" is as high as -10C I'm very unlikely to be venturing outside but maybe it's a more common occurrence for you folk who live near the Arctic circle ;D .

A heat pump typically produces 4 x more heat than it uses as energy so a 0.5kW heat pump could provide 2kW of heating. A few minutes fill-in warmth from battery power would avoid the cold engine idling when waiting at traffic lights or junctions and cold engines are bad for the mpg. If the engine only has to run when it's actually delivering power then it will warm up faster (perhaps Honda has configured the vehicle so that the engine does a bit of work topping up the battery). We'll find out next winter.

Jocko

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Re: My Jazz SR arrived yesterday
« Reply #22 on: Today at 07:07:21 PM »
A heat pump typically produces 4 x more heat than it uses as energy so a 0.5kW heat pump could provide 2kW of heating.
These figures are for a "Ground Source Heat Pump" so unless you bury the car in the ground, I cannot see how you can get that amount of energy. EV heat pumps use the heat from the battery to heat the cabin. I very much doubt a Hybrid battery would develop enough heat to make a heat pump viable.
However, I am sure Honda has made cabin heating effective. After all, Japan has bitterly cold winters (Winter Olympics).

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