Results 481 to 490 of 717
Thread: Rally1 hybrid cars (2022-)
-
12th January 2022, 20:58 #481
- Join Date
- Jun 2007
- Location
- Prague / Eastern Bohemia
- Posts
- 22,505
- Like
- 7,830
- Liked 11,151 Times in 4,427 Posts
Man, please aducate yourself in basic physics. Your questions make no sense whatsoever.
First kW or Hp is NOT a unit of energy. It is a unit of power which is a different thing. Power is a quantity used to describe energy flow per unit of time.
The energy is described by joule or Wh (power multiplied by time). In this case the energy is 3,9 kWh which means that the battery is large enough to give the car 3,9 kW steady power for 1 hour, or 234 kW for one minute. That is of course without any recuperation, i.e. recharging by braking power.
The extra power the WRC system can deliver is 100 kW. Now divide 3,9 kWh by 100 kW and you get that the battery capacity is enough for 2,5 minutes of full boost. For city cruising on the road section it can be likely around 3x more.
But of course the recuperation adds a lot of energy. We don't know what recharging power can be used in WRC cars but a heavy braking produces much higher power than the extra boost, which means that the time spend on braking to recharge the energy is not long.Stupid is as stupid does. Forrest Gump
- Likes: jcevc (12th January 2022),WRC1 (13th January 2022)
-
12th January 2022, 23:48 #482
- Join Date
- Jul 2019
- Posts
- 131
- Like
- 0
- Liked 5 Times in 5 Posts
thanks for explain .I really misunderstand the kW and the kWh. if it's 80% of the total capacity always .then the really capacity is 3.12kWh right?
I see some artical said the driver can make the regen to let the battery up to 80% during the road section .so that it can be ready for next stage.but if there have not enough length road section or not enough time for regen to back to 80%.what could the driver do
and for the boost time. the 3.9kWh can boost for 2.5 minutes with 100kw .so if there have the long long straight during the stage.will the driver make the boost as long as possible or they will touch the brake to end boost to save the energy
will the team reduce the each boost power less than 100kw(90kw 80kw ) for the long stage like 40km with more long straight stage in FinlandLast edited by 1988senna; 13th January 2022 at 00:29.
-
13th January 2022, 01:34 #483
- Join Date
- Oct 2021
- Posts
- 1,076
- Like
- 534
- Liked 611 Times in 325 Posts
The battery capability goes down with energy use and back up with energy regeneration/recovery through braking.
Energy is measured in joules
Power is a rate of flow measured in Watts, 1 watt = 1 joule/second
(1kw = 1000w, 1kj = 1000j)
Capacity is useful when using time instead of maths with joules - so Kilowatt hours. As in, that battery will offer *kw for 1 hour at *kwh.
This battery:
3.9kwh rated capacity
3900wh
3900j/s for an hour
234,000j/s for a minute
14,040,000j/s for a second
14,040kj energy when full or at capacity
FIA rule of Launch Boost limit of 1000kj is known
100KW rated max power consumption of the propulsion motor
100kj/s
1000kj / 100kj/s = max 10 seconds (as seen noted in various places)
1000kj = max 7.1% battery capacity used at launch
I see some artical said the driver can make the regen to let the battery up to 80% during the road section .so that it can be ready for next stage.but if there have not enough length road section or not enough time for regen to back to 80%.what could the driver do
and for the boost time. the 3.9kWh can boost for 2.5 minutes with 100kw .so if there have the long long straight during the stage.will the driver make the boost as long as possible or they will touch the brake to end boost to save the energy
will the team reduce the each boost power less than 100kw(90kw 80kw ) for the long stage like 40km with more long straight stage in FinlandLast edited by WRCStan; 13th January 2022 at 02:06. Reason: Fool
- Likes: drive (13th January 2022),Mirek (13th January 2022)
-
13th January 2022, 04:03 #484
- Join Date
- Jul 2019
- Posts
- 131
- Like
- 0
- Liked 5 Times in 5 Posts
thanks for your details explain
so from my understanding the each boost power is the same 100 kw no matter what stage .but the each boost time should be decide by the FIA for different stage (like 6 seconds for short stage and
3 seconds for longer stage unless take the brake earlier ),but I believe each boost time can't be longer than 10 seconds
-
13th January 2022, 04:54 #485
- Join Date
- Oct 2000
- Posts
- 8,821
- Like
- 2,088
- Liked 2,242 Times in 1,200 Posts
I guess the ‘less-aero’ rules only apply to the front of the new cars? They all seem to have picnic tables attached to the rear hatch still..
-
13th January 2022, 06:21 #486
- Join Date
- Feb 2003
- Location
- Estonia
- Posts
- 1,862
- Like
- 140
- Liked 1,093 Times in 491 Posts
- Likes: Mirek (13th January 2022),pantealex (13th January 2022),RS (13th January 2022),Sulland (13th January 2022)
-
13th January 2022, 11:37 #487
- Join Date
- Aug 2011
- Posts
- 1,950
- Like
- 1
- Liked 1,131 Times in 605 Posts
-
13th January 2022, 12:59 #488
- Join Date
- Jan 2013
- Posts
- 354
- Like
- 136
- Liked 237 Times in 112 Posts
and no more vents to extract air from the wheel arches (cd decks) in the rear of wheel arches
-
13th January 2022, 17:40 #489
- Join Date
- Mar 2010
- Location
- England
- Posts
- 18,893
- Like
- 3,429
- Liked 9,356 Times in 4,971 Posts
Re the regen by braking...
When a driver brakes sufficiently hard does the regen system then activate to slow the car, partially slow the car, or do the brakes & pads still do all the stopping ?
-
13th January 2022, 17:45 #490
- Likes: pantealex (17th January 2022)
Rallying is about following the route, if the route says go round a pole, you go round the pole. If you want to carve you're own path, go baja or something.
[WRC] Croatia Rally 2024