Rally1 hybrid cars (2022-)

[1988senna]

I just wonder what's the disadvantage for the left foot braker. when they use the throttle and the brake at the same time in the 2022 hybrid car??

[1988senna]

There's a difference to using your left foot for braking (while not throttling) and doing the "left-foot-braking" which is used to balance the car to improve turn-in.

From what I've heard from various interviews, Ogier's style is to brake before corner, roll through the corner and apply throttle upon reaching exit angle. Thus there's no simultaneous braking and throttling.

Out of the current drivers Esapekka Lappi seems to be a heavy left-foot-braker, braking lights are alight while turning as well. Remember when he and Ogier were teammates at Citroen, they struggled to find suitable front diff ramps for Esapekka.

Weighing 84kg, Compact Dynamics’ high-performance P3-topology hybrid system accommodates a motor-generator unit (MGU), control unit and battery in a compact housing, thereby delivering maximum power density. The battery for the hybrid system is supplied by Compact Dynamics’ partner, Kreisel Electric, based in Austria.

The unit consists of a 3.9kWh capacity battery pack which is coupled to the MGU, delivering 100kW (134hp) of power and 180Nm of torque during acceleration.
During braking and coasting, the system recuperates energy normally lost and stores it in the battery. If necessary, the battery can also be recharged by an external power supply (plug-in hybrid) during service breaks. To charge from 20 to 80 per cent will take around 20 minutes using the dedicated units.

The MGU, which operates at up to 12,000rpm, the battery, which operates at up to 750 volts, and the inverter control unit are sealed in a carbon fibre housing to resist possible forces and impacts in the event of an accident. The unit is designed to withstand a 70G impact.
https://www.wrc.com/en/news/2021/wrc...inable-future/

how much energy can regen when braking for each corner? and how much energy can be use for each second when driver use the extra power ? is the hybrid power control by another button like the kers button in F1

[WRCStan]

I just wonder what's the disadvantage for the left foot braker. when they use the throttle and the brake at the same time in the 2022 hybrid car??

With regards to hybrid deployment? If they cancel the boost under acceleration using any brake pressure when the battery is less than 80% charged, they lose what boost they could've had and must go through a full regen cycle to get another booster shot (let's agree to ban this term). How much energy they get to use per boost and need to recover for a valid regen cycle is different per rally and is set by the FIA, so what they lose on is unknown now. Regen under braking has a throttle pedal input tolerance of 30% and brake pressure must be above 5 bar pressure. According to Google/Quora, a typical road car is at full lock around 70 bar (or 96 bar power assisted), so how much energy can be micro-recovered this way remains to be seen but I guess insignificant. So much depends on the stage and the rally.

With regards to handling/approach? Others will have the input here. Lack of the active centre differential may encourage it. Things like suspension setup in terms of pitch/roll and brake biases may play with heads. 10 days or so time we'll see to what extent.

[WRCStan]

how much energy can regen when braking for each corner? and how much energy can be use for each second when driver use the extra power ? is the hybrid power control by another button like the kers button in F1

There's no button - they either have it or don't. Probably best to read the previous pages and links to understand why the other questions can't be answered.

[1988senna]

There's a difference to using your left foot for braking (while not throttling) and doing the "left-foot-braking" which is used to balance the car to improve turn-in.

From what I've heard from various interviews, Ogier's style is to brake before corner, roll through the corner and apply throttle upon reaching exit angle. Thus there's no simultaneous braking and throttling.

Out of the current drivers Esapekka Lappi seems to be a heavy left-foot-braker, braking lights are alight while turning as well. Remember when he and Ogier were teammates at Citroen, they struggled to find suitable front diff ramps for Esapekka.

There's no button - they either have it or don't. Probably best to read the previous pages and links to understand why the other questions can't be answered.

the drive can't manually control the hybrid boost right?it's the teams set the maps before the stage and so when driver use the throttle the .the hybrid boost will active automatically?

[1988senna]

Rally1 hybrid system explained by M-Sport:

https://youtu.be/-mbCJecCDr8

I'm not clear by this video for 2 point
1.if there have 80 kilometre with 4 stages to go and no service between the stage. how can the driver make the regen if the 100 KW used out

2.why the driver must use the EV mode .is that mean they will use more electrical energy from the battery? how can they have the advantage

[AnttiL]

I'm not clear by this video for 2 point
1.if there have 80 kilometre with 4 stages to go and no service between the stage. how can the driver make the regen if the 100 KW used out

2.why the driver must use the EV mode .is that mean they will use more electrical energy from the battery? how can they have the advantage

1. The car can regen the battery during the liaison or during the stage through braking
2. EV mode is shutting off the ICE engine in city sections and service park. Advantage? It's positive image.

[AnttiL]

the drive can't manually control the hybrid boost right?it's the teams set the maps before the stage and so when driver use the throttle the .the hybrid boost will active automatically?

Essentially yes. You are always entitled to hybrid boost on the start line. Subsequently you need to brake to regenerate power and recharge the battery to then deploy a new boost.

And the driver can only switch off the hybrid boost for example on an icy section on a Monte stage with slicks.

[Fast Eddie WRC]

So will small dabs of (left-foot) braking to adjust the car be enough to stop the hybrid boost and require another regen cycle or not ?

[AnttiL]

So will small dabs of (left-foot) braking to adjust the car be enough to stop the hybrid boost and require another regen cycle or not ?

Likely yes