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China patent leak may show BMW hydrogen fuel cell car

A series of leaked patent renderings has revealed what Car News China claims is a new BMW hydrogen fuel cell concept slated to debut in a few weeks time at the 2015 Los Angeles Auto Show. Likely set to be a member of the company's i sub-brand, this compact three-door looks like the love-child of the ultra-efficient manufacturers i3 electric car and i8 hybrid sports car. It's narrow, boasting a cab-forward design and an aggressive interpretation of the company's current front end styling. The rear is angular and taut, and the entire car features an aerodynamic teardrop shape. Despite modern styling elements, like the headlights and grille, CNC rightly points out that there's something inescapably "1990-concept-car-ish" about this vehicle's look. We can't quite put our finger on it, but it's there. We won't have long to wait to see if these patent renderings are real. The 2015 Los Angeles Auto Show kicks off on Wednesday, November 18. You can check out the rest of the patent renderings over at Car News China. Related Video: The video meant to be presented here is no longer available. Sorry for the inconvenience.

Is the skill of rev matching being lost to computers?

If the ability to drive a vehicle equipped with a manual gearbox is becoming a lost art, then the skill of being able to match revs on downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. The usefulness of rev matching in street driving is limited most of the time – aside from sounding cool and impressing your friends. But out on a race track or the occasional fast, windy road, its benefits are abundantly clear. While in motion, the engine speed and wheel speed of a vehicle with a manual transmission are kept in sync when the clutch is engaged (i.e. when the clutch pedal is not being pressed down). However, when changing gear, that mechanical link is severed briefly, and the synchronization between the motor and wheels is broken. When upshifting during acceleration, this isn't much of an issue, as there's typically not a huge disparity between engine speed and wheel speed as a car accelerates. Rev-matching downshifts is the stuff they would teach at the automotive equivalent of the Shaolin Temple. But when slowing down and downshifting – as you might do when approaching a corner at a high rate of speed – that gap of time caused by the disengagement of the clutch from the engine causes the revs to drop. Without bringing up the revs somehow to help the engine speed match the wheel speed in the gear you're about to use, you'll typically get a sudden jolt when re-engaging the clutch as physics brings everything back into sync. That jolt can be a big problem when you're moving along swiftly, causing instability or even a loss of traction, particularly in rear-wheel-drive cars. So the point of rev matching is to blip the throttle simultaneously as you downshift gears in order to bring the engine speed to a closer match with the wheel speed before you re-engage the clutch in that lower gear, in turn providing a much smoother downshift. When braking is thrown in, you get heel-toe downshifting, which involves some dexterity to use all three pedals at the same time with just two feet – clutch in, slow the car while revving, clutch out. However, even if you're aware of heel-toe technique and the basic elements of how to perform a rev match, perfecting it to the point of making it useful can be difficult.

BMW 3 Series eDrive plug-in hybrid spotted in development

BMW has shown its commitment to the development of hybrid and electric powertrains in recent years, with vehicles in its ActiveHybrid range, electrics like its BMW ActiveE and range-extended EVs like the i3 and i8. Plug-in hybrid-electric vehicles are clearly top-of-mind for the German automaker. We saw spy shots of the PHEV BMW X5 eDrive prototypes about a year ago, and now our shooters have come through with a 3 Series-bodied version of the technology, as well.
In addition to the obvious "Hybrid Test Vehicle" designation you see on the bodysides of this 3er, we also note that a second 'fuel cap' - presumably hiding the electric charge point - is in evidence. It's a fairly safe assumption that this 3 Series is making use of the same turbocharged four-cylinder engine and electric motor configuration that the X5 eDrive used. In the case of the X5, that meant a top electric-only speed of 75 miles per hour, with a range of just under 20 miles, and 0-62 mph in under 7 seconds. With considerably lighter, compact sedan bodywork clothing the PHEV drivetrain, we'd guess that the 3 Series eDrive could improve on each of those numbers.