FORMULA RENAULT 3.5
TECH SPEC Cosworth MQ12 ECU
Processors: Motorola MPC565 and Motorola MPC5200B, 8MB of external RAM, 4MB flash memory, 2GB internal SD card
Supply voltage: +8V to +18V with reverse battery, over-voltage and load dump protection
Engine configuration: 1-12 cylinders, 2 stroke, 4 stroke or rotary, natural or forced induction
Digital outputs: 20x PWM alternate function (5A), 16x logic level driven
Digital inputs: 16x dedicated, can also be configured as analogue inputs
Logging throughput: 2000 samples per second
Crank and cam sensor: dual crank input, single dedicated cam input, Hall effect or inductive
The inclusion of a Formula 1-style, driver-operated drag reduction system (DRS) makes the aero package on the Renault 3.5 unique amongst spec series
Electronics. ‘I think that they have sold over 250 cars. To do something like Superleague or Formula Nippon is one thing – supporting 24 cars and 12 teams or whatever. But it is a very different prospect looking at up to 300 cars around the world. You simply cannot have support engineers at every single event. So you have to develop a system that is fundamentally easy to use, and we achieved that. Essentially, we took on the burden of running the series in terms of the electronics. That really lead us to getting the contract for the new 3.5 car.’ The ECU chosen by
Cosworth is its Pectel MQ12, which features two Motorola processors, 20 configurable injector / PWM drivers combined
with 12 IGBT ignition outputs and 16 logic level coil driving outputs, making this ECU capable of fully sequential fuelling on normally aspirated, turbocharged and supercharged engines of up to 12 cylinders. Fly-by-wire capability is also included, along with provision for stepper and DC motors, which are employed on the Renault 3.5. The MQ12 crank and camshaft pattern recognition system allows the ECU to be used with virtually any OEM timing wheel. This sophisticated pattern recognition algorithm also facilitates synchronisation during slow and uneven cranking conditions. After some work on the Zytek engine on the firm’s dyno to get the fly-by-wire working with the new engine and ECU combination,
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www.racecar-engineering.com • May 2012
it was taken to Renaultsport’s facility in France and fitted to the first test car. ‘It fired up first time and that was quite a momentous occasion,’ recalls Cosworth’s lead engineer. ‘Then it shifted first time too, as the ECU also controls that. Indeed, one of the things the test drivers like Andy Soucek commented on was how well it shifts, and how it works in different conditions.’ The new Formula Renault 3.5
is available exclusively to teams chosen to participate in the Formula Renault 3.5 series, for a price of €220,000 (£183,600 / $292,000) (excluding VAT) for a complete car. An upgrade kit for the previous generation chassis is also available for €125,000+VAT (£104,300 / $166,000).
Injector / PWM drivers: 20x peak and hold (5A peak, 2.5A hold)
Thermocouple inputs: 3x k-type (12 bit)
Analogue inputs: 37x dedicated (12 bit), 2x wide band lambda (12 bit), 8x knock sensor (12 bit) with configurable gain stage, 16x digital configured as analogue
Auxiliary outputs: 1x full bridge (10A) peak, 2x full bridge (5A) peak, 1x stepper motor alternate function
Ignition drivers: 12x IGBT internal clamp (+400V, 20A), 16x logic level driven
Internal sensors: 4x ECU internal temperature, 1x battery voltage
Comms ports: 1x RS232 (RXD/TXD port) 2x CAN 2.0B, 1x CAN/RS232, 1x Ethernet (100baseT)
Case operating temp: –25degC to +70degC
Weight: 622g
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