& Pumps
Back to the main menu
|
Motors & Pumps |
PRBC Concept | Back to the main menu |
| 1. Some facts | 2. Sources of usable energies on a vehicle | 3. Hybrid architectures | 4. Specifications overview |
- we saw to the § 3.b that the engine must have :
o a volume reduces to the maximum (maximal compactness)
o a maximal output power at least equal to the one of a current middle car
o a modulable power
- we saw to the § 3.c that it must :
o be perfectly and naturally balanced (without artifices as the addition of unbalanced rotating shaft)
o possess a modulable capacity by sufficiently small steps
o permit a high liberty in the variable wedging of the valves, so much to the admission that to the exhaust
o have a variable volumetric ratio, at least by steps and ideally continuously variable
o tpossess numerous rooms of combustion
O use a 4 times cycle that encourages the admission and the explosion, and whose TDC/BDC are cleared quickly
Besides, if we wish that the future motor is feasible, it is necessary to base the design on existing technologies that gave their proofs extensively. For example :
- to
the technologies of machining and milling, of extrudage, of sawing.:
the motor should not include any too parts to manufacture.
- to the technologies of fuel injection: the motor should use existing components, as low pressure feeding pumps, high pressure injection pumps, of the carburetors or the electromagnetic actuators, of the spark plug for gasoline ignition or pre-warming for Diesel.
- to the indispensable technologies to all motor: radiators, oil or water pumps, alternators, gearings, straps, chains and electronic piloting.
It is necessary for us to hierarchize all these features
of which some are bound. They can regroup themselves under the
following general functions classified qualitatively by order of
importance :
2. To permit an appropriate maximal power
3. To make vary the output power by sufficiently small steps
4. To use a 4 times cycle with fast transition between the BDC / TDC
5. To permit a high liberty of variable wedging for the valves
6. To use some technologies solely having given their proofs
7. To make continuously vary the volumetric ratio
8. To have a perfectly and intrinsically well balanced engine
We now have the "functions" that the motor should assure. The specifications functional is going to introduce quantitative criterias for every function.
Specifications of the
new architectures of the motor SYCOMOREEN
| Function n° | Criterias | Levels | Flexibility | Commentary |
| 1: To encourage the compactness | The compactness defined by: C =
Vasp / Vmot with : Vasp: aspirated volume on 2 rounds of the motor shaft Vmot: volume of the engine without pumps and accessories |
C = 0,15 | At least | What represents a downsizing of factor 4:
- either 4 times more power to equal volume - either a 4 times smaller clutter to equal power |
| 2: To permit a sufficient maximal power | The power maximal delivered by the motor | 70 HP | At least | Power of a city-car completed by about 40 HP of an electric traction |
| 3: To make vary the output power by sufficiently small step | Percentage of the available total power that every step represents | 25% | +0% | mimimum 5 steps of output power between 0 and 100%, allowing every room to function at full load, therefore in optimal conditions. |
| 4: To use an optimized 4 times cycle | To allocate comparable duration for the admission, the compression, the explosion and the exhaust | 25% | +/- 5% | Every time of the cycle requires a sufficient length to fill its role without energy losses . One will be able to encourage the admission and the explosion slightly. |
| fast transition between
the BDC / TDC Duration of passage with more of 90% of the TDC/BDC __________________________________ duration of the half of a cycle |
10% | + 0% | The fast clearing of the TDC reduces the flights of fluid, the thermal losses trough the breech, limit the formation of NOx and encourage compatibility with the auto-ignition (HCCI,CAI...). On the rod / crankshaft system, it represents 20% of the length of the half of a cycle | |
| 5: To permit a high liberty of variable wedging for the valves | Amplitude of regulated angle of wedging for the valve | + / - 360° | At least | The variable wedging permits indispensable adjustments to respect the anti-polluting norms and to grant the power of the motor. It also allows to achieve the Miller cycle by an advance of the admission closing (reduced consumption) |
| Speed of piloting of the wedging | 1 / 10 of the time necessary to 1 motor cycle in the concerned room | At more | The variable wedging must be fast in comparison to duration of one motor cycle. | |
| Independence of a room to the other | Total independence of a room to the other | / | It is necessary to be able to adjust independently each room to activate / disactivate the combustion at will . | |
| Possibility to maintain a valve constantly in the same position while the engines runs | Open, closed or partially opened | All possible position | In order to continuously plug / open the valves , what can have some applications to extinguish some comustion rooms and even to convert them into compressor in the aim of a compressed air storage for braking phases | |
| 6: To use some technologies having given their proofs | All processes and technologies previously signalled | Not to require processes or unknown mechanical organs | / | Paradoxically, only basing the design on the existing processes make possible the industrial development of new technologies. |
| Age of the process or the technology | 5 years | At least | ||
| Number of products using the process or
the technology or number of factories having industrialized the process / technology |
100 000 or 10 | At least | The know-how of the motorists and major manufacturers of components must be pertinently re-used. | |
| 7: To make continuously vary the volumetric ratio | Possible values for the volumetric report | of 7 to 24 | + / - 5% | To adjust this volumetric ratio is synonymous of a high mastery of the overfeeding for the motor, permitting compactness (downsizing) and reduced consumption, thus pollution. |
| Speed of the volumetric ratio's regulation | 1 / 10 of the time necessary to 1 motor cycle in the concerned room | At more | The regulating of the volumetric ratio must be quick compared to the duration of one motor cycle | |
| 8: To have a
perfectly and intrinsically well balanced engine
|
Amplitude of the displacement of the G center of inertia for of the engine during the motions of all its parts | 0 | / | No vibratory strength is generated thus. |
| Variation of the moment of inertia for the engine in relation to all axis passing by G during the motions of its parts | 0 | / | No vibratory torque is generated thus. |
| 1. Some facts | 2. Sources of usable energies on a vehicle | 3. Hybrid architectures | 4. Specifications overview |
|
Motors & Pumps |
PRBC Concept | Back to the main menu |