Abrégé

A piston-in-piston hydraulic unit is disclosed that utilises an elastic volume to store and release energy with each stroke by varying the hydraulic fluid volumes in and out of the hydraulic unit.

Classes IPC  ?

• F03C 1/00 - Machines motrices à liquide à pistons alternatifs
• F03C 1/28 - Pistons spécialement adaptés à ces machines motrices
• F15B 15/14 - Dispositifs actionnés par fluides pour déplacer un organe d'une position à une autreTransmission associée à ces dispositifs caractérisés par la structure de l'ensemble moteur le moteur étant du type à cylindre droit
• F16D 57/06 - Freins à résistance liquideFreins à résistance à l'air comportant une pompe de circulation du fluide, le freinage étant obtenu par étranglement de la circulation
• F16J 1/00 - PistonsPistons à fourreauPlongeurs

Abrégé

A traditional variable compression ratio system for use in a reciprocatmg-piston engine either requires large flows of hydraulic fluid or does not have provision to exchange the hydraulic fluid sufficiently often to prevent overheating of the fluid. A variable compression ratio system (100) for use in a reciprocatmg-piston engine is provided. The system (100) allows the compression ratio in a combustion cylinder (910) of the engine to be varied by varying the distance from a combustion chamber facing surface (113) of a piston (112) to the center of pivotal connection of a connecting rod (114) to a crankshaft (920). The distance is varied responsive to the supply and withdrawal of pressurized hydraulic fluid. The hydraulic fluid is supplied and discharged by a slave pump (140) pivotally connected to the connecting rod (114) at a first end and pivotally connected to a stationary point at a second end. The slave pump (140) supplies and withdraws hydraulic fluid responsive to the rotation of the crankshaft (920) and a hydraulic backpressure controlled using a pressure control valve (170).

Classes IPC  ?

• F01B 31/14 - Changement du rapport de compression
• F02B 75/04 - Moteurs avec distances variables entre les pistons et les culasses aux positions du point mort haut

Abrégé

A regeneration system (100) for use in a vehicle having a reciprocating-piston engine. The regeneration system (100) captures energy (e.g. braking energy), stores the energy, and subsequently uses the stored energy to generate motive power for the vehicle. The motive power can be generated in conjunction with motive power provided by the engine. The regeneration system (100) comprises a variable displacement pump/motor (110) that is connected to a connecting rod (940) in each cylinder (910) of the engine. The pump/motor (110) comprises a fluid chamber (112), a primary piston (114) mechanically coupled to the connecting rod (940) and a slave piston (116) coupled to the primary piston (114) via resilient means (118). A control unit (160) controls a plurality of valves (125, 140, 176, 135) to direct the exchange of pressurized hydraulic fluid between the pump/motor (110) and a hydraulic accumulator (150) in synchronous timing with the operation of the engine.

Classes IPC  ?

• B60K 6/12 - Les moteurs primaires comportant des moteurs à combustion et des moyens d'accumulation d'énergie mécanique ou fluide au moyen d'un accumulateur à fluide rechargeable

Abrégé

A regenerative brake system and a variable displacement pump/motor for use therein. Each cylinder of the pump/motor having a main piston and a second piston between which is defined a space for hydraulic fluid, and a resilient element acting on the second piston to bias it toward the main piston. Variable displacement is achieved by controlling a volume of pressurized fluid that is injected and exhausted between the main and second pistons. Brake, drive and neutral modes of operation of the pump/motor are achieved by controlling the timing (relative to a drive shaft phase) of the injection and exhaust of the fluid. Regeneration is achieved by storing pressurized fluid generated by the pump/motor in an accumulator in brake mode and using the stored pressurized fluid to power the pump/motor in drive mode.

Classes IPC  ?

• B60T 8/40 - Dispositions pour adapter la force de freinage sur la roue aux conditions propres au véhicule ou à l'état du sol, p. ex. par limitation ou variation de la force de freinage selon une condition de vitesse, p. ex. accélération ou décélération comportant un régulateur de pression fluidique répondant à une condition de vitesse comportant un circuit de fluide additionnel ayant des moyens de pressurisation du fluide pour modifier la pression du fluide de freinage, p. ex. comportant des pompes entraînées par les roues pour détecter une condition relative à la vitesse, ou des pompes commandées par des moyens indépendants du système de freinage