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Hydraulic Hybrid Transmission 

Designed as a direct replacement, for the vehicles existing transmission or gearbox. The Hydraulic Hybrid Transmission (HHT), operates the same as an electric hybrid car, with one exception, there are no expensive batteries to replace or dispose of.

This product will  transform any motor vehicle into a fully functioning hydraulic hybrid. 

 

The hydraulic hybrid transmission is best described as a hydro-mechanical transmission, incorporating a regenerative drive component.
To enhance the hydro-static drive a mechanical clutch is employed to complete a direct connection between the internal combustion engine and the driving wheels of the vehicle. 

Designed for new vehicle manufacturers this product may prove to be  economical to produce, as an aftermarket product for commercial vehicle operation i.e. Taxi Cab, Delivery Vans, Shuttle buses and Heavy Vehicles.

 

This type of hybrid system is being produced and marketed by Parker Hydraulics  for heavy commercial vehicles.

 



Testing conducted by the US Environmental Protection Agency (EPA), of a series hydraulic hybrid vehicle,     achieved a 55% improvement in fuel economy and a 40% reduction in exhaust emissions.

Modes of Operation

The “Hydraulic Hybrid Transmission”  transfers power from the internal combustion engine to the wheels in 4 different stages.

  1. Low to medium speed, power is transmitted hydraulically. The internal combustion engine is decoupled from the driveline, which now only drives the hydraulic pump. Which in turn drives the hydraulic motor and propels the vehicle.
  2. High speed or cruising, power is transmitted mechanically. A mechanical clutch engages direct coupling to the driveline. The hydraulic pump and motor are disengaged.
  3. Depending on the road speed, the transmission uses both hydraulic and mechanical means to transfer power between stage 1 and stage 2.
  4. Regenerative Braking is term used by hybrid vehicles to describe the action of capturing and storing free energy when braking. When the vehicle starts braking, the pump/motor is engaged and uses the momentum of the vehicle to pressurize fluid into a high-pressure accumulator. Later when the vehicle accelerates this pressurized fluid (free energy) is used to propel the vehicle. This process captures and reuses over 70% of the energy normally lost during braking.

Hydraulic hybrid vehicles share the same architecture and operate in much the same manner as an Electric Hybrid Vehicle. The outcome for all hybrid vehicles is to reduce fuel consumption and emission. This is achieved by using kinetic energy generated when slowing the vehicle. The method is called "regenerative braking". In an electric hybrid the motor/generator is used as a break to slow the vehicle, this generates electricity and charges the vehicles batteries.

In a hydraulic hybrid the Pump/Motor generates energy by forcing oil into a hydro-pneumatic accumulator, where nitrogen gas is compressed to produced a high-energy output on demand. 


Below are 6 of the most common drive-line configurations. The “Hydraulic Hybrid Transmission” is adaptable to all types of motor vehicles and drive-lines.


1.     Longitudinal front engine, RWD

2.     Longitudinal front engine, FWD

3.     Transverse front engine transaxle, FWD

4.     Longitudinal transaxle, RWD

5.     Transverse rear engine transaxle, RWD

6.     Longitudinal rear engine transaxle, RWD

Acronyms

RWD; Rear Wheel Drive

FWD; Front Wheel Drive




To accommodate the wide variety of vehicle platforms described above, we have developed 3 basic designs. DETAILS BELOW

A . The transverse transaxle for the typical FWD vehicles

B. The inline longitudinal transmission for the typical RWD vehicle

C. The longitudinal transaxle for the not so typical vehicles


A . The transverse transaxle for a typical FWD vehicles

This can be produced as a 2 or 4 wheel drive hybrid drive system



The main components of the Hydraulic Hybrid Transmission are highlighted in the above image. The green section depicts the replacement transaxle and the blue cylinder is the twin piston hydraulic accumulator.
These 2 components are connected by hydraulic lines to collect and convey the stored energy. 



B. The inline longitudinal transmission for a typical RWD vehicle

This can be produced as a 2 or 4 wheel drive hybrid drive system


The main components of the Hydraulic Hybrid Transmission system are highlighted in the above image. The green section depicts the replacement transmission or gearbox and the blue cylinder is the twin piston hydraulic accumulator. These 2 components are connected by hydraulic lines to collect and convey the stored energy. 



C. The longitudinal transaxle, for the not so typical motor vehicle


 

This can be produced as a 2 or 4 wheel drive hybrid drive system



The main components of the Hydraulic Hybrid Transmission are highlighted in the above image. The green section depicts the replacement transmission or gearbox and the blue cylinder is the twin piston hydraulic accumulator. These 2 components are connected by hydraulic lines to collect and convey the stored energy. 


Electronics

The Mechatronic Control Unit (MCU) is the electronic module that controls all parameters of the vehicles driving cycle.







Expressions of interest are sought from companies wanting to be an early adopter of this emerging technology

 

 

Cliff Hall.




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