Introduction to Hydraulic Hybrid Systems for Road Vehicles

Considerable attention has been given to the design and efficiencies of electric hybrid propulsion systems and energy storage technologies. Although they draw much less attention, hydraulic hybrid propulsion and regenerative braking systems for road vehicles are a cost effective alternative to electric systems and have relevance to important sectors of the passenger and commercial vehicle markets.

In this two-day seminar, hydraulic hybrid vehicle systems and their potential will be examined using model based evaluations. This will include an evaluation and comparison of hybrid configurations as well as the introduction of components used in these hydraulic hybrid systems. Also provided will be details on how hydraulic systems are designed and integrated into vehicles, including interactions with braking systems and various other vehicle systems. Recent developments in hydraulic machines and an update on the component technology needed to implement these solutions will also be presented.

What Will You Learn

By attending this seminar, you will be able to:
  • Identify the fundamentals of parallel and series hydraulic hybrid vehicle transmission systems and components
  • Evaluate the applicability of such systems to particular vehicle applications
  • Identify how hydraulic hybrid system components can be integrated into the vehicle
  • Recognize the interactions with other vehicle systems (e.g. engine, transmission, ABS, foundation brakes) and integration of controls

Is This Course For You

This course will benefit individuals new to hydraulic hybrid systems as well as engineers and designers involved in all areas related to the design and development of vehicle powertrain systems. Also benefiting will be individuals interested in the interaction of this hybrid system with braking systems and engine controls.

Materials Provided

This data is not available at this time

Course Requirements

This data is not available at this time


  • Introduction and Overview
    • Objectives
    • Course outline and scope
  • Hybrid Vehicle Systems - Outline and Comparisons
    • Definitions
    • Energy storage
    • Basic electric and hydraulic configurations: Parallel and Series -- Efficiency evaluations; Weight comparison; Cost outline
  • Hydraulic Components for Vehicle Hybrid Systems
    • Accumulators -- Types; Size and weight; Efficiency and response; Installation
    • Pumps and Motors: Requirements -- Efficiency and response
    • Types: Descriptions and Potential Applications (Axial Piston; Swash Plate; Bent-Axis; Radial Piston; Other
    • Other components - valves pipes, filters, coolers, etc.
    • Controls -- System; Vehicle
  • System Design
    • Simulation strategy -- Drive cycles; Launch criteria; Maximum speed; Towing/grades
    • Stop/Start functionality -- Accessory drives
  • Control Strategies
    • Regenerative braking
    • Parallel hybrid hydraulic systems
    • Series hybrid hydraulic systems
    • Engine operation management -- Simplified engine calibration for emissions and fuel economy; Advanced engines enabled by series hybrids
    • Safe Operation
  • Application Examples
    • Car and taxi
    • Light truck (SUV, pickup, work truck)
    • Light delivery truck and shuttle bus
    • Refuse and transit bus
    • Off-highway
  • Hydraulic Hybrid Potential and Developments
  • Course Assessment and Summary