Advanced Automotive Steering Systems Report 2012
SupplierBusiness, November 2012, Pages: 88
Today chassis, of which steering systems are one of the critical components, are responsible for the vast majority of the ride, handling, comfort and safety as an integrated, and fundamentally important system.
A simple functional description of the chassis today completely fails to adequately illustrate that in many ways it is the foundation for the vehicle’s driving dynamics, has an enormous effect on cost, weight and all aspects of the performance of the vehicle from CO2 output to safety.
In this way there is a close connection between steering, as part of the chassis, its performance and the essential DNA of the vehicle. The way that systems are integrated today – the marrying of sensor technology, electronic and mechatronic systems with the more mechanical basic components – is therefore a key battleground for OEMs, and the management of the compromises in steering performance, safety systems, cost and weight is an increasingly important aspect of product or brand differentiation.
About this report
This report begins by examining steering feel and the increasing effect of vehicle electrification and looks at steering and chassis performance. The report goes on to consider the key drivers including fuel efficiency and CO2 emissions, steering design, materials considerations and the packaging dilemma.
Furthermore the report looks at the latest steering system trends, in particular electrically power assisted steering (EPAS), electro-hydraulic power steering (EHPS), electric power steering (EPS), active front steering (AFS), four-wheel steering, steer-by-wire, automated parking and NVH reduction.
Finally the report looks at the latest market developments and provides detailed analysis of 11 key suppliers active within this sector.
Introduction
- Steering feel
- Vehicle electrification
- Increasing influence of electrification
- Steering and chassis performance
- Design compromise
- Manufacturing economics
- Platform development and component commonality
- Noise vibration harshness
Key drivers
Fuel efficiency and CO2 emissions
- The United States
- The European Union
- Japan
- China
- Other countries
- Materials considerations
- Increasing electrification
- Systems integration
- The packaging dilemma
- The future for steering design
Steering system trends
- Electrically Power Assisted Steering (EPAS)
- Surface acoustic wave
- Software enabled features
- Electro-Hydraulic Power Steering (EHPS)
- Electric Power Steering (EPS)
- Active Front Steering (AFS)
- Four-wheel steering
- Steer-by-wire
- Automated parking
- NVH reduction
- Pressure ripples in steering hydraulics
Market developments
- Technology progress
- Sector development
- Technology is changing
Supplier Profiles
- Autoliv
- ixetic
- JTEKT
- Mando
- NSK
- Schaeffler (INA)
- Showa
- Tedrive
- TRW Automotive
- Valeo
- ZF
Tables and Figures
Table 1: Advantages of EPAS
Table 2: Illustration of active steering effects on driver inbput
Figure 1: Average power consumption 1990 – 2010 for mid size and luxury cars
Figure 2: Electrical power requirements for NEDC and actual customer requirements for various vehicle classes
Figure 3: Steering system design compromise (EPAS)
Figure 4: Conventional chassis system compromises
Figure 5: The complex functional harmony required to provide driving quality
Figure 6: Matching and similar parts for the Volkswagen B/C platform
Figure 7: Fuel economy standards to 2015 for selected countries (US mpg)
Figure 8: Weight share of modules and their weight increase
Figure 9: Cost comparison of lightweight vehicle structures
Figure 10: Additional costs entailed by tougher European CO2 legislation for a vehicle with emissions of 161g per km
Figure 11: Average profit per vehicle versus CO2 compliance costs
Figure 12: The growth of integrated functions
Figure 13: The relationship between functions and control units to 2014
Figure 14: X-by-wire roadmap
Figure 15: Mechanical and electric control systems for EPAS
Figure 16: Column mounted electrical assist
Figure 17: Paraxial electrically assisted rack
Figure 18: Differing steering rack types, force and mechanical performance by vehicle class
Figure 19: Active steering system components
Figure 20: A schematic of AFS used in a driver assistance function to enhance vehicle stability
Figure 21: Renault’s active four-wheel steer systems as fitted to the Laguna GT
Figure 22: Nissan’s steer-by-wire system
- Autoliv
- ixetic
- JTEKT
- Mando
- NSK
- Schaeffler (INA)
- Showa
- Tedrive
- TRW Automotive
- Valeo
- ZF
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