1 Hydrogen: A Promising Frontier for Energy-Environment Solutions -- 1.1 Introduction -- 1.2 Fossil Fuel Combustion: Energy Security and Environmental Impact -- 1.3 Alternative Fuels for Internal Combustion (IC) Engines -- 1.4 Pollution from Vehicles -- 1.5 Hydrogen Energy Pathways -- 1.6 Hydrogen in a Net Zero Emission (NZE) Scenario -- 1.7 Hydrogen Color Codes and Carbon Footprint -- 1.8 Green Hydrogen -- 1.9 Electrolysis Development: Energy Demand and Global Warming Potential -- 1.10 Emission Through Hydrogen Production by Different Routes -- 1.11 Exhaust Emissions from Hydrogen Combustion in Engines -- 2 Hydrogen's Properties and Fuel Induction in Engines -- 2.1 Introduction -- 2.2 Physical Properties -- 2.3 Combustive Properties of Hydrogen -- 2.4 Emissivity of the Hydrogen Flame -- 2.5 Hydrogen Embrittlement -- 2.6 Green Hydrogen and Hydrogen Use in Engines -- 2.7 Combustion Strategy -- 3 The Hydrogen Engine: Performance, Emission, and Combustion -- 3.1 Introduction -- 3.2 Hydrogen Engines: A Historical Journey of Nearly Two Centuries -- 3.3 Mixture Formation and Fuel Induction Techniques -- 3.4 Port Fuel Injection: Performance, Combustion, and Emission Features -- 3.5 Timed Manifold Injection: Injector Development -- 3.6 Direct Injection -- 3.7 Hydrogen as a Fuel for the Compression Ignition Engine -- 3.7.1 Hydrogen-Diesel Dual Fuel Engine -- 3.8 Optimization of Dual Fuel Operation -- 3.9 Liquid Hydrogen -- 4 Undesirable Combustion Phenomena -- 4.1 Introduction -- 4.2 Hydrogen-Oxygen Reaction Mechanism -- 4.3 Flammability Range and Explosion Limit -- 4.4 Flame Propagation -- 4.5 Laminar Burning Velocity -- 4.6 Preferential Diffusion and Turbulent Burning Velocity -- 4.7 Undesirable Combustion Phenomena in a Hydrogen Engine -- 4.8 Backfire: Causes and Character -- 5 Modeling and Simulation Studies on the Hydrogen Engine -- 5.1 Introduction -- 5.2 Chemical Kinetics Models -- 5.3 Thermodynamic Models -- 5.4 Computational Fluid Dynamics (CFD) Models -- 5.5 Heat Transfer Submodel -- 6 Laser Diagnostics, Optical, and Other Sensing Techniques -- 6.1 Introduction -- 6.2 Key Laser Diagnostics and Optical Methods -- 6.3 Mixture Formation in a Hydrogen Engine -- 6.4 Laser-Induced Fluorescence (LIF), Planar Laser-Induced Fluorescence (PLIF), and Particle Image Velocimetry (PIV) -- 6.5 Particle Image Velocimetry -- 6.6 Laser-Induced Breakdown Spectroscopy (LIBS) -- 6.7 Spark-Induced Breakdown Spectroscopy (SIBS) -- 6.8 Plume Ignition Combustion Concept (PCC) -- 6.9 High-Speed Schlieren Imaging -- 6.10 Controlled Autoignition (Homogeneous Charge Compression Ignition) -- 7 Design Criteria and Safety Features of a Dedicated Hydrogen Engine -- 7.1 Introduction -- 7.2 Safety-Related Properties for the Hydrogen Engine -- 7.3 Technical Features for Hydrogen Engine Design -- 7.4 Some Property-Based Benefits and Challenges -- 7.5 NOx Emission -- 7.6 Load Control Strategy and Engine Components -- 7.7 Emerging Ignition Technologies -- 7.8 Fuel Delivery System -- 7.9 Valves -- 7.10 Crankcase Ventilation -- 7.11 Hot Spots -- 7.12 Lubrication System -- 7.13 Piston Rings and Crevice Volumes -- 7.14 Combustion Chamber -- 7.15 Throttle, Compression Ratio -- 7.16 Materials -- 7.17 Rotary Engine Structure for Hydrogen Operation -- 7.18 Safety Features for Engine Tests in the Laboratory -- 7.19 Safety Considerations for H2IC Vehicles -- 8 Hydrogen in Blends with Other Fuels -- 8.1 Introduction -- 8.2 Adding Hydrogen to CNG -- 8.3 Oil Analysis -- 8.4 Hydrogen Added to Biogas, Biodiesel -- 8.5 Hydrogen-Ethanol Blend -- 8.6 Hydrogen-DME -- 8.7 Hydrogen with LPG (Liquefied Petroleum Gas) and Propane -- 9 Some Upgraded Strategies for Hydrogen Engines -- 9.1 Introduction -- 9.2 Supercharging and Turbocharging -- 9.3 Stratification and Injection Strategy -- 9.4 Homogeneous Charge Compression Ignition (HCCI) -- 9.5 Reactivity Controlled Compression Ignition (RCCI) -- 9.6 Hydrogen Rotary Engine -- Concluding Remarks and Perspectives -- 10 The Path Forward -- 10.1 Introduction -- 10.2 Hydrogen Engines for Land and Marine Transport -- 10.3 Heavy-Duty Engines, Trucks, and Generating Sets -- 10.4 The Rotary Engine -- Concluding Remarks -- References -- Index.