Optimal Design of Power-On Downshift Control of Series-Parallel Hybrid Transmission Based on Motor Active Speed Regulation

Multi-speed transmission is the main development direction of hybrid transmission, which has brought higher shift quality requirements than traditional fuel vehicle transmission. However, there less research on shifting control especially for dedicated (DHT), uses wet clutch as a element. This paper studies power-on downshift process two-speed series-parallel proposes strategy based motor active speed regulation, and deeply analyzes causes maximum impact during process. The results show that reverse torque produced in eliminating remaining slip root cause impact. On this basis, two optimization strategies are proposed to reduce improve quality. simulation can effectively suppress In meanwhile, any pressure OG (off-going) phase within range (2.44–2.53 bar), high controlled lower 10 m/s3 be achieved, engineering value practical significance.