Editing BYD Auto (section)

==== {{anchor|DM-i|DM-p|DMO}} DM-i/DM-p/DMO (fourth generation) ====
[[File:GIMS 2024, Le Grand-Saconnex (GIMS0016-4).jpg|thumb|BYD DM-i powertrain on display]]
In 2021, BYD introduced the DM-i and DM-p systems that replaced the outgoing DM systems.<ref name=":2" /> The DM-i is developed for efficiency-oriented [[front-wheel drive]] models, while the DM-p is adopted for performance-oriented [[all-wheel drive]] models. These systems adopts [[series-parallel hybrid|series-parallel]] [[plug-in hybrid]] technology with a dedicated hybrid transmission (DHT),<ref>{{Cite journal |last1=Li |first1=Song |last2=Wang |first2=Puxi |last3=Zeng |first3=Dong |last4=Peng |first4=Wenjie |last5=Yang |first5=Liu |date=December 2021 |title=Multi-System Coupling DMi Hybrid Vehicle Modeling and Its Performance Analysis Based on Simulation |journal=World Electric Vehicle Journal |language=en |volume=12 |issue=4 |pages=215 |doi=10.3390/wevj12040215 |issn=2032-6653 |doi-access=free }}</ref> consisting of a high-efficiency petrol engine marketed as Xiaoyun (which can power an [[electric generator]]) and a main [[electric motor]] (which can be powered by batteries and/or an electric generator). The Xiaoyun engine uses the [[Atkinson cycle]], has an ultra-high [[compression ratio]] (CR) of 15.5, and has a [[Thermal efficiency|brake thermal efficiency]] (BTE) of 43%, which is claimed to be the world's highest for a production petrol engine.<ref name="www.businesswire.com-2020">{{cite press release | url=https://www.businesswire.com/news/home/20201116005578/en/BYD-Introduces-New-DM-i-Hybrid-Technology-and-1.5L-New-Xiaoyun-Engine | title=BYD Introduces New DM-i Hybrid Technology and 1.5L New Xiaoyun Engine | date=16 November 2020 }}</ref> The DM-i is available with three power levels, codenamed EHS132, EHS145, and EHS160, using a 1.5-litre, a 1.5-litre or a 1.5-litre [[turbocharged]] Xiaoyun engines respectively.<ref>{{cite web |last=常 |first=庆林 |date=2021-07-26 |title=【图】电动机担纲主角 聊比亚迪Ehs电混系统_汽车之家 |trans-title=Electric motor plays a leading role in BYD's EHS hybrid system |url=https://www.autohome.com.cn/tech/202107/1180821.html |access-date=2024-06-13 |website=Autohome}}</ref>

The hybrid drivetrain uses context-dependent components to provide driving power, including battery-only, battery + electrical generator mode, engine-only mode (only at high speeds due to lack of transmission), and battery + engine mode. The engine charges the batteries via the generator when conditions permit. This design allows the engine to remain within its high-efficiency zone.<ref name="www.businesswire.com-2020" />

In late 2023, a derivative of the DM-i and DM-p fourth-generation systems called DMO (Dual Mode Off-road), aka DMO Super Hybrid Off-road Platform<ref>{{Cite web|url=https://www.byd.com/us/news-list/BYD-Launches-its-First-Pickup-Truck-BYD-SHARK-in-Mexico|title=BYD Launches its First Pickup Truck BYD SHARK in Mexico|website=BYD}}</ref> was introduced. It is developed for [[body-on-frame]], [[Off-road vehicle|off-road oriented vehicles]] that use a [[longitudinal engine]] layout such as the [[Fangchengbao Bao 5]] SUV and the [[BYD Shark]] pickup truck.<ref>{{Cite web |date=2023-12-08 |title=马力刺客｜后段功率也够劲儿！ 深度解析一扫短板的比亚迪DMO平台 |trans-title=The rear end power is also strong! In-depth analysis of BYD DMO platform that eliminates shortcomings |url=https://www.sohu.com/a/742281909_383324 |access-date=2024-05-28 |website=Sohu}}</ref>

In January 2024, BYD plans to end the production of pouch-type batteries used in its plug-in hybrid vehicles by 2025 to address durability concerns and the risk of leaking [[electrolyte]]. Instead, the company will use prismatic batteries known as "Short Blade" for its plug-in hybrid vehicles going forward.<ref>{{Cite web |last=Zhang |first=Phate |date=2024-01-17 |title=BYD to stop producing pouch batteries for its PHEVs over leak concerns, report says |url=https://cnevpost.com/2024/01/17/byd-to-stop-producing-pouch-batteries-for-phevs-report/ |access-date=2024-01-31 |website=CnEVPost |language=en-US}}</ref>