http://www.ntsel.go.jp/kouenkai/h20/20-04.pdf

The system consists of three basic modules. The SCR doser (an injector with integrated high pressure pump) is mounted in the exhaust line just ahead of the SCR catalyst and injects the urea solution at 20 bar directly into the exhaust stream. The solution is supplied to the injector by a low pressure pump within the Urea Delivery Module (UDM) in the remote urea tank. The third element of the system is the electronics and software used to control the dosing subsystem.
http://jp.advfn.com/news__43690195.html

inject
〜を(〜に)注入[注射, 圧入, 噴射, 射出, 挿入, 導入, 投入]する, 吹き込む〈into〉
◆an electronically fuel-injected engine 電子燃料噴射式エンジン
◆These particles are injected into the main ring, where they are accelerated to high energies. これらの粒子は, 主リングに注入されそこで高いエネルギーに加速される.
ビジネス技術実用英語大辞典　第３版