Automatic Clutch Engagement Control for Parallel Hybrid Electric Vehicle

Automatic clutch engagement control is essential for all kinds of vehicle power transmissions. The controllers for vehicle power transmissions may include model-based or model-free approaches and must provide high transmission efficiency, fast engagement and low jerk. Most vehicle automatic transmissions are using torque converters with transmission efficiencies up to 96%. This paper presents the use of fuzzy logic control for a dry clutch in parallel hybrid electric vehicles. This controller can minimize the loss of power transmission since it can offer a higher transmission efficiency, up to 99%, with faster engagement, lower jerk and, thus, higher driving comfortability with lower cost. Fuzzy logic control is one of the model-free schemes. It can be combined with AI algorithms, neuro networks and virtual reality technologies in future development. Fuzzy logic control can avoid the complex modelling while maintaining the system’s high stability amid uncertainties and imprecise information. Experiments show that fuzzy logic can reduce the clutch slip and vibration. The new system provides 2% faster engagement speed than the torque converter and eliminates 70% of noise and vibration less than the manual transmission clutch.

Study on vibration characteristics of hydraulic planetary transmission considering engine and torque converter excitation

Large-size vehicle loaders are mainly used in various construction projects with complex working environment, which has a serious impact on the internal vibration of the whole system. In this study, the vibration characteristics of hydraulic planetary transmission of vehicle loader considering the influence of the external excitation are evaluated theoretically and experimentally. The output torque of the four-stroke six-cylinder diesel engine is obtained by force calculation of crank and connecting rod mechanism. The equivalent stiffness and damping of the torque converter are solved according to the torsional dynamic equation of the torque converter. The trapped oil area, oil pressure, and flow rate of gear meshing part are extracted to obtain the trapped oil pressure of variable-speed pump. Then, the multi-degree-of-freedom gear system dynamic model is established to calculate the meshing force, which is applied to vibration response analysis model by using mode superposition method. Lastly, the vibration response test is performed on the experimental prototype to verify the calculation method. The conclusion shows that the generation principle of external excitation and its calculation method in this paper are feasible in the analysis of dynamic characteristics of hydraulic planetary torque converter.

Modeling, calculation, and analysis of torsional vibration characteristics of the hydrodynamic transmission system in engineering vehicle

According to the typical working conditions of a loader and considering the complexity of the working conditions, the hydrodynamic transmission powertrain system was modeled in this study. Because the hydrodynamic torque converter is a flexible fluid transmission component in the transmission system, this study proposes and establishes equivalent variable damping and equivalent variable stiffness models of the hydrodynamic torque converter. Based on this, a torsional vibration simulation model of the loader with variable damping and stiffness is proposed, and the frequencies and amplitudes of the torsional resonance modes of the transmission system varying with engine speed and hydrodynamic torque converter speed ratio are obtained. It is determined that the variable stiffness of the hydrodynamic torque converter has little effect on the natural frequency of the vehicle, and taking variable damping and stiffness as input, the natural frequency and resonance points of the transmission system can be calculated more accurately. The simulation modeling and calculation approach are experimentally verified, and the simulation results are valid and closer to the real resonance.

Pengembangan Media Pembelajaran Cutaway Transmisi dan Transfer Suzuki SJ-410 dan Torque Converter di Laboratorium Chasis Fakultas Teknik UNY

Pembelajaran merupakan proses pendidikan yang hakekatnya merupakan komunikasi, yaitu metode penyajian gagasan dari seorang pendidik kepada penerima (mahasiswa). Dalam mempermudah pembelajaran diperlukan adanya media dan pengembangan media pembelajaran agar pesan yang sampaikan oleh pendidik dapat diterima dengan dengan baik dan mudah oleh peserta didik.Tujuan dari penilitian ini adalah membuat dan mengembangkan produk media pembelajaran transmisi dan transfer Suzuki SJ 410 dan Torque Converter untuk pembelajaran di laboratorium Chasis Jurusan Pendidikan Teknik Otomotif. Mengetahui hasil pengembangan media dapat dipergunakan sebagai media pembelajaran. Penilitian ini merupakan pengembangan media pembelajaran Tranmisi dan transfer Suzuki SJ 410 dan Torque Converter dengan metode Cutway yaitu metode membelah memotong bagian alat untuk mengetahui komponen di dalamnya tanpa mengurangi komponen. Penelitian ini dilaksanakan di Laboratorium Chasis, Jurusan Pendidikan Teknik otomotif UNY. Teknik Pengambilan data menggunakan dokumentasi, wawancara dan observasi. Teknik analisis data yang digunakan teknik analisis deskriptif, sehingga didapatkan rancangan mesin yang aman, berfungsi efektif, dan efisienHasil penelitian pengembangan media pembelajaran Tranmisi dan transfer Suzuki SJ 410 dan Torque Converter yang sudah di implementasi dan dapat digunakan untuk pembelajaran di laboratorium chasis sesuai dengan kompetensi yang dibutuhkan dalam pembelajaran. Dengan media pembelajaran Tranmisi dan transfer Suzuki SJ 410 dan Torque Converter yang menarik dan mudah pemahaman sistem kerja alat sehingga proses belajar mengajar berjalan dengan lancar dan dapat memudahkan dosen dalam pembelajaran kepada mahasiswa. Pencapaian hasil belajar mahasiswa sangat baik yaitu sebesar 60 % mendapatkan nilai A.

Low-RPM Torque Converter (LRTC)

The concept concerned in this paper is based on energy conversion of the ocean waves via rotational generators. The objective of this research is to develop a new type of slow-motion converter. The LRTC device consists of a drum that is connected via wire to a floating buoy. The drum is connected to rotary generators. The generators are heavily braked when the direction of movement changes (up/down); this is because the generators have been charged the maximum load in order to obtain maximum output power. For upcoming improvement, the generators should have some power storage as flywheel. In the future experiments, the torque converter can even be tuned to rotate in resonance with the incoming waves, strongly increasing power absorption. Constant force springs are applied for this purpose. The focus of this project is, therefore, a new generation of wave power device for utility-scale energy conversion offering a cost of energy that can compete with established energy resources.

EVALUASI KARAKTERISTIK ENERGY TORQUE CONVERTER BERDASARKAN PENGARUH RASIO PUTARAN TERHADAP KOEFESIEN TORSI DAN EFESIENSI

Abstrak Konverter torsi berfungsi mimdahkan daya dari motor induk ke system transmisi secara halus dan effisien yang ditunjukan melalui karakteristik energinya. Karakteristik-karakteristik converter torsi dinyatakan sebagai hubungan antara parameter-parameter eksternal, yaitu hubungan moment putar poros-poros, daya dan kecepatan putar (putaran) serta effisiensi terhadap rasio kecepatan. Dalam penelitian ini dilakukan uji karakteristik converter torsi yaitu pengaruh perubahan rasio putaran terhadap rasio torsi dan kapasitas torsi dan efesiensi. Putaran pompa tidak dapa dijaga konstan untuk berbagai variasi beban dan bervariasi dari 200 – 500 rpm. Putaran turbin selalu lebih kecil dari putaran pompa, yang menandakan bahwa terjadi slip antara fluida kerja pada ruang clearance antara impeller dan roda turbin. Pada saat beban output meningkat, maka kecepatan impeller turbin akan melambat. Momen yang dibutuhkan menggerakan turbinlebih besar, kemudian menurun dengan naiknya rasio putaran. Semakin tinggi putaran turbin, maka torsi yang dibutuhkan poros beban menjadi lebih kecil. Rasio torsi hasil experimental telah mencapai hasil yang mendekati hasil perhitungan teoritis. Efesiensi konveter torsi naik sesuai dengan kenaiakan rasio putaran dan mencapai maksimun pada maksimum nilai rasio putaran.