Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse

The test results published earlier have proven that the previously proposed engine cooling circuit when combined with exhaust heat recovery and reuse could expedite the warm-up process after cold start and has improved the fuel economy by up to 4. With the evolution of the earlier concept, the study...

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Main Authors: Osman, A., Mohd Razali, R., Nurdin, N.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.21977 /
Published: SAE International 2018
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85045444913&doi=10.4271%2f2018-01-0086&partnerID=40&md5=774a5c7901f0fbd9f0c77d6fb7481982
http://eprints.utp.edu.my/21977/
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spelling utp-eprints.219772018-08-01T01:10:08Z Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse Osman, A. Mohd Razali, R. Nurdin, N. The test results published earlier have proven that the previously proposed engine cooling circuit when combined with exhaust heat recovery and reuse could expedite the warm-up process after cold start and has improved the fuel economy by up to 4. With the evolution of the earlier concept, the study discussed in this paper explores further improvements to the cooling circuit to expedite the warm-up process. In particular, with some changes to the cooling circuit, the heat recovered from the exhaust gas is reusable right away to heat up the heat exchangers for engine oil, CVT oil and cabin heater. Next, the thermostat opening temperature and leakage rate can also be optimized to prolong the heat recirculation and preservation periods. Finally, the coolant flow rate across the heat recovery unit can also be varied as a function of time right after the cold-start. These additional measures although capable of improving the warm-up process come with limitations. For example, prolonged throttling of the coolant flow across the heat recovery unit can be risky in terms of component overheating and coolant boiling. Some coolant boiling although tolerable to certain extent in many modern engines may cause prolonged coolant flow interruption across the heat recovery unit. In addition to that, the throttling of coolant flow although favorable in conserving heat in the cylinder head, it hinders the heat transfers to CVT and engine oils. In the paper, the warm-up periods when the parameters changed are evaluated during idle, NEDC and internally developed actual driving cycle. The warm-up periods of the proposed improvements are later compared with the warm-up periods of Baseline cooling circuit and the previously proposed cooling circuit. © 2018 SAE International. All Rights Reserved. SAE International 2018 Article NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85045444913&doi=10.4271%2f2018-01-0086&partnerID=40&md5=774a5c7901f0fbd9f0c77d6fb7481982 Osman, A. and Mohd Razali, R. and Nurdin, N. (2018) Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse. SAE Technical Papers, 2018-A . http://eprints.utp.edu.my/21977/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description The test results published earlier have proven that the previously proposed engine cooling circuit when combined with exhaust heat recovery and reuse could expedite the warm-up process after cold start and has improved the fuel economy by up to 4. With the evolution of the earlier concept, the study discussed in this paper explores further improvements to the cooling circuit to expedite the warm-up process. In particular, with some changes to the cooling circuit, the heat recovered from the exhaust gas is reusable right away to heat up the heat exchangers for engine oil, CVT oil and cabin heater. Next, the thermostat opening temperature and leakage rate can also be optimized to prolong the heat recirculation and preservation periods. Finally, the coolant flow rate across the heat recovery unit can also be varied as a function of time right after the cold-start. These additional measures although capable of improving the warm-up process come with limitations. For example, prolonged throttling of the coolant flow across the heat recovery unit can be risky in terms of component overheating and coolant boiling. Some coolant boiling although tolerable to certain extent in many modern engines may cause prolonged coolant flow interruption across the heat recovery unit. In addition to that, the throttling of coolant flow although favorable in conserving heat in the cylinder head, it hinders the heat transfers to CVT and engine oils. In the paper, the warm-up periods when the parameters changed are evaluated during idle, NEDC and internally developed actual driving cycle. The warm-up periods of the proposed improvements are later compared with the warm-up periods of Baseline cooling circuit and the previously proposed cooling circuit. © 2018 SAE International. All Rights Reserved.
format Article
author Osman, A.
Mohd Razali, R.
Nurdin, N.
spellingShingle Osman, A.
Mohd Razali, R.
Nurdin, N.
Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse
author_sort Osman, A.
title Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse
title_short Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse
title_full Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse
title_fullStr Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse
title_full_unstemmed Powertrain Warm-Up Optimization Involving Simplified Split Cooling with Integrated Exhaust Heat Recovery and Reuse
title_sort powertrain warm-up optimization involving simplified split cooling with integrated exhaust heat recovery and reuse
publisher SAE International
publishDate 2018
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85045444913&doi=10.4271%2f2018-01-0086&partnerID=40&md5=774a5c7901f0fbd9f0c77d6fb7481982
http://eprints.utp.edu.my/21977/
_version_ 1741196551743602688
score 11.62408

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