Mahindra and Mahindra Ltd

Ahmadābād, India

Mahindra and Mahindra Ltd

Ahmadābād, India
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Patent
Mahindra and Mahindra Ltd | Date: 2017-01-04

The present disclosure provides an arrangement for packaging an engine of a vehicle. The arrangement comprises a frame having a front end and a rear end, a vehicle body secured on the frame, a first pair of wheels coupled to the frame near the front end thereof and a second pair of wheels coupled to the frame near the rear end thereof, the first and second pair of wheels adapted to support the frame, and the engine transversely disposed with respect to the longitudinal axis of the frame, and drivingly coupled to at least one of the first pair of wheels and the second pair of wheels.


Krishna K.A.,Mahindra and Mahindra Ltd. | Patil S.,Mahindra and Mahindra Ltd.
SAE Technical Papers | Year: 2017

In today's competitive automobile marketplace with reduced vehicle development time and fewer prototypes/tests, CAE is playing very crucial role in vehicle development. Automobile environment demands ever improving levels of vehicle refinement. Performance and refinement are the key factors which can influence the market acceptance of vehicle. Driveline is one of the key systems whose refinement plays critical role in improved customer satisfaction. Because of the virtue of the driveline functionality, driveline induced noise and vibration are the most common issues in the AWD vehicle development programs. Refinement of the drive line needs complicated nonlinear full vehicle CAE MBD models for the evaluation of driveline induced noise and vibration responses at different operating conditions [1]. In this paper a simplified approach is adapted for solving the Noise & Vibration issue which has been identified at the prototype testing level of an AWD vehicle development. Linear finite element method is used as a basic tool in identifying the root cause and propose the design solution. In presented work full flexible FE driveline model was built for modal analysis and the ODS was matched with test behavior. After establishing the correlation between the FE and Test, different system variables were optimized to reduce the system level response. Later these solutions were evaluated for seat vibrations and cabin noise levels. This technique can be used where the time, resources and system inner details are not available or those are limited to build the complete nonlinear CAE models. With this simplified approach it was possible to quickly resolve the driveline induced N&V problem. © 2017 SAE International.


Soni L.,Mahindra and Mahindra Ltd.
SAE Technical Papers | Year: 2017

With the increase in number of vehicles and amount of traffic, safety has come out to be a big concern in vehicle's dynamic stability. There are certain system's limits beyond which if a vehicle is pushed it may become unstable. One of the major areas of research in vehicle dynamics control has been lateral velocity and yaw rate control. With this, situations like vehicle spinning, oversteer, understeer etc. can be addressed. The challenge for the next generations of vehicle control is the integration of the available actuators into a unique holistic control concept. This paper presents the driver reference generator developed for the Integrated Vehicle Dynamics Control concept. The driver reference generator processes the driver inputs to determine the target vehicle behavior. The generation of reference behavior is a key factor for the integrated control design. The driver reference generation is validated on a real vehicle. The driver reference generation consists of three different parts such as steady state linear response, steady state nonlinear response and dynamic calibration. Dynamic calibration is required in situations when system's behavior gets sudden deviation in its linear response region. Control and actuation at steering wheel leads to operation of the system in its linear region, controllers like PID, Smith Predictor are implemented to achieve high Gain Margin(GM) and high robustness and their results are compared. © 2017 SAE International.


Babar G.K.,Mahindra and Mahindra Ltd.
SAE Technical Papers | Year: 2017

Canopy design is governed by CPCB regulations. The regulations explicitly tells about noise levels. It's very important to have the proper ventilation of canopy to ensure the proper working at all climatic conditions. Mostly it is installed at commercial locations & hence the ownership cost matters. Reducing the footprint without affecting the power output is challenging. It implies the need of the CFD simulation to predict the cooling performance of the canopy. The baseline canopy is tested to estimate the performance parameters. It is modelled in CFD with all the minute details. All the parts including engine, alternator, fan, fuel tank are modelled. MRF(Moving Reference Frame) model used to simulate fan performance. The cooling systems like radiator & oil cooler is modelled as porous region. The total flow across canopy & the air velocity across critical regions is used to define the performance. The regions like exhaust manifold, head, block, exhaust pipe are treated as critical regions. CFD simulation of the baseline canopy show 96% co-relation with the test. With this the optimization process is followed & ten different designs are evaluated for the performance. The optimized design is having 20% less footprint, 30% less volume with better thermal performance. The paper explicitly tell about the methodology followed for designing a competitive genset with the help of CFD. The CAD data of the optimized design is used to create the drawings for the individual component & proto is built with these parts. The testing of proto shows 98.5% correlation. The use of CFD with strategic target setting helped to converge the design fast & delivered a best in class product. © 2017 SAE International.


Abraham M.,Mahindra and Mahindra Ltd.
Annual Fuels and Lubes Asia Conference and Exhibition | Year: 2016

Fuel economy (FE) and CO2 reduction through low friction lubricants are important and easy to adopt. Optimization of fluid properties for an application is real challenge. A presentation covers the drivers for vehicle design; emission norms of EU and India; current scenario in India; engine oil specifications for UV/SUV; engine oil design drivers; FE engine oils characteristics; how friction modifier impact; durability performance of oil; and case studies involving FE on SUV and HD vehicle. This is an abstract of a paper presented at the F+L Week 2016 (Singapore 3/8-11/2016).


Patidar A.,Mahindra and Mahindra Ltd
SAE Technical Papers | Year: 2010

In a very competitive environment, product development in automobile industry needs to be fast paced with best in quality to stay ahead in the race. Therefore a clear understanding of customer requirements is essential in successful design and development of systems. Failure in any system development step can result in costly design and tooling changes, schedule delays and ultimately, customer dissatisfaction. A team was formed to design and develop an automotive system by applying Design for Six Sigma Green Belt methods and tools. The hypothesis of this study was that a substantial opportunity exists to increase project efficiency while providing what customer wants, by following a standardized statistical work practice for managing requirements throughout the life of product development using the methodology of Design for Six Sigma DMADV (Define, Measure, Analyze, Design and Verify). In this paper an automotive HVAC system is designed following DFSS methodology. The application process of DFSS tools like Kano analysis for Voice of Customer, Monte Carlo Simulation for project duration calculation, Measurement System Analysis, Quality Function Deployment (QFD), Triz- contradict problem solving technique, Pugh matrix, Design of Experiment (DOE) strategies and process capability for HVAC system development is discussed. The paper will also present how the DFSS process can improve project performance, cost and time while delivering quality products to the customer. Copyright © 2010 SAE International.


Kunal R.,Mahindra and Mahindra Ltd.
SAE Technical Papers | Year: 2011

This paper presents a simulation of the stiffness of the shift fork of a manual transmission using contact pattern analysis and optistrut. All the subsystem (i.e. synchronizer and the shift system component) are constrained to optimize the shift fork stiffness. A-5-speed manual transmission is used as an example to illustrate the simulation, co-relation and validation of the optimization of the gear shift fork stiffness. The shift system was modeled in the software to collate the synchronization force, shift system gap etc with the constraint on the shift fork. It is constrained by the synchronizer sleeve and the fork mounting on the gear shift rail. The synchronizer force is then applied on the gear shift fork pads which are translated to the synchronizer sleeve. It has a number of pads which come into contact at different occasion of the synchronization because of the varying stiffness of the fork. The contact is distributed to optimize the deflection of the fork in the synchronizer for abuse load. The synchronization force is distributed over the pads which are in contact during the synchronization phase. The fork tends to deflect with the synchronizer sleeve during synchronization thus acting as a damper and storing energy. In the free flight zone the energy is released thus providing a positive drop (The derivative function of the detent ramp profile should turn negative) and reducing the double bump i.e. (the force generated when the synchronizer sleeve hits the clutch body ring) during synchronization. It also reduces the fork pre- loading (the gear shift fork is always positively in contact with the synchronizer sleeve after the synchronization has taken place) as the fork is retrieved after synchronization from the sleeve contact. The gear shift lever vibration and gear rattle is also reduces as the shift fork contact from the gear shift sleeve is relieved. Thus the contact analysis and optistrut of the shift fork ensures that the gear shift fork is optimized for stiffness and stress thus aiding in synchronization. Copyright © 2011 SAE International.


Chhabra M.,Mahindra and Mahindra Ltd.
SAE Technical Papers | Year: 2016

By reducing overall noise emanating from Engine at design phase, permits to reduce both time-to-market and the cost for developing new engines. In order to reduce vibration and radiated noise in engine assembly, oil pan is one of the most critical components. This study explains the key-steps that are executed to optimize the oil pan design for 4-cylinder diesel engine by improving Normal Modes, modified Topology, reduced Forced Frequency Response and ATV analysis for reducing its noise radiation. Using Multi-body tool crankshaft forces were generated and the FE model of Base Design was analysed for its noise radiation and panel contribution was done for finding the most radiating panels using Boundary Element Method approach. A series of iterative optimization were carried out with commercial software. Parameters like Stiffness, material property, Ribbing patterns and Shape of the Oil pan was modified to shift the natural frequencies of the component and reduce the sound radiation. Subsequently, the article is concluded by results comparison of baseline design over optimized Vibro-Acoustic results which was obtained from Boundary Element Method showing 5-6 dB(A) reduction in 1meter Engine Noise. The presented methodology proves to help the designers with the definition of a design that reaches the requested Noise and Vibration targets, weight-cost targets along with the manufacturability constrains. Copyright © 2016 SAE International.


Patent
MAHINDRA AND MAHINDRA Ltd | Date: 2013-03-26

The present invention discloses a monoblock engine in which the head and the block of the engine are cast integrally. The engine incorporates a cylinder and water coolant jackets, intake manifold and an exhaust manifold, vertical intake and exhaust valves, core removal holes, and a push-fit type cylinder liner which is secured in place so that leakage of fuel from the cylinder is eliminated. The water coolant jackets for the head and the block are connected using four water jacket gateways or connectors. The monoblock is fitted with the crankcase using a leak proof & robust flange-joint and mechanical fastening system which is easy to install. The invention is embodied for a single cylinder engine as well as multi-cylinder engines. By integrating cylinder head and manifolds with block, the critical joint between head and block and head and intake Manifold will be eliminated. At the same time, gasket and mechanical fasteners for tightening also can be eliminated. The water jacket design is communized & optimized for both head and block for better performance.


Patent
MAHINDRA AND MAHINDRA Ltd | Date: 2015-02-24

The present disclosure provides an arrangement for packaging an engine of a vehicle. The arrangement comprises a frame having a front end and a rear end, a vehicle body secured on the frame, a first pair of wheels coupled to the frame near the front end thereof and a second pair of wheels coupled to the frame near the rear end thereof, the first and second pair of wheels adapted to support the frame, and the engine transversely disposed with respect to the longitudinal axis of the frame, and drivingly coupled to at least one of the first pair of wheels and the second pair of wheels.

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