[jalsa777]

Although the main focus of the media and the visitors at the AutoExpo are the Automobile Manufacturers, it also serves as the avenue for Auto Ancillaries to showcase their products and new developments.

DENSO is one of the leading developers and manufacturers of auto components. They develop new technologies and products which in-turn enable auto manufacturers to meet the ever stricter fuel economy and emissions norms.

Denso displayed some of their latest developments at the AutoExpo 2012.


New Starter for Stop/Start Systems

• Can start the engine while engine is still rotating.
• It results in upto 1.5 seconds of time saving during engine restarts as compared to traditional starter systems.
• This is achieved by seperating and individually controlling the starter pinion and the starter motor.

More details about the system can be found in the pictures below:

[jalsa777]

Next-Generation Diesel Technology

• New high pressure fuel pump which can develop fuel pressures upwards of 2000 bar
• New intelligent fuel injectors which can individually detect fuel pressure and can accordingly adjust the amount and timing of fuel injection
• There injectors can spray upto 9 times in a cycle

In diesel engines, higher fuel injection pressures allows for finer atomization of fuel spray which helps reduce the Particulate Matter (PM) in emissions. Also, precicely controlled multiple fuel injections in a cycle help reduce Nitrogen Oxide (NOx) emissions

[jalsa777]

Cockpit Simulator

• They had a simulator which demonstrated the future technologies that will improve road safety and driver comfort.
• The system relies on various sensors: Radar, Sonar, Vehicle-to-vehicle conmmunication, vehicle-to-infrastructure communication, GPS, live traffic information, etc.
• Active Steering wheel: The system detects impending collisions and warns the driver by vibrating the steering wheel, it can also make course corrections to avoid collisions.
• Smart Map Monitor: It integrates live traffic data and also data fom various sensors to suggest best routes and also warns the driver of obstacles, etc.
• Information Guide System: Its a speech and diplay interface which learns the driver's dining & shopping preferences, hobbies, etc. over time and then suggests best options when visiting new places.

Remote Touch Controller

• Its a central interface module which can control almost all the ancillary functions of the car.
• It is a computer mouse like pointing device with adaptive haptic feedback.
• It has mechanisms inside which give a realistic haptic feedback to the operator and allows easy navigation through the menus.
• It has been installed in various Lexus vehicles.

Full TFT Colour LCD Instrument Cluster

• This technology is already empolyed in various production vehicles.
• The ability of the car to detect human figures and other obstacles via infrared sensors was displayed.

[jalsa777]

Producs for Hybrid Vehicles

• Hybrid vehicles require a lot of components which are not required in conventional vehicles.
• The battery systems and the engine to battery switching systems need a lot of high-end electronics. These technologies are being continuously improved and hopefully we'll be seeing more mainstream hybrid products in the coming years.
• Also, cooling systems for the electric motors and battery packs, which are very important in hybrid vehicles have been a subject of considerable research lately.
• Hybrid technology is definitely going to see mass market acceptance soon according to me.
• Denso has supplied the following products for the Toyota Prius: Power Control Unit, Battery-monitoring unit, DC-DC converters, electric compressors.

Advanced Air Conditioning System

• Denso have developed an improvement over the conventional air-conditioning cycle (the one based on the expansion valve).
• They call it the 'Ejector Cycle'.
• Basically they replace the traditional Expansion valve/tube with a component called 'Ejector'.
• This 'Ejector' also takes in supplemental refrigerant flow from the evaporator and thus increases the pressure of the refrigerant going into the compressor.
• This reduces compressor load by upto 20%, resulting in less load on the engine and thus fuel saving.

More info here: http://www.globaldenso.com/en/techno...or_cycle_e.pdf

The Ejector Cycle:



Cross section view of the ejector valve:

[GTO]

Thread moved from the Auto Expo forum to the Technical Stuff section.

[Rehaan]

Originally Posted by jalsa777

... injectors can spray upto 9 times in a cycle

I guess this is close to idle (ie less cycles per second/minute)? Any idea how fast these things can go per second/minute?

Originally Posted by jalsa777

[*]Can start the engine while engine is still rotating.[*]It results in upto 1.5 seconds of time saving during engine restarts as compared to traditional starter systems.

From what i understand, this system is only really useful if you decide to re-start the engine within 1.5 seconds of shutting it off. Seems like a fairly unlikely case, but i guess its a small step in the right direction when used with a start-stop system that might non-intuitively decide its time to turn the engine off, just a second before the light goes green.

Originally Posted by jalsa777

[*]This is achieved by seperating and individually controlling the starter pinion and the starter motor.

I remember seeing a beautiful video on how just one motor both cranks the engine, as well as engages and disengages the motor - using inertia to its advantage. Can't seem to find it now though :(

cya
R

[Sutripta]

Great!
Now what about writeups of the other major vendors displays?

Regards
Sutripta

[jalsa777]

Originally Posted by Rehaan

From what i understand, this system is only really useful if you decide to re-start the engine within 1.5 seconds of shutting it off. Seems like a fairly unlikely case, but i guess its a small step in the right direction when used with a start-stop system that might non-intuitively decide its time to turn the engine off, just a second before the light goes green.

This starter motor is geared towards hybrids.
When the car is moving on pure electric mode and then the engine needs to be started, the motor will help cut the delay there.

Also, it will allow better flexibility.
Eg.: Current hybrids operate in 3 modes:
1. Pure Electric
2. Electric and IC Engine.
3. Pure IC Engine

There will be a lot of scenarios which are on the edge between mode 1 and mode 2. In such scenarios, current systems might be keeping the IC engine on to reduce the start-up delay. In such situations, this motor will help tremendously.

Note: These are my conclusions and may or may not be accurate.

[Rehaan]

Originally Posted by jalsa777

There will be a lot of scenarios which are on the edge between mode 1 and mode 2. In such scenarios, current systems might be keeping the IC engine on to reduce the start-up delay. In such situations, this motor will help tremendously.

No doubt that this is an advantage over the existing starter technology, however, what i'm pointing out here is that it sounds like a large advantage, but in reality, it not that much of a big deal.

Reason : Normal starters have the disadvantage of waiting 1.5 seconds - but this is ONLY when re-starting the engine immediately after its been turned off (ie upto 1.5 seconds after turning the engine off).

Even if you see their graph, they've drawn it to show the "restart demand" from the very millisecond the engine is turned off, thats an extreme case, and a very rare one. Though ofcourse with auto start/stop, these conditions might arise more often than we'd expect.

cya
R

[im_srini]

Originally Posted by Rehaan

I remember seeing a beautiful video on how just one motor both cranks the engine, as well as engages and disengages the motor - using inertia to its advantage. Can't seem to find it now though :(

Hi Rehaan, are you by any chance referring to the "old" Bendix starters ? These starters relied on the inertia of a heavy pinion gear (on the starter motor's shaft) for engagement (with the ring gear teeth on the flywheel).

[Sutripta]

The old Bendix system. Most commonly seen on our Ambassadors.
Simple. mechanically elegant. Unfortunately had a couple of major shortcomings.

Regards
Sutripta

[star_aqua]

If there is a restart request before the engine rpm falls below 200 rpm, there is no need of starter. all it needs is just enabling the injections.