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Sedans Lexus LS 460/460L Lexus LS 460 Suggested Improvements
52 messages, Last post on Nov 22, 2009 at 9:10 AM
You are in the Lexus LS 460/460L Forum. Your Hosts are pat & karens
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If you accidentally leave a door ajar, or even the trunk lid not quite closed, the headlights will remain on until the battery is dead. Here is my suggested improvement: Install some logic in the electronic vehicle control system that turns the headlights off when the battery voltage falls below a safe level. Also turn off any other battery drains. If you (Lexus) can think of any situations in which this would be undesirable, then provide a mechanism for overriding this feature, but let the default be to protect the battery. Does any car provide this feature?
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Replying to: rennybosch (May 28, 2007 2:00 pm) Does any car provide this feature? Ford has had that for years. After 10 minutes, if there is an abnormal drain on the battery, inside light left on, for instance, the Body Control Module cuts power to all auxiliary functions (leaving power to clocks, alarm, etc.) until the car is unlocked - when all power is restored. Not an original idea, but a good one, and I too wonder why my Explorer has this - but my Lexus doesn't 
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Replying to: rennybosch (Oct 27, 2006 5:19 pm) Sam Sam
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Replying to: fun1 (Jun 01, 2007 2:14 pm) Thanks for the info. Renny |
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Replying to: nvbanker (May 28, 2007 7:12 pm)
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Replying to: roddmod11 (Aug 26, 2007 2:00 pm) |
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Replying to: sidgriggs (Aug 26, 2007 2:15 pm) ELECTRIC POWER CONTROL SYSTEM DESCRIPTION The electric power control system is provided to supply power constantly to the vehicle equipped with many electronic systems. The electric power control ECU always monitors the battery condition. In accordance with the battery condition, the electric power control ECU implements various control measures on systems that operate while the vehicle is parked or systems that require a large amount of power in a short period of time. System Image Charging Control Outputs the charging control request to the ECM in accordance with the battery status. Load Control Limits the operation of the ECU in order to suppress discharge of the battery and voltage drop. Control While Parked Cuts parasitic current of switches in order to prevent the battery from being degraded while the vehicle is parked for a long period of time. 2. Charging Control General This control lowers the generated voltage when the vehicle is idling or is being driven at a constant speed, and raises the generated voltage when the vehicle is decelerating. This reduces the load on the engine as a result of the electric generation of the generator, thus contributing to the fuel economy of the engine. During acceleration, this system regulates the generated voltage in order to place the amperage estimation value close to the target value. This system consists primarily of ECM, generator, electric power control ECU, battery current sensor, and battery temperature sensor. The electric power control ECU detects the state of charge and discharge of the battery based on battery voltage and the signals from the battery current sensor and battery temperature sensor. Then, it calculates the accumulated amperage and sends a charging control request signal to the ECM. Based on the charging control request signal from the electric power control ECU, the signals from various sensors and switches, and the charging state signal from the generator, ECM outputs signals to the generator (IC regulator). Thus, the ECM controls the generated voltage to be optimal for the driving condition. Under the following conditions, the electric power control ECU sends a request signal to the ECM so that the ECM stops charging control and switches the generator to normal power generation mode. - Various electrical loads are input. - Failures of various sensors and switches are detected. This is no German or American junk.
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Replying to: roddmod11 (Aug 26, 2007 3:12 pm) |
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It would be nice to have an ETA (Estimated Time of Arrival) display on the navigation screen. It's obviously very easy to calculate, since the nav computer already knows (and displays) time-to-arrival, and it knows current time (or it can get it from the rest of the car data base). The only challenge is to find room in the display for another 6-character entry (eg. 12:34p) plus a label for it, without robbing the display of valuable navigation data. Of course having the time-to-arrival, we can ourselves add that to the current time, but on a car like this, should we have to do mental arithmetic? Also, observing the ETA over a longer period and noting whether it is staying approximately constant or advancing or retarding, would give us a little extra information.
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Replying to: rennybosch (Sep 21, 2007 12:14 pm)
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