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Hybrid Vehicles Lexus RX 400h RX400H surge power on stopping
14 messages, Last post on May 20, 2009 at 5:29 AM
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Yesterday, my Lexus RX400H, 2006, had a sudden surge in engine power as I was pulling into a parking space. It felt as though the car accelerated forward at an increasing speed after I was coasting into the space. It didn't stop until I rann into a wall... Has anyone else had this problem?? I know for certain that I was not pressing on the accelerator when this occured.
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Replying to: marmi (Jan 31, 2009 8:12 am) |
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Replying to: marmi (Jan 31, 2009 8:12 am) At least I now know there are two of us. |
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Replying to: nmrk (Mar 25, 2009 7:16 pm) A slight bump in the roadbed, steel plate, even a "plastic" roadway marking, can cause this effect.
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Replying to: wwest (Mar 27, 2009 9:27 am) Thank you for your response. Sounds a little technical but I think I understand. In any event, it sounds like I need not be worried about the "little surge". I had read about major surges and was concerned that my problem might be exacerbated. NMRK |
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Replying to: nmrk (Mar 25, 2009 7:16 pm) I was thankful to get your message about your surging problem when braking. I also have not been aable to establish a "pattern of behavior" and am paranoid when I come to a stop. My surge led me into a brick wall and was a very costly incident-today I received a new insurance bill that tripled my insurance rate. The dealership checked it out and said it could not have happened the way I described it. I checked my floor mat and of course it was not the problem. I don't know if it will take a terribly unfortunate accident for Lexus to solve this problem, but I am thinking of getting rid of my car, which I love otherwise. I am sure there are not just "the two of us" who have experienced this event.
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Replying to: marmi (Mar 27, 2009 2:14 pm)
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Replying to: ganjaspliffin1 (Apr 24, 2009 5:14 am)
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Replying to: marmi (Apr 24, 2009 6:46 am) These are FWD vehicles, so it is EXTREMELY important not to allow braking of ANY kind, engine, regen, or actual frictional braking, to result in wheelskid/slip and therefore raise the potential for an accident due to loss of directional control. To that end VW has just introduced a new engine RPM control design that will automatically up-rev the engine should the driver inadvertently downshift to a level wherein the rotation decline of the front driven wheels is so rapid lockup will soon result. So we may now see a resurgence of FWD amd F/awd vehicles with stick shifting. "..rolling through a toll booth...." Hmmmm.... Metal expansion joint, slightly WET metal expansion joint.....?? Or "plastic" road striping, WET "plastic" road striping...?? Most modern Anti-lock systems are desired to pre-empt wheelskid/lockup by sensing that the wheel(s) rotation rate is decling so rapidly the lockup will soon result. With light to moderate braking and with the hybrid battery SOC being fairly low you may very well be relying on regen braking ENTIRELY. If ABS activation is required then regen must first be INSTANTLY cancelled in favor of frictional braking ONLY. For a programmer there is no simple nor easy solution to this problem. The best solution, given the situation, need for ABS due to impending wheel lockup, it seems to me that it would be better/best to bring the frictional braking on line in a moderate way. Previous regen braking level was heading toward wheelskid/lockup, best to bring frictional braking on line at a slightly lower braking level. So the driver feels a "lurch" forward..... As I have said before, why not disable ABS altogether unless VSC indicates maintenance of directional control, directional correction, is required..? The most of those brief instances of low traction due to expansion joints, plastic striping, and "bumps", would be transparent, "non-events". |
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I have read your explanations re the surge--but am now confused. What should I do to either deal with or get rid of this surge problem. I haven't run into anything but it worries me. I am also thinking of getting rid of the car. I like it but don't trust it. On the other hand--is this a common problem with cars utilizing similar technology? Thanks for your attempt to educate me--but now I am confused. NMRK
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