QUOTE(SportyHandling @ Jun 30 2023, 08:05 AM)
I checked the specs and indeed the engine of the 1.8V (139PS / 172Nm) is more powerful than the hybrid (98PS / 142Nm). However, there's the motor generator in the hybrid that gives the additional power (72PS / 163Nm). Not sure how the motor generator will contribute to acceleration power though but YS Khong did mention he found the normal version of the Cross to be more powerful than the hybrid version when going up the hill.
QUOTE(SportyHandling @ Jun 30 2023, 12:54 PM)
Pros of Corolla Cross hybrid over non-hybrid/GR Sport3. Better fuel consumption in all driving conditions (that's for sure)
Pros of Corolla Cross non-hybrid/GR Sport over hybrid2. Due to the above, slightly better advantage in long highway journeys when it comes to overtaking vehicles at high speeds or climbing steep hills such as going up Genting Highlands
Better fuel consumption in all conditions are not guarantee. Only it is statistically better in most conditions.
Due to parasitic power drawn by MG1 (I'll explain later), if we have hypothetical long drive without need to brake at all, Toyota HSD hybrid will be less efficient.
Any fuel saving is contributed by the 98PS ICE that use Atkinson cycle (in layman = longer combustion stroke than intake stroke to gain higher thermal efficiency, ok maybe not layman enough for those doesn't know Otto cycle, sorry I tried my best).
Here's the 101 of Toyota HSD
- the 72PS/163Nm is called MG2. It has 2 jobs - direct drive the wheel, and regenerative braking
- there is another motor MG1 (unknown spec). It has 2 jobs - charging the hybrid battery from engine, and
control the gear ratio of eCVT2nd job of the MG1 is the one that steal engine power, and can consume 20% of engine torque for 2.4L Camry Hybrid. I couldn't find data for the Cross Hybrid.
So imagine if one is traveling permanent constant speed. Statistically, this is unlikely, even highway we get to brake.
- MG2 has no chance to generate power from braking.
- MG1 consume engine power to maintain hybrid battery level
- MG1 consume engine power to fix gear ratio of eCVT
For comparison normal ICE car or other brand hybrid that use AT/DCT, has permanent mechanical lock to fix gear ratio (tiny amount of electric to maintain oil pressure in AT/DCT).
I guess, this also answer you 2nd question, at continuously high load (including hill climb), it really depends
how much MG2 regenerative charging can keep up with the acceleration requirement, so that we don't need MG1 to keep replenishing battery power and consume engine torque.Then we also don't know the MG2 max RPM, usually for PMSM (permanent magnet synchronous motor), torque started to drop around 50% of max rpm, then at max RPM the torque is about 50% of max torque.
PMSM is popular to low speed efficiency but lack of high rpm performance.
This affect the MG2 torque reduction at high speed. Toyota didn't disclose this, at least I couldn't find the spec.
We also don't know MG1 power. What is its output ratio to engine max horsepower (which decide how much parasitic load on the engine). Again Camry Hybrid case is 20%, remember it is bigger 2.4L engine.
Of course, all are still limited by how fast the hybrid battery charge (aka C rate). Most of the time this is the bottleneck. Put bigger MG1 also no point.
This post has been edited by constant_weight: Jun 30 2023, 03:45 PM