Abstract A hybrid vehicle includes an engine (1) for producing
propulsive forces, an electric motor (2) for selectively generating
assistive drive forces in addition to the propulsive
forces and generating electric energy converted from the
propulsive forces, and an energy storage unit (5) for selectively
supplying electric energy to the electric motor (2) and
storing electric energy converted by the electric motor (2). A
control system (7-10) for the hybrid vehicle includes an accelerated/decelerated
state detecting unit (15,31,7) for detecting an accelerated/decelerated
state of the hybrid vehicle, a memory
for storing a plurality of fuzzy rules and membership functions
to determine an operating state of the electric motor (2)
from the accelerated/decelerated state according to a fuzzy
inference process, a goodness-of-fit calculator for determining
respective goodnesses of fit of the fuzzy rules based
on the membership functions from the accelerated/decelerated
state as detected by the accelerated/decelerated state detecting
unit (15,31,7), a goodness-of-fit combiner for combining the
goodnesses of fit as determined by the goodness-of-fit calculating
unit to determine an operating state of the motor (2),
and a motor controller (8) for controlling the electric motor (2)
based on the operating state of the motor (2)
the goodness-of-fit combiner.
A control system in a hybrid vehicle having an
engine for producing propulsive forces, an electric motor
for selectively generating assistive drive forces in addition
to the propulsive forces and electric energy converted
from the propulsive forces, and an energy storage unit for
selectively supplying electric energy to the electric motor
and storing electric energy converted by the electric motor,
comprising: accelerated/decelerated state detecting means for
detecting an accelerated/decelerated state of the hybrid
vehicle; fuzzy inference memory means for storing a plurality
of fuzzy rules and membership functions to determine
an operating state of the electric motor from the accelerated/decelerated
state according to a fuzzy inference process; goodness-of-fit calculating means for determining
respective goodnesses of fit of said fuzzy rules based on
said membership functions from the accelerated/decelerated
state as detected by said accelerated/decelerated state detecting
means; goodness-of-fit combining means for combining the
goodnesses of fit as determined by said goodness-of-fit calculating
means to determine an operating state of the motor;
and motor control means for controlling the electric
motor based on the operating state of the motor as determined
by said goodness-of-fit combining means.
Claim 2
Dependent Claim
89 words
A control system according to claim 1, wherein
said accelerated/decelerated state detecting means comprises
at least one of: throttle-valve-opening detecting means for detecting
an opening of a throttle valve of the engine; throttle-valve-opening rate-of-change detecting
means for detecting a rate of change of the opening of the
throttle valve; and vehicle speed detecting means for detecting a
vehicle speed of the hybrid vehicle; whereby the accelerated/decelerated state can be
detected by said one of the throttle-valve-opening detecting
means, the throttle-valve-opening rate-of-change detecting
means, and the vehicle speed detecting means.
Claim 3
Dependent Claim
75 words
A control system according to claim 1 or 2,
wherein said accelerated/decelerated state as detected by
said accelerated/decelerated state detecting means includes
acceleration and deceleration degrees demanded on the hybrid
vehicle, and wherein said fuzzy rules include: fuzzy rules for increasing the assistive drive
forces generated by said electric motor as the acceleration
degree is larger; and fuzzy rules for increasing the electric energy
generated by said electric motor as the deceleration degree
is larger.
Claim 4
Dependent Claim
61 words
A control system according to claim 1, 2 or 3,
wherein said accelerated/decelerated state as detected by
said accelerated/decelerated state detecting means includes
a vehicle speed of the hybrid vehicle when the hybrid vehicle
is substantially cruising, and wherein said fuzzy rules
include: fuzzy rules for increasing the electric energy
generated by said electric motor as the vehicle speed is
larger.
Claim 5
Dependent Claim
114 words
A control system according to claim 1 or 2,
further comprising stored energy detecting means for detecting
an amount of stored energy of said energy storage unit,
wherein said fuzzy rules and said membership functions
stored in said fuzzy inference memory means include fuzzy
rules and membership functions for determining the operating
state of the electric motor corresponding to the detected
amount of stored energy, and wherein said goodness-of-fit
calculating means comprises means for determining the goodnesses
of fit of said fuzzy rules based on said membership
functions from the accelerated/decelerated state as detected
by said accelerated/decelerated state detecting means and
the amount of stored energy as detected by said stored energy
detecting means.
Claim 6
Dependent Claim
71 words
A control system according to claim 5, wherein
the fuzzy rules stored in said fuzzy inference memory means
so as to correspond to the amount of stored energy of said
energy storage unit include fuzzy rules for either reducing
the assistive drive forces generated by said electric motor
or increasing the electric energy generated by said electric
motor as the amount of stored energy of said energy storage
unit is smaller.
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