Patent US5785138A successfully refreshed from Google Patents.
US5785138A
Expired / Lapsed
US
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Operating method for a hybrid car
Assignee: Mitsubishi Motors Corp
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Filing: 1997-07-28
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Granted: 1998-07-28
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Expires: 2017-07-28
Abstract
Abstract A method and apparatus for operating a hybrid car which includes an electric motor for driving the car, and an internal combustion engine for power generation. At least first and second vehicle operating parameters, such as accelerator pedal depression depth and actual vehicle velocity, are detected. Based on these vehicle operating parameters, a controller controls the electric motor. From these vehicle operating parameters, a vehicle operating state is determined. The charge state of a battery, which supplies electric power to the electric motor, is also detected. Based on the charge state and the vehicle operating state, a target engine operating state is set for the internal combustion engine. The target engine operating states are determined so that low fuel consumption is ensured. The controller then controls the internal combustion engine to achieve the target engine operating state.
Inventors
- 👤 Masato Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:32
CPC Classifications
B; B60; B60K; B60K6/00; B60K6/20; B60K6/42; B60K6/46; B60L; B60L15/00; B60L15/20; B60L15/2045; B60L50/00; B60L50/50; B60L50/60; B60L50/61; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/08; B60W10/24; B60W10/26; B60W20/00; B60W20/10; B60W20/11; B60L2240/00; B60L2240/10; B60L2240/12; B60L2240/40; B60L2240/42; B60L2240/425; B60L2240/44; B60L2240/441; B60L2240/445; B60L2250/00; B60L2250/26; B60L2250/28; B60L2270/00; B60L2270/10; B60L2270/12; B60W2510/00; B60W2510/06; B60W2510/068; B60W2510/24; B60W2510/242; B60W2510/244; B60W2520/00; B60W2520/10; B60W2540/00; B60W2540/10; B60W2710/00; B60W2710/06; B60W2710/0616; B60W2710/0622; B60W2720/00; B60W2720/10; B60W2720/106; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y02T10/60; Y02T10/62; Y02T10/64; Y02T10/70; Y02T10/7072; Y02T10/72
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
156 words
A method for operating a hybrid car, comprising: providing an electric motor to drive driving wheels of said hybrid car; providing a battery to supply electrical power to said electric motor; providing a generator to charge said battery, said generator being provided independently from said electric motor; providing an internal combustion engine to drive said generator, said internal combustion engine driving said generator without providing output torque to said motor; sensing, with at least first and second sensors, at least an actual vehicle velocity and a depression degree of an accelerator pedal; establishing a predetermined target vehicle velocity based on said sensed depression degree; controlling said electric motor based on said sensed actual vehicle velocity and said established predetermined target vehicle velocity; determining a charge state of said battery; setting a target engine operating state in accordance with at least said charge state; and controlling said internal combustion engine to achieve said target engine operating state.
Claim 2
Independent Claim
156 words
A method for operating a hybrid car, comprising: providing an electric motor to drive driving wheels of said hybrid car; providing a battery to supply electrical power to said electric motor; providing a generator to charge said battery, said generator being provided independently from said electric motor; providing an internal combustion engine to drive said generator, said internal combustion engine driving said generator without providing output torque to said motor; sensing, with at least first and second sensors, at least an actual vehicle velocity and a depression degree of an accelerator pedal; establishing a predetermined target vehicle velocity based on said sensed depression degree; controlling said electric motor based on said sensed actual vehicle velocity and said established predetermined target vehicle velocity; determining a charge state of said battery; setting a target engine operating state in accordance with at least said charge state; and controlling said internal combustion engine to achieve said target engine operating state.
Claim 3
Dependent Claim
48 words
The method of claim 1, wherein said setting step sets said target engine operating state as one of at least first and second predetermined engine operating states, and at least one of said first and second predetermined engine operating states reduces fuel consumption of said internal combustion engine.
Claim 4
Dependent Claim
98 words
The method of claim 1, wherein said sensing step senses the accelerator depression degree as a first vehicle operating parameter, and said actual vehicle velocity as a second vehicle operating parameter; and said controlling step includes the steps of: computing said target vehicle velocity based on said accelerator pedal depression depth, setting a target acceleration based on said target vehicle velocity and said actual vehicle velocity, determining a required motor output based on said target acceleration and said actual vehicle velocity, and computing a drive current to output to said electric motor based on said required motor output.
Claim 5
Dependent Claim
26 words
The method of claim 1, wherein said controlling step gradually varies an operating state of said internal combustion engine to achieve said target engine operating state.
Claim 6
Dependent Claim
37 words
The method of claim 1, further comprising the step of: determining a vehicle operating state; and wherein said setting step sets said target engine operating state in accordance with said charge state and said vehicle operating state.
Claim 7
Dependent Claim
200 words
The method of claim 5, wherein said charge state determining step determines whether the battery is in one of sufficiently charged state and an insufficiently charged state; said vehicle operating state determining step determines said vehicle operating state as one of a low-speed, low-load state, medium-speed, medium/high-load state, or a high-speed state based on said first and second vehicle operating parameters; and said setting step includes the steps of, setting said target engine operating state to an off state such that said internal combustion engine stops operating when said charge state determining step determines said sufficiently charged state, setting said target engine operating state to a low-speed, low-load state when said charge state determining step determines said insufficiently charged state and said vehicle operating state determining step determines said low-speed, low-low state, setting said target engine operating state to a medium-speed, medium-load state when said charge state determining step determines said insufficiently charged state and said vehicle operating state determining step determines said medium-speed, medium/high state, and setting said target engine operating state to a high-speed, high-load state when said charge state determining step determines said insufficiently charged state and said vehicle operating state determining step determines said high-speed state.
Claim 8
Dependent Claim
86 words
The method of claim 6, wherein said internal combustion engine controlling step controls said internal combustion engine to operate at an engine speed of 2,000 rpm and a mean effective pressure of 6 to 7 kgf/cm 2 in the low-speed, low-load state, at the engine speed of 3,000 rpm and the mean effective pressure of 8.5 kgm/cm 2 in the medium-speed, medium/high-load state, and at the engine speed of 4,000 rpm and the means effective pressure of 9 to 10 kgf/cm 2 in the high-speed state.
Claim 9
Dependent Claim
153 words
The method of claim 5, wherein said charge state determining step determines whether the battery is in one of a sufficiently charged state and an insufficiently charged state; said vehicle operating state determining step determines said vehicle operating state as one of a low/medium-load state or a high-load state based on said first and second vehicle operating parameters; said setting step includes the steps of, setting said target engine operating state to a standby state when said charge state determining step determines said sufficiently charged state, setting said target engine operating state to a medium-speed, medium-load state when said charge state determining step determines said insufficiently charged state and said vehicle operating state determining step determines said low/medium-load state, and setting said target engine operating state to a high-speed, high-load state when said charge state determining step determines said insufficiently charged state and said vehicle operating state determining step determines said high-load state.
Claim 10
Dependent Claim
77 words
The method of claim 8, wherein said internal combustion engine controlling step controls said internal combustion engine according to said standby state by adjusting a throttle valve of said internal combustion engine to a low opening, according to said medium-speed, medium-load state by adjusting said throttle valve of said internal combustion engine to a medium opening, and according to said high-speed, high-load state by adjusting said throttle valve of said internal combustion engine to a fully-open state.
Claim 11
Dependent Claim
81 words
The method of claim 8, wherein said internal combustion engine controlling step operates said internal combustion engine at an engine speed of 1,000 rpm and a mean effective pressure of 2 kgf/cm 2 in said standby state, at the engine speed of 3,000 rpm and the mean effective pressure of 8 kgf/cm 2 in said medium speed, medium-load state, and at the engine speed of 4,000 rpm and the mean effective pressure of 9 kgf/cm 2 in said high-speed, high-load state.
Claim 12
Dependent Claim
47 words
The method of claim 8, wherein said internal combustion engine controlling step controls said internal combustion engine such that lean combustion is made in the standby state, and combustion is made with a stoichiometric air-fuel ratio when in the medium-speed, medium-load state or the high-speed, high-load state.
Claim 13
Dependent Claim
49 words
The method of claim 8, wherein said internal combustion engine controlling step controls said internal combustion engine such that operation of said internal combustion engine in said standby state is started immediately after a starter key of said hybrid car is turned on to start said hybrid car running.
Claim 14
Dependent Claim
115 words
The method of claim 1, wherein said charge state determining step determines whether the battery is in one of a sufficiently charged state and an insufficiently charged state; said setting step includes the steps of, (a) setting said target engine operating state to an idle state when said charge state determining determines said sufficiently charged state, (b) setting said target engine operating state to a high-output state when said charge state determining determines said insufficiently charged state; and said internal combustion engine controlling step adjusts said internal combustion engine to idle when step (a) sets said idle state, and adjusts said internal combustion engine to high output when said step (b) sets said high-output state.
Claim 15
Dependent Claim
47 words
The method of claim 13, wherein said internal combustion engine controlling step adjusts a throttle valve of said internal combustion engine to a near fully-closed position when said idle state is set, and adjusts said throttle valve to a fully-open position when said high-output state is set.
Claim 16
Dependent Claim
168 words
The method of claim 1, wherein said charge state determining step determines whether the battery is in one of a sufficiently charged state and an insufficiently charged state; said setting step includes the steps of, (a) setting said target engine operating state to a low state when said charge state determining step determines said sufficiently charged state, (b) setting said target engine operating state to a high state when said charge state determining step determines said insufficiently charged state; and said internal combustion engine controlling step controls said internal combustion engine such that a throttle valve thereof is set to a first predetermined opening and a air-fuel ratio thereof is set for lean combustion when step (a) sets said low state, and controls said internal combustion engine such that said throttle valve is set to a second predetermined opening and said air-fuel ratio is set to stoichiometric value when said step (b) sets said high state, and said first predetermined opening is less than said second predetermined opening.
Claim 17
Dependent Claim
26 words
The method of claim 1, wherein said setting step sets a target engine speed and a target mean effective pressure as said target engine operating state.
Claim 18
Dependent Claim
42 words
The method of claim 16, further comprising: setting a target throttle value opening based on said target engine speed and said target mean effective pressure; and wherein said controlling step controls said internal combustion engine based on said target throttle valve opening.
Claim 19
Independent Claim
239 words
A method for operating a hybrid car, said hybrid car including an electric motor for driving said hybrid car, a battery for supplying electric power to said electric motor, a generator for charging said battery, an internal combustion engine operatively isolated from said electric motor and used to drive said generator, and an exhaust gas purifier with a catalyst for purifying exhaust gas from said internal combustion engine, the method comprising: (a) sensing, with at least first and second sensors, at least first and second vehicle operating parameters, at least one of said at least first and second sensors detecting a parameter other than a depression degree of an accelerator pedal and a depression of a brake pedal; (b) controlling said electric motor based on output at least said first and second vehicle operating parameters; (c) determining a charge state of said battery; (d) setting a target engine operating state in accordance with at least said charge state; (e) controlling said internal combustion engine to achieve said target engine operating state; (f) sensing a temperature of said catalyst; (g) determining whether said catalyst is in one of a sufficiently heated state and an insufficiently heated state based on output of said step (f); and wherein said step (d) sets said target engine operating state to an off state such that said step (e) prohibits said internal combustion engine from operating when said step (g) determines said insufficiently heated state.
Claim 20
Independent Claim
239 words
A method for operating a hybrid car, said hybrid car including an electric motor for driving said hybrid car, a battery for supplying electric power to said electric motor, a generator for charging said battery, an internal combustion engine operatively isolated from said electric motor and used to drive said generator, and an exhaust gas purifier with a catalyst for purifying exhaust gas from said internal combustion engine, the method comprising: (a) sensing, with at least first and second sensors, at least first and second vehicle operating parameters, at least one of said at least first and second sensors detecting a parameter other than a depression degree of an accelerator pedal and a depression of a brake pedal; (b) controlling said electric motor based on output at least said first and second vehicle operating parameters; (c) determining a charge state of said battery; (d) setting a target engine operating state in accordance with at least said charge state; (e) controlling said internal combustion engine to achieve said target engine operating state; (f) sensing a temperature of said catalyst; (g) determining whether said catalyst is in one of a sufficiently heated state and an insufficiently heated state based on output of said step (f); and wherein said step (d) sets said target engine operating state to an off state such that said step (e) prohibits said internal combustion engine from operating when said step (g) determines said insufficiently heated state.
Claim 21
Independent Claim
177 words
A system for operating a hybrid car, comprising: an electric motor which drives driving wheels of said hybrid car; a battery which supplies electrical power to said electric motor; a generator which charges said battery, said generator being provided independently from said electric motor; an internal combustion engine which drives said generator, said internal combustion engine driving said generator without providing output torque to said motor; at least first and second sensors for sensing at least an actual vehicle velocity and a depression degree of an accelerator pedal; a target vehicle velocity determining unit which establishes a predetermined target vehicle velocity based on said sensed depression degree; a battery charge sensor for sensing a charge of said battery; and control means for controlling said electric motor based on said sensed actual vehicle velocity and said established predetermined target vehicle velocity, for determining a charge state of said battery, for setting a target engine operating state in accordance with at least said charge state, and for controlling said internal combustion engine to achieve said target engine operating state.
Claim 22
Independent Claim
177 words
A system for operating a hybrid car, comprising: an electric motor which drives driving wheels of said hybrid car; a battery which supplies electrical power to said electric motor; a generator which charges said battery, said generator being provided independently from said electric motor; an internal combustion engine which drives said generator, said internal combustion engine driving said generator without providing output torque to said motor; at least first and second sensors for sensing at least an actual vehicle velocity and a depression degree of an accelerator pedal; a target vehicle velocity determining unit which establishes a predetermined target vehicle velocity based on said sensed depression degree; a battery charge sensor for sensing a charge of said battery; and control means for controlling said electric motor based on said sensed actual vehicle velocity and said established predetermined target vehicle velocity, for determining a charge state of said battery, for setting a target engine operating state in accordance with at least said charge state, and for controlling said internal combustion engine to achieve said target engine operating state.
Claim 23
Dependent Claim
47 words
The system of claim 19, wherein said control means sets said target engine operating state as one of at least first and second predetermined operating states, and at least one of said first and second predetermined engine operating states reduces fuel consumption of said internal combustion engine.
Claim 24
Dependent Claim
105 words
The system of claim 19, wherein said first sensor senses the accelerator depression degree as a first vehicle operating parameter; said second sensor senses said actual vehicle velocity as a second vehicle operating parameter; and said control means controls said electric motor by (1) computing a target vehicle velocity based on said accelerator depression degree, (2) setting a target acceleration based on said target vehicle velocity and said actual vehicle velocity, (3) determining a required motor output based on said target acceleration and said actual vehicle velocity, and (4) computing a drive current to output to said electric motor based on said required motor output.
Claim 25
Dependent Claim
35 words
The system of claim 19, wherein said control means determines a vehicle operating state; and said control means sets said target engine operating state in accordance with said charge state and said vehicle operating state.
Claim 26
Dependent Claim
186 words
The system of claim 22, wherein said control means determines whether the battery is in one of a sufficiently charged state and an insufficiently charged state based on output of said battery charge sensor; said control means determines said vehicle operating state as one of a low-speed, low-load state; medium-speed, medium/high-load state; or a high-speed state based on said first and second vehicle operating parameters; and said control means sets said target engine operating state to an off state such that said internal combustion engine stops operating when said battery is in said sufficiently charged state, sets said target engine operating state to a low-speed, low-load state when said battery is in said insufficiently charged state and said vehicle operating state is said low-speed, low-load state, sets said target engine operating state to a medium-speed, medium-load state when said battery is in said insufficiently charged state and said vehicle operating state is said medium-speed, medium/high state, and sets said target engine operating state to a high-speed, high-load state when said battery is in said insufficiently charged state and said vehicle operating state is said high-speed state.
Claim 27
Dependent Claim
83 words
The system of claim 23, wherein said control means controls said internal combustion engine to operate at an engine speed of 2,000 rpm and a mean effective pressure of 6 to 7 kgf/cm 2 in the low-speed, low-load state, at the engine speed of 3,000 rpm and the mean effective pressure of 8.5 kgf/cm 2 in the medium-speed, medium/high-load state, and at the engine speed of 4,000 rpm and the means effective pressure of 9 to 10 kgf/cm 2 in the high-speed state.
Claim 28
Dependent Claim
142 words
The system of claim 22, wherein said control means determines whether the battery is in one of a sufficiently charged state and an insufficiently charged state based on output from said battery charge sensor; said control means determines said vehicle operating state as one of a low/medium-load state or a high-load state based on said first and second vehicle operating parameters; said control means sets said target engine operating state to a standby state when said battery is in said sufficiently charged state, sets said target engine operating state to a medium-speed, medium-load state when said battery is in said insufficiently charged state and said vehicle operating state is said low/medium-load state, and setting said target engine operating state to a high-speed, high-load state when said battery is in said insufficiently charged state and said vehicle operating state is said high-load state.
Claim 29
Dependent Claim
74 words
The system of claim 25, wherein said control means controls said internal combustion engine according to said standby state by adjusting a throttle valve of said internal combustion engine to a low opening, according to said medium-speed, medium-load state by adjusting said throttle valve of said internal combustion engine to a medium opening, and according to said high-speed, high-load state by adjusting said throttle valve of said internal combustion engine to a fully-open state.
Claim 30
Dependent Claim
76 words
The system of claim 25, wherein said control means operates said internal combustion engine at an engine speed of 1,000 rpm and a mean effective pressure of 2 kgf/cm 2 in said standby state, at the engine speed of 3,000 rpm and the mean effective pressure of 8 kgf/cm 2 in said medium-speed, medium-load state, and at the engine speed of 4,000 and the mean effective pressure of 9 kgf/cm 2 in said high-speed, high-load state.
Claim 31
Dependent Claim
44 words
The system of claim 25, wherein said control means controls said internal combustion engine such that lean combustion is made in the standby state, and combustion is made with a stoichiometric air-fuel ratio when in the medium-speed, medium-load state or the high-speed, high-load state.
Claim 32
Dependent Claim
46 words
The system of claim 25, wherein said control means controls said internal combustion engine such that operation of said internal combustion engine in said standby state is started immediately after a starter key of said hybrid car is turned on to start said hybrid car running.
Claim 33
Dependent Claim
26 words
The system of claim 19, wherein said control means gradually varies an operating state of said internal combustion engine to achieve said target engine operating state.
Claim 34
Dependent Claim
107 words
The system of claim 19, wherein said control means determines whether the battery is in one of a sufficiently charged state and an insufficiently charged state based on output of said battery charge sensor; said control means sets said target engine operating state to an idle state when said battery is in said sufficiently charged state, sets said target engine operating state to a high-output state when said battery is in said insufficiently charged state; and said control means adjusts said internal combustion engine to idle when said idle state is set, and adjusts said internal combustion engine to high output when said high-output state is set.
Claim 35
Dependent Claim
44 words
The system of claim 31, wherein said control means adjusts a throttle valve of said internal combustion engine to a near fully-closed position when said idle state is set, and adjusts said throttle valve to a fully-open position when said high-output state is set.
Claim 36
Dependent Claim
158 words
The system of claim 19, wherein said control means determines whether the battery is in one of a sufficiently charged state and an insufficiently charged state based on output of said battery charge sensor; said control means sets said target engine operating state to a low state when said battery is in said sufficiently charged state, sets said target engine operating state to a high state when said battery is in said insufficiently charged state; and said control means controls said internal combustion engine such that a throttle valve thereof is set to a first predetermined opening and a air-fuel ratio thereof is set for lean combustion when said low state is set, and controls said internal combustion engine such that said throttle valve is set to a second predetermined opening and said air-fuel ratio is set to stoichiometric value when said high state is set, and said first predetermined opening is less than said second predetermined opening.
Claim 37
Dependent Claim
26 words
The system of claim 19, wherein said control means sets a target engine speed and a target mean effective pressure as said target engine operating state.
Claim 38
Dependent Claim
40 words
The system of claim 34, wherein said control means sets a target throttle value opening based on said target engine speed and said target mean effective pressure, and controls said internal combustion engine based on said target throttle value opening.
Claim 39
Independent Claim
256 words
A system for operating a hybrid car, said hybrid car including an electric motor for driving said hybrid car, a battery for supplying electric power to said electric motor, a generator for charging said battery, an internal combustion engine operatively isolated from said electric motor and used to drive said generator, and an exhaust gas purifier with a catalyst for purifying exhaust gas from said internal combustion engine, the system comprising: at least first and second sensors for sensing first and second vehicle operating parameters, respectively, at least one of said at least first and second sensors detecting a parameter other than a depression degree of an accelerator pedal and a depression of a brake pedal; a battery charge sensor for sensing a charge of said battery; and control means for controlling said electric motor based on at least said first and second vehicle operating parameters, for determining a charge state of said battery, for setting a target engine operating state in accordance with at least said charge state, and for controlling said internal combustion engine to achieve said target engine operating state; a temperature sensor for sensing a temperature of said catalyst; and wherein said control means determines whether said catalyst is in one of a sufficiently heated state and an insufficiently heated state based on output of said temperature sensor; and wherein said control means sets said target engine operating state to an off state such that said control means prohibits said internal combustion engine from operating when said insufficiently heated state is determined.
Claim 40
Independent Claim
256 words
A system for operating a hybrid car, said hybrid car including an electric motor for driving said hybrid car, a battery for supplying electric power to said electric motor, a generator for charging said battery, an internal combustion engine operatively isolated from said electric motor and used to drive said generator, and an exhaust gas purifier with a catalyst for purifying exhaust gas from said internal combustion engine, the system comprising: at least first and second sensors for sensing first and second vehicle operating parameters, respectively, at least one of said at least first and second sensors detecting a parameter other than a depression degree of an accelerator pedal and a depression of a brake pedal; a battery charge sensor for sensing a charge of said battery; and control means for controlling said electric motor based on at least said first and second vehicle operating parameters, for determining a charge state of said battery, for setting a target engine operating state in accordance with at least said charge state, and for controlling said internal combustion engine to achieve said target engine operating state; a temperature sensor for sensing a temperature of said catalyst; and wherein said control means determines whether said catalyst is in one of a sufficiently heated state and an insufficiently heated state based on output of said temperature sensor; and wherein said control means sets said target engine operating state to an off state such that said control means prohibits said internal combustion engine from operating when said insufficiently heated state is determined.
Claim 41
Independent Claim
150 words
A method for operating a hybrid car comprising: providing an electric motor to drive driving wheels of said hybrid car; providing a battery to supply electrical power to said electric motor; providing a generator to charge said battery, said generator being provided independently from said electric motor; providing an internal combustion engine to drive said generator, said internal combustion engine driving said generator without providing output torque to said motor; sensing, with a first sensor, an actual vehicle velocity; sensing, with a second sensor, a depression degree of an accelerator pedal to establish a predetermined target vehicle velocity; controlling said electric motor based on said sensed actual vehicle velocity and said established predetermined target vehicle velocity; determining a charge state of said battery; setting a target engine operating state in accordance with at least said charge state; and controlling said internal combustion engine to achieve said target engine operating state.
Claim 42
Independent Claim
150 words
A method for operating a hybrid car comprising: providing an electric motor to drive driving wheels of said hybrid car; providing a battery to supply electrical power to said electric motor; providing a generator to charge said battery, said generator being provided independently from said electric motor; providing an internal combustion engine to drive said generator, said internal combustion engine driving said generator without providing output torque to said motor; sensing, with a first sensor, an actual vehicle velocity; sensing, with a second sensor, a depression degree of an accelerator pedal to establish a predetermined target vehicle velocity; controlling said electric motor based on said sensed actual vehicle velocity and said established predetermined target vehicle velocity; determining a charge state of said battery; setting a target engine operating state in accordance with at least said charge state; and controlling said internal combustion engine to achieve said target engine operating state.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2001-07-27 | 2002-01-26 | 2002-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-07-27 | 2006-01-26 | 2006-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-07-27 | 2010-01-26 | 2010-07-28 | $7700.00 | Window Closed / Lapsed |