US3895541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for motor vehicle with catalytic convertor and automatic power transmission mechanism
Assignee: Toyota Motor Corp
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Filing: 1973-06-15
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Granted: 1975-07-22
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Expires: 1993-06-15
Abstract
Abstract A control system is provided for a motor vehicle including a catalytic convertor for purifying engine exhaust gases and an automatic power transmission mechanism controlled by an oil pressure system. The control system of the invention operates in conjunction with the oil pressure control system of the automatic transmission to sense engine exhaust gas temperature and to delay upshift of the automatic transmission until a desired temperature of the engine exhaust gases is achieved.
Inventors
- 👤 Hidetaka Nohira
- 👤 Shin Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:39
CPC Classifications
B; B60; B60K; B60K23/00; F; F16; F16H; F16H59/00; F16H59/74; F16H59/78; F16H61/00; F16H2061/0018; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0206; F16H61/0213
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
206 words
In a motor vehicle including an engine, an automatic power transmission mechanism for transmitting power from said engine to drive said vehicle, an engine exhaust gas system having a catalytic convertor including a catalyst for purifying exhaust gases from said engine, and an oil pressure system for controlling operation of said automatic transmission mechanism to selectively provide a plurality of forward driving speed ratios, the improvement consisting of a control system for expediting temperature rise of said catalyst, said control system comprising; shift means operatively associated with said oil pressure system for effecting shift control operation of said transmission mechanism from a lower to a higher driving speed ratio; sensing means connected for sensing temperature indicative of the temperature of exhaust gases within said catalytic convertor; delay means responsive to said sensing means and connected to control said shift means in accordance with the temperature of said exhaust gases in said catalytic converter to prevent operation thereof to shift said transmission from said lower to said higher driving speed ratio when the temperature sensed by said sensing means indicates a catalyst temperature below a predetermined level; whereby upshift of said transmission to said higher driving speed ratio is delayed until said predetermined temperature level is reached.
Claim 2
Dependent Claim
206 words
In a motor vehicle including an engine, an automatic power transmission mechanism for transmitting power from said engine to drive said vehicle, an engine exhaust gas system having a catalytic convertor including a catalyst for purifying exhaust gases from said engine, and an oil pressure system for controlling operation of said automatic transmission mechanism to selectively provide a plurality of forward driving speed ratios, the improvement consisting of a control system for expediting temperature rise of said catalyst, said control system comprising; shift means operatively associated with said oil pressure system for effecting shift control operation of said transmission mechanism from a lower to a higher driving speed ratio; sensing means connected for sensing temperature indicative of the temperature of exhaust gases within said catalytic convertor; delay means responsive to said sensing means and connected to control said shift means in accordance with the temperature of said exhaust gases in said catalytic converter to prevent operation thereof to shift said transmission from said lower to said higher driving speed ratio when the temperature sensed by said sensing means indicates a catalyst temperature below a predetermined level; whereby upshift of said transmission to said higher driving speed ratio is delayed until said predetermined temperature level is reached.
Claim 3
Dependent Claim
106 words
A system according to claim 1 wherein said oil pressure system includes supply means for providing to said system oil under pressure, said oil pressure system further including an oil supply circuit for supplying said oil to said shift means, said shift means including a valve mechanism operable to effect said shift control operation of said transmission in accordance with the supply of oil thereto, and wherein said delay means comprise a valve mechanism located in said oil supply circuit and operable in response to said sensing means to open and close said oil supply circuit thereby to control supply of oil to said shift means.
Claim 4
Dependent Claim
70 words
A system according to claim 2 wherein said shift means operates to effect shifting of said transmission from said lower to said higher driving speed ratio when oil is supplied thereto through said oil supply circuit, and wherein said delay means operate to maintain said oil supply circuit closed thereby preventing oil supply to said shift means when the temperature sensed by said sensing means is below said predetermined level.
Claim 5
Dependent Claim
98 words
A system according to claim 3 wherein said delay means valve mechanism comprises spring means biaSing said valve mechanism to close said oil supply circuit, conduit means supplying pressurized oil to said valve mechanism to overcome the biasing action of said spring means thereby to open said oil supply circuit, and means responsive to said sensing means for venting said conduit means to release said oil supplied to said valve mechanism when the temperature sensed by said sensing means is below said predetermined level thereby to permit said spring means to effect closure of said oil supply circuit.
Claim 6
Dependent Claim
94 words
A system according to claim 4 wherein said venting means comprise a solenoid having a movable armature, and port means located to be opened and closed by said armature, said port means being located in said conduit means to effect said venting of said conduit means when in the opened condition, and wherein said sensing means comprise thermally responsive electrical means controlling operation of said solenoid in accordance with the temperature of said catalyst to drive said armature to open said port means when the temperature of said catalyst is below said predetermined level.
Claim 7
Dependent Claim
181 words
A system according to claim 1 wherein said oil pressure system includes means for supplying oil under pressure to said shift means in dependence upon the speed of said vehicle, with said shift means including a first valve spool movable to effect said shift control operation of said transmission in accordance with the supply of oil thereto, and wherein said delay means include a second valve spool located adjacent said first valve spool and movable in accordance with supply of oil thereto to a position restraining movement of said first valve spool, said system further including means responsive to said sensing means for controlling oil supply to said second valve spool in accordance with the temperature sensed by said sensing means, said sensing means being operative to effect supply of oil to said second valve spool when said sensed temperature is below said predetermined level thereby moving said second valve spool to a position restricting movement of said first valve spool whereby said first valve spool is thereby biased to effect said shift control operation at a higher level vehicle speed.
Claim 8
Dependent Claim
109 words
A system according to claim 6 wherein said means controlling oil supply to said second valve spool comprise a solenoid including a movable armature, port means located to be opened and closed by said armature and operative to vent oil supply to said second valve spool when in the opened condition, and wherein said sensing means include thermally responsive electrical means operative to control said solenoid to effect closing of said port means when the temperature sensed by said sensing means is below said predetermined level thereby to effect oil supply to said second valve spool positioning said second valve spool to restrict movement of said first valve spool.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |