EP0441961A1
Expired / Lapsed
EP
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Vehicle engine control unit
Assignee: Mitsubishi Motors Corp
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Filing: 1988-12-24
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Granted: —
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Expires: 2008-12-24
Abstract
Abstract This invention relates to a vehicle engine control unit suitable for use in an automobile. When driving state switching means (202) outputs a constant speed driving designation signal, target torque calculation means (205) calculates a target output torque of an engine (13) of a vehicle in accordance with a target vehicle speed and when driving state switching means (202) outputs an acceleration driving designation signal, the target torque calculation means (205) calculates a target output torque of the engine (13) in accordance with a target acceleration, while engine output torque detection means (208) calculates and outputs, as an actually measured value of the output of the engine (13), an output torque of a torque convertor (207) on the basis of the characteristics of the convertor (207) and on the basis of the engine revolution detection signal detected by engine revolution detection means (206). Controlled variable setting means (210) sets the controlled variable of engine output regulation means (209) so that the engine output torque detected by the engine output torque detectionmeans (208) is equal to the target torque. Accordingly, the engine output regulation means (209) regulates the output of the engine (13) according to the control of the engine output control means (211) on the basis of this controlled variable. Since the target output torque of the engine (13) is set and the engine (13) is controlled so as to bring the actual torque close to this target output torque, suitable control can be accomplished.
Inventors
- 👤 Katsuo Akishino
- 👤 Nishishinbayashi-Cho 1-Chome Hirako Osamu 11-1
- 👤 Makoto Shimada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 00:56
CPC Classifications
B; B60; B60K; B60K31/00; B60K31/02; B60K31/04; B60K31/042; B60K31/06; B60K31/08; B60K31/10; B60W; B60W2510/00; B60W2510/06; B60W2510/0638; B60W2510/10; B60W2510/1015; B60W2540/00; B60W2540/10; B60W2720/00; B60W2720/10; B60W2720/106
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
352 words
An engine controlling system for a vehicle, characterized by a running speed detecting means (201) for detecting a running speed of said vehicle to develop a running speed detection signal, a running condition change-over means (202) for alternatively developing one of a constant speed running designating signal which designates constant speed running as an aimed running condition of said vehicle and an accelerated running designating signal which designates accelerated running as the aimed running condition, an aimed speed setting means (203) for setting, when the constant speed running designating signal is received, an aimed speed at which said vehicle should make constant speed running, an aimed acceleration setting means (204) for setting, when the accelerated running designating signal is received, an aimed acceleration with which said vehicle should make accelerated running, an aimed torque calculating means (205) for calculating, when the constant speed running designating signal is received, an aimed output torque of an engine (13) of said vehicle in accordance with the aimed speed but calculating, when the accelerated running designating signal is received, an aimed output torque of said engine (13) in accordance with the aimed acceleration, an engine rotational speed detecting means (206) for detecting a speed of rotation of said engine (13) to develop an engine rotational speed detection signal, a torque converter (207) provided between said engine (13) and a transmission (212), an engine output torque detecting means (208) for developing, as a measured value of an output power of said engine (13), an output torque of said torque converter (207) calculated from the engine rotational speed detection signal and a value preset in accordance with characteristics of said converter (207), an engine output adjusting means (209) for adjusting the output power of said engine (13), a control amount setting means (210) for setting a control amount of said engine output adjusting means (209) so that the engine output torque detected by said engine output torque detecting means (208) may be equal to the aimed torque, and an engine output controlling means (211) for controlling said engine output adjusting means (209) in accordance with the control amount.
Claim 2
Dependent Claim
290 words
An engine controlling system for a vehicle as set forth in claim 1, characterized in that said engine output detecting means (208) includes an input shaft rotational speed detecting means (22a) for detecting a speed of rotation of an input shaft of said torque converter (207), an output shaft rotational speed detecting section (22) for detecting a speed of rotation of an output shaft of said torque converter (207), a speed ratio calculating section (213) for calculating a ratio between the input shaft rotational speed and the output shaft rotational speed as a speed ratio, a torque capacity coefficient setting section (214) for reading out and setting, as a torque capacity coefficient C, a value corresponding to the speed ratio at present from among values which are preset in accordance with the characteristics of said torque converter (207) using the speed ratio as a parameter, a torque ratio setting section (215) for storing in advance therein torque ratios which represent ratios between absorbed torque values and output torque values of said torque converter (207) using the speed ratio as a parameter and for reading out and setting one t of the torque ratios corresponding to the speed ratio at present, and an output torque calculating section (216) for calculating, using an engine rotational speed Ne provided by the engine rotational speed detection signal, the torque capacity coefficient C set by said torque capacity coefficient setting section (214) and the torque ratio t set by said torque ratio setting section (215), an output torque Tto of said torque converter (207) in accordance with an equation; Tto = t · C · Ne² and for outputting the output torque Tto as a measured value of the output power of said engine (13).
Claim 3
Dependent Claim
302 words
An engine controlling system for a vehicle as set forth in claim 1, characterized in that said running condition change-over means (202) includes an accelerator pedal operating condition detecting section (217) for detecting treadling and cancelling of such treadling of an accelerator pedal (27) of said vehicle and for developing, upon detection of such treadling, a treadled condition detection signal but developing, upon detection of such cancelling of treadling, a non-treadled condition detection signal, and a running condition selecting section (218) for selectively developing, when the non-treadled condition detection signal is received, either one of a constant speed running designating signal which designates constant speed running as an aimed running condition of said vehicle and an accelerated running designating signal which designates accelerated running as the aimed running condition but stopping the development of the constant speed running designating signal and the accelerated running designating signal when the treadled condition detection signal is received, and said aimed torque calculating means (205) includes a constant speed running aimed torque calculating section (219) for calculating, when the constant speed running designating signal is received, an aimed engine output torque of said vehicle necessary to make the running speed of said vehicle equal to the aimed speed, an accelerated running aimed torque calculating section (220) for calculating, when the accelerated running designating signal is received, an aimed engine output torque of said vehicle in accordance with the aimed acceleration set by said aimed acceleration setting means (204), an operation amount detecting section (221) for detecting an operation amount of said accelerator pedal (27) to develop an operation amount detection signal, and a treadled condition aimed torque calculating section (222) for calculating, when the treadled condition detection signal is received, an aimed engine output torque of said vehicle in accordance with the operation amount detection signal.
Claim 4
Dependent Claim
180 words
An engine controlling system for a vehicle as set forth in claim 3, characterized in that said running condition selecting section (218) includes a manually selecting section (218a) for manually selecting either one of constant speed running and accelerated running as an aimed running condition of said vehicle, a designating signal developing section (218b) for developing a constant speed running designating signal when constant speed running is selected by said manually selecting section (218a) but developing, when accelerated running is selected, an accelerated running designating signal, a final aimed speed setting section (218c) for setting, when the accelerated running designating signal is received, a final aimed speed for accelerated running of said vehicle, and an automatic designating signal changing over section (218d) for changing over, when an absolute value of a deviation between a running speed of said vehicle and the final aimed speed becomes smaller than a predetermined value, the output of said designating signal developing section (218b) from an accelerated running designating signal to a constant speed running designating signal in response to the running speed detection signal.
Claim 5
Dependent Claim
111 words
An engine controlling system for a vehicle as set forth in claim 3, characterized in that said constant speed running aimed torque calculating section (219) includes a constant speed running aimed acceleration setting section (219a) for setting, when the constant speed running designating signal is received, an aimed acceleration of said vehicle for making the running speed of said vehicle equal to the aimed speed in response to the running speed detection signal, and a constant speed running acceleration corresponding torque calculating section (219b) for calculating an aimed engine output torque of said vehicle in accordance with the aimed acceleration set by said constant speed running aimed acceleration setting section (219a).
Claim 6
Dependent Claim
109 words
An engine controlling system for a vehicle as set forth in claim 3, characterized in that said treadled condition aimed torque calculating section (222) includes a treadled condition aimed acceleration setting section (222a) for setting, when the treadled condition detection signal is received, an aimed acceleration in accordance with an operation amount of said accelerator pedal (27) and a changing rate of the operation amount in response to the operation amount detection signal, and a treadled condition acceleration corresponding torque calculating section (222b) for calculating an aimed engine output torque of said vehicle in accordance with the aimed acceleration set by said treadled condition aimed acceleration setting section (222a).
Claim 7
Dependent Claim
34 words
An engine controlling system for a vehicle as set forth in claim 1, characterized in that said aimed acceleration setting means (219a) is capable of setting a negative acceleration value as the aimed acceleration.
Claim 8
Dependent Claim
49 words
An engine controlling system for a vehicle as set forth in claim 1, characterized in that said engine output adjusting means (209) includes a throttle valve (31) for varying the amount of air to be taken into said engine (13) to adjust the output power of said engine (13).
References Cited (Backward Citations)
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